研究者詳細 - 大山　伸一郎

論文 - 大山　伸一郎

分割表示 >> ／全件表示 122 件中 1 - 122 件目

Multi-Event Analysis of STEVE, SAR Arc, and Red/Green Arc at Subauroral Latitudes Using Data From Ground Optical and Radio Instruments and the Arase and Van Allen Probes Satellites

Sugimura, R; Shiokawa, K; Otsuka, Y; Oyama, S; Oksanen, A; Connors, M; Kadokura, A; Poddelsky, I; Nishitani, N; Shepherd, SG; Ruohoniemi, JM; Smith, C; Spence, H; Reeves, G; Funsten, HO; Miyoshi, Y; Shinohara, I; Kasahara, Y; Tsuchiya, F; Kumamoto, A; Shinbori, A; Asamura, K; Yokota, S; Kazama, Y; Jun, CW; Wang, SY; Tam, SWY; Chang, TF; Wang, BJ; Kasahara, S; Keika, K; Hori, T; Matsuoka, A

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 130 巻 ( 2 ) 2025年2月

Total Electron Content Variations During an HSS/SIR-Driven Geomagnetic Storm at High and Mid Latitudes

Geethakumari, GP; Aikio, AT; Cai, L; Vanhamäki, H; Virtanen, II; Coster, A; Marchaudon, A; Blelly, PL; Maute, A; Norberg, J; Oyama, S; Zhang, Y; Kunduri, BSR

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 129 巻 ( 12 ) 2024年12月

Development and Evaluation of a Comprehensive Machine Learning Tool Differentiating Idiopathic Pulmonary Fibrosis from Other Interstitial Lung Diseases in the Japanese nationwide registry (PROMISE study)

Furukawa, T; Kondoh, Y; Oyama, S; Yokota, H; Teramachi, R; Hozumi, H; Shiratori, Y; Hasegawa, Y; Suda, T; Ishii, M

EUROPEAN RESPIRATORY JOURNAL 64 巻 2024年9月

EISCAT Observations of Depleted High-Latitude <i>F</i>-Region During an HSS/SIR-Driven Magnetic Storm

Ellahouny, NM; Aikio, AT; Vanhamäki, H; Virtanen, II; Cai, L; Marchaudon, A; Blelly, PL; Coster, A; Norberg, J; Maute, A; Oyama, S

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 129 巻 ( 9 ) 2024年9月

Observational Evidence for Three Time-Scale Modulations in the Pulsating Aurora

Chen, R; Miyoshi, Y; Gao, XL; Lu, QM; Tsurutani, BT; Hosokawa, K; Hori, T; Ogawa, Y; Oyama, SI; Kasahara, Y; Matsuda, S; Nakamura, S; Matsuoka, A; Shinohara, I

GEOPHYSICAL RESEARCH LETTERS 51 巻 ( 16 ) 2024年8月

Effect of Polar Cap Patches on the High-Latitude Upper Thermospheric Winds

Cai, L; Aikio, A; Oyama, S; Ivchenko, N; Vanhamäki, H; Virtanen, I; Buchert, S; Mekuriaw, ML; Zhang, Y

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 129 巻 ( 8 ) 2024年8月

Occurrence of Mesospheric Frontal Structures Over the High Latitude Station, Tromsø, Norway

Chauhan, N; Shiokawa, K; Gurubaran, S; Nozawa, S; Oyama, SI; Nakamura, T

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 129 巻 ( 7 ) 2024年7月

Spatiotemporal Development of Cosmic Noise Absorption at Subauroral Latitudes Using Multipoint Ground-Based Riometers

Kato, Y; Shiokawa, K; Tanaka, Y; Ozaki, M; Kadokura, A; Oyama, S; Oinats, A; Connors, M; Baishev, D

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 129 巻 ( 7 ) 2024年7月

On the Factors Controlling the Relationship Between Type of Pulsating Aurora and Energy of Pulsating Auroral Electrons: Simultaneous Observations by Arase Satellite, Ground-Based All-Sky Imagers and EISCAT Radar

Ito, Y; Hosokawa, K; Ogawa, Y; Miyoshi, Y; Tsuchiya, F; Fukizawa, M; Kasaba, Y; Kazama, Y; Oyama, S; Murase, K; Nakamura, S; Kasahara, Y; Matsuda, S; Kasahara, S; Hori, T; Yokota, S; Keika, K; Matsuoka, A; Teramoto, M; Shinohara, I

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 129 巻 ( 7 ) 2024年7月

Westward Excursion of Pc1/EMIC Waves and Their Source Protons: Paradoxical Observations From Ground and Space

Yin, ZF; Zhou, XZ; Hu, ZJ; Yue, C; Zong, QG; Liu, ZY; Liu, JJ; Shiokawa, K; Oyama, SI; Baishev, D

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 129 巻 ( 5 ) 2024年5月

Statistical Analysis of Low-Latitude Boundary of Polar-Type Medium-Scale Traveling Ionospheric Disturbances Observed by a 630-nm Airglow Imager at Nyrölä, Finland

Sato, M; Shiokawa, K; Oyama, S; Otsuka, Y; Shinbori, A; Oksanen, A

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 129 巻 ( 4 ) 2024年4月

Thermospheric Wind Response to March 2023 Storm: Largest Wind Ever Observed With a Fabry-Perot Interferometer in Tromsø, Norway Since 2009

Oyama, S; Vanhamäki, H; Cai, L; Shinbori, A; Hosokawa, K; Sakanoi, T; Shiokawa, K; Aikio, A; Virtanen, II; Ogawa, Y; Miyoshi, Y; Kurita, S; Nishitani, N

SPACE WEATHER-THE INTERNATIONAL JOURNAL OF RESEARCH AND APPLICATIONS 22 巻 ( 3 ) 2024年3月

Longitudinal Development of Cosmic Noise Absorption Based on Multipoint Observations at Subauroral Latitudes During Storm-Time Substorms on 25-28 August 2018

Kato, Y; Shiokawa, K; Tanaka, Y; Ozaki, M; Kadokura, A; Oyama, SI; Oinats, A; Connors, M; Baishev, D

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 129 巻 ( 1 ) 2024年1月

Correspondence of Pi2 Pulsations, Aurora Luminosity, and Plasma Flux Fluctuation Near a Substorm Brightening Aurora: Arase Observations

Chen, L; Shiokawa, K; Miyoshi, Y; Oyama, S; Jun, CW; Ogawa, Y; Hosokawa, K; Kazama, Y; Wang, SY; Tam, SWY; Chang, TF; Wang, BJ; Asamura, K; Kasahara, S; Yokota, S; Hori, T; Keika, K; Kasaba, Y; Kumamoto, A; Tsuchiya, F; Shoji, M; Kasahara, Y; Matsuoka, A; Shinohara, I; Nakamura, S

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 128 巻 ( 10 ) 2023年10月

An Implication of Detecting the Internal Modulation in a Pulsating Aurora: A Conjugate Observation by the Arase Satellite and All-Sky Imagers

Nanjo S., Ebukuro S., Nakamura S., Miyoshi Y., Kurita S., Oyama S. -I., Ogawa Y., Keika K., Kasahara Y., Kasahara S., Matsuoka A., Hori T., Yokota S., Matsuda S., Shinohara I., Wang S. -Y., Kazama Y., Jun C. -W., Kitahara M., Hosokawa K.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 128 巻 ( 8 ) 2023年8月

A Ground-Based Instrument Suite for Integrated High-Time Resolution Measurements of Pulsating Aurora With Arase

Hosokawa K., Oyama S. -I., Ogawa Y., Miyoshi Y., Kurita S., Teramoto M., Nozawa S., Kawabata T., Kawamura Y., Tanaka Y. -M., Miyaoka H., Kataoka R., Shiokawa K., Brandstrom U., Turunen E., Raita T., Johnsen M. G., Hall C., Hampton D., Ebihara Y., Kasahara Y., Matsuda S., Shinohara I., Fujii R.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 128 巻 ( 8 ) 2023年8月

IMF Dependence of Midnight Bifurcation in the Thermospheric Wind at an Auroral Latitude Based on Nine Winter Measurements in Tromso, Norway

Oyama S., Hosokawa K., Vanhamaki H., Aikio A., Sakanoi T., Cai L., Virtanen I. I., Shiokawa K., Nishitani N., Shinbori A., Ogawa Y.

GEOPHYSICAL RESEARCH LETTERS 50 巻 ( 14 ) 2023年7月

Geomagnetic activity dependence and dawn-dusk asymmetry of thermospheric winds from 9-year measurements with a Fabry-Perot interferometer in Tromso, Norway

Oyama Shin-ichiro, Aikio Anita, Sakanoi Takeshi, Hosokawa Keisuke, Vanhamaki Heikki, Cai Lei, Virtanen Ilkka, Pedersen Marcus, Shiokawa Kazuo, Shinbori Atsuki, Nishitani Nozomu, Ogawa Yasunobu

EARTH PLANETS AND SPACE 75 巻 ( 1 ) 2023年5月

Ionospheric modulation by EMIC wave-driven proton precipitation: Observations and simulations 招待有り査読有り国際共著

(101) Tian, X., Y. Yu, F. Gong, L. Ma, J. Cao, S. C. Solomon, P. R. Shreedevi, K. Shiokawa, Y. Otsuka, S. Oyama, Y. Miyoshi

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2023年1月

Multi-event analysis of magnetosphere-ionosphere coupling of nighttime medium-scale traveling ionospheric disturbances from the ground and the Arase satellite 招待有り査読有り

(100) Kawai, K., K. Shiokawa, Y. Otsuka, S. Oyama, M. G. Connors, Y. Kasahara, Y. Kasaba, S. Nakamura, F. Tsuchiya, A. Kumamoto, A. Shinbori, A. Matsuoka, I. Shinohara, and Y. Miyoshi

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2023年1月

A statistical study of longitudinal extent of Pc1 pulsations using seven PWING ground stations at subauroral latitudes 招待有り査読有り

(99) Liu, J., K. Shiokawa, S. Oyama, Y. Otsuka, C. W. Jun, M. Nose, T. Nagatsuma, K. Sakaguchi, A. Kadokura, M. Ozaki, M. Connors, D. Baishev, N. Nishitani, A. Oinats, V. Kurkin and T. Raita

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2023年1月

Plasma-neutral gas interactions in various space environments: Assessment beyond simplified approximations as a Voyage 2050 theme

Yamauchi Masatoshi, De Keyser Johan, Parks George, Oyama Shin-ichiro, Wurz Peter, Abe Takumi, Beth Arnaud, Daglis Ioannis A., Dandouras Iannis, Dunlop Malcolm, Henri Pierre, Ivchenko Nickolay, Kallio Esa, Kucharek Harald, Liu Yong C-M, Mann Ingrid, Marghitu Octav, Nicolaou Georgios, Rong Zhaojin, Sakanoi Takeshi, Saur Joachim, Shimoyama Manabu, Taguchi Satoshi, Tian Feng, Tsuda Takuo, Tsurutani Bruce, Turner Drew, Ulich Thomas, Yau Andrew, Yoshikawa Ichiro

EXPERIMENTAL ASTRONOMY 54 巻 ( 2-3 ) 頁： 521 - 559 2022年12月

Thermospheric wind response to a sudden ionospheric variation in the trough: event at a pseudo-breakup during geomagnetically quiet conditions 査読有り国際共著

Oyama, Si., Vanhamäki, H., Cai, L. et al.

Earth, Planets and Space 74 巻 ( 154 ) 2022年10月

Observation of Source Plasma and Field Variations of a Substorm Brightening Aurora at L similar to 6 by a Ground-Based Camera and the Arase Satellite on 12 October 2017

Chen L., Shiokawa K., Miyoshi Y., Oyama S., Jun C-W, Ogawa Y., Hosokawa K., Inaba Y., Kazama Y., Wang S. Y., Tam S. W. Y., Chang T. F., Wang B. J., Asamura K., Kasahara S., Yokota S., Hori T., Keika K., Kasaba Y., Kumamoto A., Tsuchiya F., Shoji M., Kasahara Y., Matsuoka A., Shinohara I, Imajo S., Nakamura S., Kitahara M.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 127 巻 ( 11 ) 2022年10月

Slow Contraction of Flash Aurora Induced by an Isolated Chorus Element Ranging From Lower-Band to Upper-Band Frequencies in the Source Region

Ozaki Mitsunori, Yagitani Satoshi, Shiokawa Kazuo, Tanaka Yoshimasa, Ogawa Yasunobu, Hosokawa Keisuke, Kasahara Yoshiya, Ebihara Yusuke, Miyoshi Yoshizumi, Imamura Kousuke, Kataoka Ryuho, Oyama Shin-ichiro, Chida Teppei, Kadokura Akira

GEOPHYSICAL RESEARCH LETTERS 49 巻 ( 9 ) 2022年5月

Altitude of pulsating arcs as inferred from tomographic measurements

Safargaleev Vladimir, Sergienko Tima, Hosokawa Keisuke, Oyama Shin-ichiro, Ogawa Yasunobu, Miyoshi Yoshizumi, Kurita Satoshi, Fujii Ryochi

EARTH PLANETS AND SPACE 74 巻 ( 1 ) 2022年2月

Study of an Equatorward Detachment of Auroral Arc From the Oval Using Ground-Space Observations and the BATS-R-US-CIMI Model

Yadav Sneha, Shiokawa K., Oyama S., Inaba Y., Takahashi N., Seki K., Keika K., Chang Tzu-Fang, Tam S. W. Y., Wang B. J., Kazama Y., Wang S. Y., Asamura K., Kasahara S., Yokota S., Hori T., Kasaba Y., Tsuchiya F., Kumamoto A., Shoji M., Kasahara Y., Matsuoka A., Matsuda S., Jun C. W., Imajo S., Miyoshi Y., Shinohara I

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 126 巻 ( 12 ) 2021年12月

Multipoint Measurement of Fine-Structured EMIC Waves by Arase, Van Allen Probe A, and Ground Stations

Matsuda S., Miyoshi Y., Kasahara Y., Blum L., Colpitts C., Asamura K., Kasaba Y., Matsuoka A., Tsuchiya F., Kumamoto A., Teramoto M., Nakamura S., Kitahara M., Shinohara I, Reeves G., Spence H., Shiokawa K., Nagatsuma T., Oyama S., Mann I. R.

GEOPHYSICAL RESEARCH LETTERS 48 巻 ( 23 ) 2021年11月

Simulated seasonal impact on middle atmospheric ozone from high-energy electron precipitation related to pulsating aurorae

Verronen Pekka T., Kero Antti, Partamies Noora, Szelag Monika E., Oyama Shin-Ichiro, Miyoshi Yoshizumi, Turunen Esa

ANNALES GEOPHYSICAE 39 巻 ( 5 ) 頁： 883 - 897 2021年10月

Periodicities and Colors of Pulsating Auroras: DSLR Camera Observations From the International Space Station

Nanjo Sota, Hozumi Yuta, Hosokawa Keisuke, Kataoka Ryuho, Miyoshi Yoshizumi, Oyama Shin-ichiro, Ozaki Mitsunori, Shiokawa Kazuo, Kurita Satoshi

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 126 巻 ( 10 ) 2021年10月

Isolated Proton Aurora Driven by EMIC Pc1 Wave: PWING, Swarm, and NOAA POES Multi-Instrument Observations

Kim Hyangpyo, Shiokawa Kazuo, Park Jaeheung, Miyoshi Yoshizumi, Miyashita Yukinaga, Stolle Claudia, Connor Hyunju Kim, Hwang Junga, Buchert Stephan, Kwon Hyuck-Jin, Nakamura Satoko, Nakamura Kohki, Oyama Shin-Ichiro, Otsuka Yuichi, Nagatsuma Tsutomu, Sakaguchi Kaori

GEOPHYSICAL RESEARCH LETTERS 48 巻 ( 18 ) 2021年9月

Simultaneous Pulsating Aurora and Microburst Observations With Ground-Based Fast Auroral Imagers and CubeSat FIREBIRD-II

Kawamura Miki, Sakanoi Takeshi, Fukizawa Mizuki, Miyoshi Yoshizumi, Hosokawa Keisuke, Tsuchiya Fuminori, Katoh Yuto, Ogawa Yasunobu, Asamura Kazushi, Saito Shinji, Spence Harlan, Johnson Arlo, Oyama Shin'ichiro, Brandstrom Urban

GEOPHYSICAL RESEARCH LETTERS 48 巻 ( 18 ) 2021年9月

First Simultaneous Observation of a Night Time Medium-Scale Traveling Ionospheric Disturbance From the Ground and a Magnetospheric Satellite

Kawai K., Shiokawa K., Otsuka Y., Oyama S., Kasaba Y., Kasahara Y., Tsuchiya F., Kumamoto A., Nakamura S., Matsuoka A., Imajo S., Kazama Y., Wang S-Y, Tam S. W. Y., Chang T. F., Wang B. J., Asamura K., Kasahara S., Yokota S., Keika K., Hori T., Miyoshi Y., Jun C., Shoji M., Shinohara I

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 126 巻 ( 9 ) 2021年9月

Variations in Cosmic Noise Absorption in Association With Equatorward Development of the Pulsating Auroral Patch: A Case Study to Estimate the Energy Spectra of Auroral Precipitating Electrons

Miyamoto Taishiro, Oyama Shin-ichiro, Raita Tero, Hosokawa Keisuke, Miyoshi Yoshizumi, Ogawa Yasunobu, Kurita Satoshi

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 126 巻 ( 9 ) 2021年9月

Penetration of MeV electrons into the mesosphere accompanying pulsating aurorae

Miyoshi Y., Hosokawa K., Kurita S., Oyama S. -I., Ogawa Y., Saito S., Shinohara I., Kero A., Turunen E., Verronen P. T., Kasahara S., Yokota S., Mitani T., Takashima T., Higashio N., Kasahara Y., Matsuda S., Tsuchiya F., Kumamoto A., Matsuoka A., Hori T., Keika K., Shoji M., Teramoto M., Imajo S., Jun C., Nakamura S.

SCIENTIFIC REPORTS 11 巻 ( 1 ) 2021年7月

Spatial Evolution of Wave-Particle Interaction Region Deduced From Flash-Type Auroras and Chorus-Ray Tracing

Ozaki Mitsunori, Inoue Tomohiro, Tanaka Yoshimasa, Yagitani Satoshi, Kasahara Yoshiya, Shiokawa Kazuo, Miyoshi Yoshizumi, Imamura Kousuke, Hosokawa Keisuke, Oyama Shin-ichiro, Kataoka Ryuho, Ebihara Yusuke, Ogawa Yasunobu, Kadokura Akira

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 126 巻 ( 7 ) 2021年7月

Multi-Event Analysis of Plasma and Field Variations in Source of Stable Auroral Red (SAR) Arcs in Inner Magnetosphere During Non-Storm-Time Substorms 査読有り国際共著

Inaba Yudai, Shiokawa Kazuo, Oyama Shin-ichiro, Otsuka Yuichi, Connors Martin, Schofield Ian, Miyoshi Yoshizumi, Imajo Shun, Shinbori Atsuki, Gololobov Artem Yu, Kazama Yoichi, Wang Shiang-Yu, Tam Sunny W. Y., Chang Tzu-Fang, Wang Bo-Jhou, Asamura Kazushi, Yokota Shoichiro, Kasahara Satoshi, Keika Kunihiro, Hori Tomoaki, Matsuoka Ayako, Kasahara Yoshiya, Kumamoto Atsushi, Matsuda Shoya, Kasaba Yasumasa, Tsuchiya Fuminori, Shoji Masafumi, Kitahara Masahiro, Nakamura Satoko, Shinohara Iku, Spence Harlan E., Reeves Geoff D., Macdowall Robert J., Smith Charles W., Wygant John R., Bonnell John W.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 126 巻 ( 4 ) 2021年4月

Over-Darkening of Pulsating Aurora 査読有り国際誌

Hosokawa K., Miyoshi Y., Oyama S- I, Ogawa Y., Kurita S., Kasahara Y., Kasaba Y., Yagitani S., Matsuda S., Ozaki M., Tsuchiya F., Kumamoto A., Takashima T., Shinohara I, Fujii R.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 126 巻 ( 4 ) 2021年4月

Formation of an additional density peak in the bottom side of the sodium layer associated with the passage of multiple mesospheric frontal systems 査読有り国際共著

Narayanan Viswanathan Lakshmi, Nozawa Satonori, Oyama Shin-Ichiro, Mann Ingrid, Shiokawa Kazuo, Otsuka Yuichi, Saito Norihito, Wada Satoshi, Kawahara Takuya D., Takahashi Toru

ATMOSPHERIC CHEMISTRY AND PHYSICS 21 巻 ( 4 ) 頁： 2343 - 2361 2021年2月

Study of Spatiotemporal Development of Global Distribution of Magnetospheric ELF/VLF Waves Using Ground-Based and Satellite Observations, and RAM-SCB Simulations, for the March and November 2017 Storms

Takeshita Yuhei, Shiokawa Kazuo, Miyoshi Yoshizumi, Ozaki Mitsunori, Kasahara Yoshiya, Oyama Shin-ichiro, Connors Martin, Manninen Jyrki, Jordanova Vania K., Baishev Dmitry, Oinats Alexey, Kurkin Vladimir

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 126 巻 ( 2 ) 2021年2月

OI 630.0-nm and N-2 1PG Emissions in Pulsating Aurora Events Observed by an Optical Spectrograph at Tromso, Norway 査読有り国際共著

Tsuda T. T., Li C., Hamada S., Hosokawa K., Oyama S. -I., Nozawa S., Kawabata T., Mizuno A., Kurihara J., Nishiyama T., Kosch M. J.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 125 巻 ( 12 ) 2020年12月

Relativistic Electron Microbursts as High-Energy Tail of Pulsating Aurora Electrons 査読有り

Miyoshi Y., Saito S., Kurita S., Asamura K., Hosokawa K., Sakanoi T., Mitani T., Ogawa Y., Oyama S., Tsuchiya F., Jones S. L., Jaynes A. N., Blake J. B.

GEOPHYSICAL RESEARCH LETTERS 47 巻 ( 21 ) 2020年11月

An Ephemeral Red Arc Appeared at 68 degrees MLat at a Pseudo Breakup During Geomagnetically Quiet Conditions 査読有り国際共著

Oyama S., Shinbori A., Ogawa Y., Kellinsalmi M., Raita T., Aikio A., Vanhamaeki H., Shiokawa K., Virtanen I., Cai L., Workayehu A. B., Pedersen M., Kauristie K., Tsuda T. T., Kozelov B., Demekhov A., Yahnin A., Tsuchiya F., Kumamoto A., Kasahara Y., Matsuoka A., Shoji M., Teramoto M., Lester M.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 125 巻 ( 10 ) 2020年10月

Plasma and Field Observations in the Magnetospheric Source Region of a Stable Auroral Red (SAR) Arc by the Arase Satellite on 28 March 2017 査読有り

Inaba Yudai, Shiokawa Kazuo, Oyama Shin-ichiro, Otsuka Yuichi, Oksanen Arto, Shinbori Atsuki, Gololobov Artem Yu, Miyoshi Yoshizumi, Kazama Yoichi, Wang Shiang-Yu, Tam Sunny W. Y., Chang Tzu-Fang, Wang Bo-Jhou, Yokota Shoichiro, Kasahara Satoshi, Keika Kunihiro, Hori Tomoaki, Matsuoka Ayako, Kasahara Yoshiya, Kumamoto Atsushi, Kasaba Yasumasa, Tsuchiya Fuminori, Shoji Masafumi, Shinohara Iku, Stolle Claudia

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 125 巻 ( 10 ) 2020年10月

Estimation of the emission altitude of pulsating aurora using the five-wavelength photometer 査読有り

Kawamura Yuki, Hosokawa Keisuke, Nozawa Satonori, Ogawa Yasunobu, Kawabata Tetsuya, Oyama Shin-Ichiro, Miyoshi Yoshizumi, Kurita Satoshi, Fujii Ryoichi

EARTH PLANETS AND SPACE 72 巻 ( 1 ) 2020年7月

Development of low-cost multi-wavelength imager system for studies of aurora and airglow 査読有り

Ogawa Y., Tanaka Y., Kadokura A., Hosokawa K., Ebihara Y., Motoba T., Gustaysson B., Brandstrom U., Sato Y., Oyama S., Ozaki M., Raita T., Sigernes F., Nozawa S., Shiokawa K., Kosch M., Kauristie K., Hall C., Suzuki S., Miyoshi Y., Gerrard A., Miyaoka H., Fujii R.

POLAR SCIENCE 23 巻 2020年3月

Fine-Scale Visualization of Aurora in a Wide Area Using Color Digital Camera Images From the International Space Station 査読有り

Nanjo Sota, Hozumi Yuta, Hosokawa Keisuke, Kataoka Ryuho, Miyoshi Yoshizumi, Oyama Shin-ichiro, Ozaki Mitsunori, Shiokawa Kazuo, Kurita Satoshi

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 125 巻 ( 3 ) 2020年3月

Multievent Analysis of Oscillatory Motion of Medium-Scale Traveling Ionospheric Disturbances Observed by a 630-nm Airglow Imager Over Tromso 査読有り

Yadav Sneha, Shiokawa K., Oyama S., Otsuka Y.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 125 巻 ( 3 ) 2020年3月

Multiple time-scale beats in aurora: precise orchestration via magnetospheric chorus waves 査読有り

Hosokawa K., Miyoshi Y., Ozaki M., Oyama S- I, Ogawa Y., Kurita S., Kasahara Y., Kasaba Y., Yagitani S., Matsuda S., Tsuchiya F., Kumamoto A., Kataoka R., Shiokawa K., Raita T., Turunen E., Takashima T., Shinohara I, Fujii R.

SCIENTIFIC REPORTS 10 巻 ( 1 ) 2020年2月

Potential for the measurement of mesosphere and lower thermosphere (MLT) wind, temperature, density and geomagnetic field with Superconducting Submillimeter-Wave Limb-Emission Sounder 2 (SMILES-2) 査読有り

Baron Philippe, Ochiai Satoshi, Dupuy Eric, Larsson Richard, Liu Huixin, Manago Naohiro, Murtagh Donal, Oyama Shin-ichiro, Sagawa Hideo, Saito Akinori, Sakazaki Takatoshi, Shiotani Masato, Suzuki Makoto

ATMOSPHERIC MEASUREMENT TECHNIQUES 13 巻 ( 1 ) 頁： 219 - 237 2020年1月

Diffuse and Pulsating Aurora 査読有り

Nishimura Yukitoshi, Lessard Marc R., Katoh Yuto, Miyoshi Yoshizumi, Grono Eric, Partamies Noora, Sivadas Nithin, Hosokawa Keisuke, Fukizawa Mizuki, Samara Marilia, Michell Robert G., Kataoka Ryuho, Sakanoi Takeshi, Whiter Daniel K., Oyama Shin-ichiro, Ogawa Yasunobu, Kurita Satoshi

SPACE SCIENCE REVIEWS 216 巻 ( 1 ) 2020年1月

Longitudinal Extent of Magnetospheric ELF/VLFWaves using Multipoint PWING Ground Stations at Subauroral Latitudes 査読有り

Takeshita Yuhei, Shiokawa Kazuo, Ozaki Mitsunori, Manninen Jyrki, Oyama Shin-Ichiro, Connors Martin, Baishev Dmitry, Kurkin Vladimir, Oinats Alexey

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 124 巻 ( 12 ) 頁： 9881 - 9892 2019年12月

Ground Echoes Observed by the Meteor Radar and High-Speed Auroral Observations in the Substorm Growth Phase 査読有り

Kozlovsky A., Shalimov S., Oyama S., Hosokawa K., Lester M., Ogawa Y., Hall C.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2019年11月

Ground Echoes Observed by the Meteor Radar and High-Speed Auroral Observations in the Substorm Growth Phase 査読有り

Kozlovsky A., Shalimov S., Oyama S., Hosokawa K., Lester M., Ogawa Y., Hall C.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 124 巻 ( 11 ) 頁： 9278 - 9292 2019年11月

High-latitude thermospheric wind study using a Fabry-Perot interferometer at Tromso in Norway: averages and variations during quiet times 査読有り

Xu Heqiucen, Shiokawa Kazuo, Oyama Shin-ichiro, Nozawa Satonori

EARTH PLANETS AND SPACE 71 巻 ( 1 ) 2019年10月

Thermospheric wind variations observed by a Fabry-Perot interferometer at Tromso, Norway, at substorm onsets 査読有り

Xu Heqiucen, Shiokawa Kazuo, Oyama Shin-ichiro, Otsuka Yuichi

EARTH PLANETS AND SPACE 71 巻 ( 1 ) 2019年8月

Tracking the Region of High Correlation Between Pulsating Aurora and Chorus: Simultaneous Observations With Arase Satellite and Ground-Based All-Sky Imager in Russia 査読有り

Kawamura S., Hosokawa K., Kurita S., Oyama S., Miyoshi Y., Kasahara Y., Ozaki M., Matsuda S., Matsuoka A., Kozelov B., Kawamura Y., Shinohara I

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 2019年8月

Visualization of rapid electron precipitation via chorus element wave-particle interactions 査読有り

Ozaki Mitsunori, Miyoshi Yoshizumi, Shiokawa Kazuo, Hosokawa Keisuke, Oyama Shin-ichiro, Kataoka Ryuho, Ebihara Yusuke, Ogawa Yasunobu, Kasahara Yoshiya, Yagitani Satoshi, Kasaba Yasumasa, Kumamoto Atsushi, Tsuchiya Fuminori, Matsuda Shoya, Katoh Yuto, Hikishima Mitsuru, Kurita Satoshi, Otsuka Yuichi, Moore Robert C., Tanaka Yoshimasa, Nose Masahito, Nagatsuma Tsutomu, Nishitani Nozomu, Kadokura Akira, Connors Martin, Inoue Takumi, Matsuoka Ayako, Shinohara Iku

NATURE COMMUNICATIONS 124 巻 ( 5 ) 2019年5月

A PROPOSAL FOR SATELLITE OBSERVATION OF THE WHOLE ATMOSPHERE - SUPERCONDUCTING SUBMILLIMETER-WAVE LIMB-EMISSION SOUNDER (SMILES-2) 査読有り

Shiotani M., Saito A., Sakazaki T., Ochiai S., Baron P., Nishibori T., Suzuki M., Abe T., Maezawa H., Oyama S.

2019 IEEE INTERNATIONAL GEOSCIENCE AND REMOTE SENSING SYMPOSIUM (IGARSS 2019) 124 巻 ( 5 ) 頁： 3709 - 3728 2019年5月

Tracking the Region of High Correlation Between Pulsating Aurora and Chorus: Simultaneous Observations With Arase Satellite and Ground-Based All-Sky Imager in Russia 査読有り

Kawamura S., Hosokawa K., Kurita S., Oyama S., Miyoshi Y., Kasahara Y., Ozaki M., Matsuda S., Matsuoka A., Kozelov B., Kawamura Y., Shinohara I

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 124 巻 ( 4 ) 頁： 2769 - 2778 2019年4月

Rapid Loss of Relativistic Electrons by EMIC Waves in the Outer Radiation Belt Observed by Arase, Van Allen Probes, and the PWING Ground Stations 査読有り

Kurita S., Miyoshi Y., Shiokawa K., Higashio N., Mitani T., Takashima T., Matsuoka A., Shinohara I., Kletzing C. A., Blake J. B., Claudepierre S. G., Connors M., Oyama S., Nagatsuma T., Sakaguchi K., Baishev D., Otsuka Y.

GEOPHYSICAL RESEARCH LETTERS 10 巻 ( 257 ) 2019年1月

Electrostatic Electron Cyclotron Harmonic Waves as a Candidate to Cause Pulsating Auroras 査読有り

Fukizawa M., Sakanoi T., Miyoshi Y., Hosokawa K., Shiokawa K., Katoh Y., Kazama Y., Kumamoto A., Tsuchiya F., Miyashita Y., Tanaka Y-M., Kasahara Y., Ozaki M., Matsuoka A., Matsuda S., Hikishima M., Oyama S., Ogawa Y., Kurita S., Fujii R.

GEOPHYSICAL RESEARCH LETTERS 頁： 8788 - 8791 2019年

Spatiotemporal development of pulsating auroral patch associated with discrete chorus elements: Arase and PWING observations 査読有り

Ozaki M., Shiokawa K., Miyoshi Y., Hosokawa K., Oyama S., Yagitani S., Kasahara Y., Kasaba Y., Matsuda S., Kataoka R., Ebihara Y., Ogawa Y., Otsuka Y., Kurita S., Moore R. C., Tanaka Y. -M., Nose M., Nagatsuma T., Connors M., Nishitani N., Hikishima M., Kumamoto A., Tsuchiya F., Kadokura A., Nishiyama T., Inoue T., Imamura K., Matsuoka A., Shinohara I.

2019 URSI ASIA-PACIFIC RADIO SCIENCE CONFERENCE (AP-RASC) 2019年

Height-dependent ionospheric variations in the vicinity of nightside poleward expanding aurora after substorm onset 査読有り

Oyama, S., Y. Miyoshi, K. Shiokawa, J. Kurihara, T. T. Tsuda, and B. J. Watkins

J. Geophys. Res. Space Physics 45 巻 ( 23 ) 頁： 12720 - 12729 2018年12月

Generation of atmospheric gravity waves in the polar thermosphere in response to auroral activity 査読有り

Oyama, S., and B. J. Watkins

Space Science Review 45 巻 ( 23 ) 頁： 12661 - 12668 2018年12月

Variance of the vertical ion speed measured with the EISCAT UHF radar in the polar lower ionosphere at Tromsoe, Norway 査読有り

Oyama, S., A. Brekke, T. T. Tsuda, J. Kurihara, and B. J. Watkins

J. Geophys. Res. 45 巻 ( 22 ) 頁： 12125 - 12134 2018年11月

Purple Auroral Rays and Global Pc1 Pulsations Observed at the CIR-Associated Solar Wind Density Enhancement on 21 March 2017 査読有り

Shiokawa K., Ozaki M., Kadokura A., Endo Y., Sakanoi T., Kurita S., Miyoshi Y., Oyama S. -I., Connors M., Schofield I., Ruohoniemi J. M., Nose M., Nagatsuma T., Sakaguchi K., Baishev D. G., Pashinin A., Rakhmatulin R., Shevtsov B., Poddelsky I., Engebretson M., Raita Tero, Tanaka Y. -M., Shinohara M., Teramoto M., Nomura R., Fujimoto A., Matsuoka A., Higashio N., Takashima T., Shinohara I., Albert Jay M.

GEOPHYSICAL RESEARCH LETTERS 45 巻 ( 20 ) 頁： 10819-10828 2018年10月

Auroral molecular-emission effects on the atomic oxygen line at 777.4nm 査読有り

Oyama Shin-ichiro, Tsuda Takuo T., Hosokawa Keisuke, Ogawa Yasunobu, Miyoshi Yoshizumi, Kurita Satoshi, Kero Antti E., Fujii Ryoichi, Tanaka Yoshimasa, Mizuno Akira, Kawabata Tetsuya, Gustavsson Bjorn, Leyser Thomas

EARTH PLANETS AND SPACE 70 巻 2018年10月

Survey of conditions for artificial aurora experiments by the second electron gyro-harmonic at EISCAT Tromso using dynasonde data 査読有り

Tsuda T. T., Rietveld M. T., Kosch M. J., Oyama S., Ogawa Y., Hosokawa K., Nozawa S., Kawabata T., Mizuno A.

EARTH PLANETS AND SPACE 70 巻 2018年6月

Survey of conditions for artificial aurora experiments at EISCAT Tromso using dynasonde data 査読有り

Tsuda T. T., Rietveld M. T., Kosch M. J., Oyama S., Hosokawa K., Nozawa S., Kawabata T., Mizuno A., Ogawa Y.

EARTH PLANETS AND SPACE 70 巻 2018年3月

Ground-based instruments of the PWING project to investigate dynamics of the inner magnetosphere at subauroral latitudes as a part of the ERG-ground coordinated observation network 査読有り

Shiokawa Kazuo, Katoh Yasuo, Hamaguchi Yoshiyuki, Yamamoto Yuka, Adachi Takumi, Ozaki Mitsunori, Oyama Shin-Ichiro, Nose Masahito, Nagatsuma Tsutomu, Tanaka Yoshimasa, Otsuka Yuichi, Miyoshi Yoshizumi, Kataoka Ryuho, Takagi Yuki, Takeshita Yuhei, Shinbori Atsuki, Kurita Satoshi, Hori Tomoaki, Nishitani Nozomu, Shinohara Iku, Tsuchiya Fuminori, Obana Yuki, Suzuki Shin, Takahashi Naoko, Seki Kanako, Kadokura Akira, Hosokawa Keisuke, Ogawa Yasunobu, Connors Martin, Ruohoniemi J. Michael, Engebretson Mark, Turunen Esa, Ulich Thomas, Manninen Jyrki, Raita Tero, Kero Antti, Oksanen Arto, Back Marko, Kauristie Kirsti, Mattanen Jyrki, Baishev Dmitry, Kurkin Vladimir, Oinats Alexey, Pashinin Alexander, Vasilyev Roman, Rakhmatulin Ravil, Bristow William, Karjala Marty

EARTH PLANETS AND SPACE 69 巻 2017年11月

Simultaneous FPI and TMA Measurements of the Lower Thermospheric Wind in the Vicinity of the Poleward Expanding Aurora After Substorm Onset 査読有り

Oyama Shin-ichiro, Kubota Ken, Morinaga Takatoshi, Tsuda Takuo T., Kurihara Junichi, Larsen Miguel F., Yamamoto Masayuki, Cai Lei

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 122 巻 ( 10 ) 頁： 10864-10875 2017年10月

Energetic electron precipitation and auroral morphology at the substorm recovery phase 査読有り

Oyama S., Kero A., Rodger C. J., Clilverd M. A., Miyoshi Y., Partamies N., Turunen E., Raita T., Verronen P. T., Saito S.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 122 巻 ( 6 ) 頁： 6508-6527 2017年5月

Measurement of thermospheric temperatures using OMTI Fabry-Perot interferometers with 70-mm etalon 査読有り

Nakamura Y., Shiokawa K., Otsuka Y., Oyama S., Nozawa S., Komolmis T., Komonjida S., Neudegg Dave, Yuile Colin, Meriwether J., Shinagawa H., Jin H.

EARTH PLANETS AND SPACE 69 巻 2017年4月

Mesospheric ozone destruction by high-energy electron precipitation associated with pulsating aurora 査読有り

Turunen, E., A. Kero, P. T. Verronen, Y. Miyoshi, S.-I. Oyama, and S. Saito

J. Geophys. Res. Atmos. 2016年9月

Thermospheric Nocturnal Wind Climatology Observed by Fabry-Perot Interferometers over the Asia-Oceania Region 査読有り

Yatagai, A., and S. Oyama

J. Meteorol. Soc. Japan 2016年8月

Lower thermospheric wind variations in auroral patches during the substorm recovery phase 査読有り

Shin-ichiro Oyama, Kazuo Shiokawa, Yoshizumi Miyoshi, Keisuke Hosokawa, Brenton J. Watkins, Junichi Kurihara, Takuo T. Tsuda andChristopher T. Fallen

J. Geophys. Res., Space Physics 121 巻 ( 4 ) 頁： 3564-3577 2016年5月

Relation between fine structure of energy spectra for pulsating aurora electrons and frequency spectra of whistler mode chorus waves 査読有り

Miyoshi, Y., S. Saito, K. Seki, T. Nishiyama, R. Kataoka, K. Asamura, Y. Katoh, Y. Ebihara, T. Sakanoi, M. Hirahara, S. Oyama, S. Kurita, and O. Santolik

J. Geophys. Res. Space Physics 2015年8月

A case study on generation mechanisms of a sporadic sodium layer above Tromsoe (69.6N) during a night of high auroral activity 査読有り

Takahashi, T., Nozawa, S., Tsuda, T. T., Ogawa, Y., Saito, N., Hidemori, T., Kawahara, T. D., Hall, C., Fujiwara, H., Matuura, N., Brekke, A., Tsutsumi, M., Wada, S., Kawabata, T., Oyama, S., and Fujii, R

Ann. Geophys. 2015年8月

Statistical study of auroral fragmentation into patches 査読有り

Hashimoto, A., K. Shiokawa, Y. Otsuka, S.-i. Oyama, S. Nozawa, T. Hori, M. Lester, and M. G. Johnsen

J. Geophys. Res. Space Physics 2015年7月

Energetic electron precipitation associated with pulsating aurora: EISCAT and Van Allen Probe observations 査読有り

Miyoshi, Y., S. Oyama, S. Saito, S. Kurita, H. Fujiwara, R. Kataoka, Y. Ebihara, C. Kletzing, G. Reeves, O. Santolik, M. Cliverd, C. J. Rodger, E. Turunen, and F. Tsuchiya

J. Geophys. Res. Space Physics 2015年3月

Approximate forms of daytime ionospheric conductance 査読有り

Ieda, A., S. Oyama, H. Vanhamäki, R. Fujii, A. Nakamizo, O. Amm, T. Hori, M. Takeda, G. Ueno, A. Yoshikawa, R. J. Redmon, W. F. Denig, Y. Kamide, and N. Nishitani

J. Geophys. Res. Space Physics 2014年11月

A case study of gravity wave dissipation in the polar MLT region using sodium LIDAR and radar data 査読有り

Takahashi, T., S. Nozawa, M. Tsutsumi, C. Hall, S. Suzuki, T. T. Tsuda, T. D. Kawahara, N. Saito, S. Oyama, S. Wada, T. Kawabata, H. Fujiwara, A. Brekke, A. Manson, C. Meek, and R. Fujii

Ann. Geophys. 2014年10月

Auroral fragmentation into patches 査読有り

Shiokawa, K., A. Hashimoto, T. Hori, K. Sakaguchi, Y. Ogawa, E. Donovan, E. Spanswick, M. Connors, Y. Otsuka, S. Oyama, S. Nozawa, and K. McWilliams

J. Geophys. Res. Space Physics 2014年9月

Height‐dependent ionospheric variations in the vicinity of nightside poleward expanding aurora after substorm onset 査読有り

Oyama, S., Y. Miyoshi, K. Shiokawa, J. Kurihara, T. T. Tsuda, and B. J. Watkins

119 巻 2014年5月

Decrease in sodium density observed during auroral particle precipitation over Tromsoe, Norway 査読有り

Tsuda, T., S. Nozawa, T. D. Kawahara, T. Kawabata, N. Saito, S. Wada, Y. Ogawa, S. Oyama, C. M. Hall, M. Tsutsumi, M. K. Ejiri, S. Suzuki, T. Takahashi, T. Nakamura

Geophys. Res. Let. 2013年8月

Observation of nighttime medium-scale travelling ionospheric disturbances by two 630-nm airglow imagers near the auroral zone 査読有り

Shiokawa, K., M. Mori, Y. Otsuka, S. Oyama, S. Nozawa, S. Suzuki, and M. Connors

J. Atmos. Solar-Terr. Phys. 2013年4月

Estimation of the layered ionospheric conductance using data from a multi-wavelength photometer at the European Incoherent Scatter (EISCAT) radar site 査読有り

Oyama, S., T. Watanabe, R. Fujii, S. Nozawa1, and T. T. Tsuda

Antarctic Record 57 巻 ( 3 ) 頁： 339-356 2013年

Development of low-cost sky-scanning Fabry-Perot interferometers for airglow and auroral studies 査読有り

Shiokawa, K., Y. Otsuka, S. Oyama, S. Nozawa, M. Satoh, Y. Katoh, Y. Hamaguchi, Y. Yamamoto, and J. Meriwether

Earth Planets Space 2012年11月

Motion of high-latitude nighttime medium-scale traveling ionospheric disturbances associated with auroral brightening 査読有り

Shiokawa, K., M. Mori, Y. Otsuka, S. Oyama, and S. Nozawa

J. Geophys. Res. 2012年10月

Mean winds, tides, and quasi-2 day waves above Bear Island 査読有り

Nozawa, S., C. M. Hall, M. Tsutsumi, A. Brekke, Y. Ogawa, T. T. Tsuda, S. Oyama, and R. Fujii

J. Atmos. Solar-Terr. Phys. 2012年5月

Temporal variations of the ion-neutral collision frequency from EISCAT observations in the polar lower ionosphere during periods of geomagnetic disturbances 査読有り

Oyama, S., J. Kurihara, B. J. Watkins, T. T. Tsuda, and T. Takahashi

J. Geophys. Res. 117 巻 ( A05308 ) 2012年3月

Generation of atmospheric gravity waves in the polar thermosphere in response to auroral activity 査読有り

Oyama, S., and B. J. Watkins

Space Science Review 2011年10月

Fine structure of sporadic sodium layer observed with a sodium lidar at Tromsoe, Norway 査読有り

Tsuda, T. T., S. Nozawa, T. Kawahara, T. Kawabata, N. Saito, S. Wada, C. Hall, S. Oyama, Y. Ogawa, S. Suzuki, T. Ogawa, T. Takahashi, H. Fujiwara, R. Fujii, N. Matuura, and A. Brekke

Geophys. Res. Lett. 2011年9月

Variance of the vertical ion speed measured with the EISCAT UHF radar in the polar lower ionosphere at Tromsoe, Norway 査読有り

Oyama, S., A. Brekke, T. T. Tsuda, J. Kurihara, and B. J. Watkins

J. Geophys. Res. 116 巻 ( A00K06 ) 2011年7月

Lower-thermospheric wind fluctuations measured with an FPI during pulsating aurora at Tromsø, Norway 査読有り

S. Oyama, K. Shiokawa, J. Kurihara, T. T. Tsuda, S. Nozawa, Y. Ogawa, Y. Otsuka, and B. J. Watkins

Ann. Geophysicae 28 巻頁： 1847-1857 2010年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

Simultaneous observations were conducted with a Fabry-Perot Interferometer (FPI) at a wavelength of 557.7 nm, an all-sky camera at a wavelength of 557.7 nm, and the European Incoherent Scatter (EISCAT) UHF radar during the Dynamics and Energetics of the Lower Thermosphere in Aurora 2 (DELTA-2) campaign in January 2009. This paper concentrated on two events during periods of pulsating aurora. The lower-thermospheric wind velocity measured with the FPI showed obvious fluctuations in both vertical and horizontal components. Of particular interest is that the location of the fluctuations was found in a darker area that appeared within the pulsating aurora. During the same time period, the EISCAT radar observed sporadic enhancements in the F-region backscatter echo power, which suggests the presence of low-energy electron (1 keV or lower) precipitation coinciding with increase in amplitude of the electromagnetic wave (at the order of 10 Hz or higher). While we have not yet identified the dominant mechanism causing the fluctuations in FPI-derived wind velocity during the pulsating aurora, the frictional heating energy dissipated by the electric-field perturbations may be responsible for the increase in ionospheric thermal energy thus modifying the local wind dynamics in the lower thermosphere.

DOI： 10.5194/angeo-28-1847-2010

Tidal waves in the polar lower thermosphere observed using the EISCAT long run data set obtained in September 2005 査読有り

Nozawa, S., Y. Ogawa, S. Oyama, H. Fujiwara, T. Tsuda, A. Brekke, C. M. Hall, Y. Murayama, S. Kawamura, H. Miyaoka, and R. Fujii

J. Geophy. Res. 2010年8月

Links between a stratospheric sudden warming and thermal structures and dynamics in the high-latitude mesosphere, lower thermosphere, and ionosphere 査読有り

Kurihara, J., Y. Ogawa, S. Oyama, S. Nozawa , M. Tsutsumi , C. Hall , Y. Tomikawa , R. Fujii

Geophys. Res. Lett. 2010年7月

Temperature enhancements and vertical winds in the lower thermosphere associated with auroral heating during the Dynamics and Energetics of the Lower Thermosphere in Aurora (DELTA) campaign 査読有り

Kurihara, J., S. Oyama, S. Nozawa, T. T. Tsuda, R. Fujii, Y. Ogawa, H. Miyaoka, N. Iwagami, T. Abe, K.-I. Oyama, M. Kosch, A. Aruliah, E. Griffin, and K. Kauristie

J. Geophys. Res. 2009年12月

Ion heating in high-speed flow channel within the duskside cell of the polar-cap ion convection under large IMF-By condition 査読有り

Maeda, S., Y. Ogawa, K. Hosokawa, S. Nozawa, S. Oyama, T. Tsuda and A. Brekke

J. Geophysical Research 2009年11月

Relations between proton auroras, intense electric field and ionospheric electron density depletion 査読有り

Fujii, R., Y. Iwata, S. Oyama, S. Nozawa, and Y. Ogawa

J. Geophysical Research 頁： 114, A09304, doi:10.1029/2009JA014319 2009年9月

Spatial evolution of frictional heating and the predicted thermospheric-wind effects in the vicinity of an auroral arc measured with the Sondrestrom incoherent-scatter radar and the Reimei satellite 査読有り

Oyama, S., T. T. Tsuda, T. Sakanoi, Y. Obuchi, K. Asamura, M. Hirahara, A. Yamazaki, Y. Kasaba, R. Fujii, S. Nozawa, and B. J. Watkins

J. Geophysical Research 114 巻 ( A07311 ) 頁： doi:10.1029/2009JA014091 2009年7月

Acceleration mechanism of high-speed neutral wind observed in the polar lower thermosphere 査読有り

Tsuda, T. T., S. Nozawa, S. Oyama, T. Motoba, Y. Ogawa, H. Shinagawa, N. Nishitani, K. Hosokawa, N. Sato, M. Lester, and R. Fujii

J. Geophysical Research 2009年4月

*Generation of the lower-thermospheric vertical wind estimated with the EISCAT KST radar at high latitudes during periods of moderate geomagnetic disturbance 査読有り

Oyama, S., B. J. Watkins, S. Maeda, H. Shinagawa, S. Nozawa, Y. Ogawa, A. Brekke, C. Lathuillere, and W. Kofman

Ann. Geophysicae 26 巻頁： 1491-1505 2008年6月

Excitation and diagnosis of cascading Langmuir waves in ionospheric plasmas at Gakona, Alaska, 査読有り

Burton, L. M., J. A. Cohen, R. Pradipta, A. Labno, M. C. Lee, O. Batishchev, D. L. Rokusek, S. P. Kuo, B. J. Watkins, and S. Oyama

Phys. Scr. 2008年

Temporal evolution of pump beam self-focusing at the High-Frequency Active Auroral Research Program 査読有り

Kosch M. J., T. Pedersen, E. Mishin, M. Starks, E. Gerken-Kendall, D. Sentman, S. Oyama, B. Watkins

J. Geophysical Research 2007年8月

Coordinated optical and radar observations of ionospheric pumping for a frequency pass through the second electron gyroharmonic at HAARP 査読有り

Kosch M. J., T. Pedersen, E. Mishin, S. Oyama, J. Hughes, A. Senior, B. Watkins, B. Bristow

J. Geophysical Research 2007年6月

A two-dimensional simulation of thermospheric vertical winds in the vicinity of an auroral arc 査読有り

Shinagawa, H., and Oyama, S

Earth Planets and Space 58 巻 ( 9 ) 頁： 58(9), 1173-1181 2006年9月

Persistent enhancement of the HF pump-induced plasma line measured with a UHF diagnostic radar at HAARP 査読有り

Oyama, S., B. J. Watkins, F. T. Djuth, M. J. Kosch, P. Bernhardt, and C. J. Heinselman

J. Geophysical Research 111 巻 ( A06309 ) 頁： 2005JA011363 2006年6月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Plasma lines excited by a powerful, high-frequency (HF) radio wave are studied using
data obtained with an ultrahigh frequency (UHF) radar at HAARP (High Frequency
Active Auroral Research Program) from 3 to 5 February 2005. Of particular interest is
persistent enhancement of the radar backscatter power during HF on at several HF
frequencies. The persistent enhancement is induced with the HF frequency slightly lower
than foF2 by a few hundred kHz; by contrast the persistent enhancement does not
appear when the HF frequency is equal to and higher than foF2 or lower than foF2 by
more than 500 kHz. When persistent enhancements of the radar backscatter power
appear, two case studies show that the local plasma frequency at the reflection height of
the O-mode polarization wave is close to the second or third electron gyroharmonic
frequencies, but one case study shows that the local plasma frequency at the reflection
height is significantly different from the third electron gyroharmonic frequency.

DOI： 10.1029/2005JA011363

*Application of a new beam configuration to estimate lower thermospheric vertical velocities at high latitudes with mono-static incoherent scatter radars 査読有り

Oyama, S., B. J. Watkins, S. Maeda, and J. Watermann

Radio Science 40 巻 ( RS4005 ) 頁： 2004RS003205 2005年7月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

We have developed a new beam configuration for monostatic incoherent scatter (IS)
radars at high latitudes in order to estimate the vertical component of the neutral wind
velocity in the lower thermosphere (from 100 to 120 km). This method has been applied to
experiments with the Sondrestrom IS radar, Greenland, on 5 and 8 March 2004. The
measurement and the analysis methods provide various temporal and altitudinal structures
of the vertical neutral wind velocity with amplitude of a few tens of meters per second at
3 km height resolution. This paper also demonstrates how to evaluate assumptions
adopted in calculations of the vertical neutral wind velocity using experimental data on
5 and 8 March 2004. Caution should be exercised in inferring effects of variations in
the thermospheric density or the ion-neutral collision frequency in association with
vertical thermospheric motions, in particular above 112 km.

DOI： 10.1029/2004RS003205

*Vertical ion motions observed with incoherent-scatter radars in the polar lower ionosphere 査読有り

Oyama, S., B. J. Watkins, S. Nozawa, S. Maeda, and M. Conde

J. Geophysical Research 110 巻 ( A04302 ) 頁： 2004JA010705 2005年4月

Summer-winter dependences of day-night differences in the ion temperature in the polar upper F region 査読有り

Oyama, S., C. Lathuillere, S. Maeda, and B. J. Watkins

Geophysical Research Letter 31 巻 ( L05806 ) 頁： 2003GL018820 2004年3月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

The daily variation of ion temperature observed with the
European Incoherent Scatter (EISCAT) Tromsø UHF radar in
the upper F region (from 300 to 500 km) has been found to
be significantly dependent on season. Of particular interest
is the statistics that the ion temperature at local night is
higher than that at local daytime for near solar maximum
summer conditions; by contrast no differences for winter.
Using the ion energy equation estimates of the heat
exchange with electrons suggest these local time and
seasonal differences. A case study using summer-time
data from the Sondrestrom incoherent-scatter radar
(ISR) also shows local-time dependences similar to
that observed with the Tromsø ISR. The case study
using a summer-time data from the EISCAT Svalbard
radar (ESR) shows the opposite sense. These seasonal
characteristics of the ion temperature that depend on the
observation site suggest that the day-night difference of ion
temperature in the polar upper F region has complicated
magnetic-latitudinal dependences.

DOI： 10.1029/2003GL018820

The quasi 2-day wave observed in the polar mesosphere (2): Comparison of the characteristics observed at Tromso and Poker Flat 査読有り

Nozawa, S., H. Iwahashi, A. Brekke, C. M. Hall, C. Meek, A. Manson, S. Oyama, Y. Murayama, and R. Fujii

J. Geophysical Research 頁： 108 , 101029/2002JD003221 2003年12月

Thermospheric and ionosphric dynamics in the auroral region 査読有り

Shinagawa, H., S. Oyama, S. Nozawa, S. C. Buchert, R. Fujii, and M. Ishii

Advances in Space Research 31 巻 ( 4 ) 頁： 951-956 2003年9月

Field-aligned ion motions in the polar E-F transition region: Mean characteristics 査読有り

Oyama, S., S. Nozawa, S. Maeda, Y. Murayama, R. Fujii, and H. Shinagawa

J. Geophysical Research 頁： 108(A8), 1334, doi:10.1029/2003JA009830 2003年8月

The quasi 2-day wave observed in the polar mesosphere 査読有り

Nozawa, S., S. Imaida, A. Brekke, C. Hall, C. Meek, A. Manson, S. Oyama, K. Dobashi, and R. Fujii

J. Geophysical Research 頁： 108, 10.1029/2002JD002440 2003年1月

A comparison study of the auroral lower thermopsheric neutral winds derived by the EISCAT UHF radar and the Tromso MF radar 査読有り

Nozawa, S., A. Brekke, A. Manson, C. M. Hall, C. Meek, K. Morise, S. Oyama, K. Dobashi, and R. Fujii

J. Geophysical Research 頁： 107, 10.1029/2000JA007581 2002年8月

Field-aligned ion motions in the E and F region 査読有り

Fujii, R., S. Oyama, S. C. Buchert, S. Nozawa, and N. Matuura

J. Geophysical Research 頁： 107, 10.1029/ 2001JA900148 2002年5月

Effects of auroral arc on the generation of atmospheric gravity waves in the polar F-region 査読有り

Oyama, S., H. Shinagawa, S. C. Buchert, R. Fujii, S. Nozawa, M. Ishii, Y, Murayama, and W. Kofman

Advances in Space Res. 27 巻頁： 1767-1772 2001年10月

*Generation of atmospheric gravity waves associated with auroral activity in the polar F region 査読有り

Oyama, S., M. Ishii, Y. Murayama, H. Shinagawa, S. C. Buchert, S. Nozawa, R. Fujii, and W. Kofman

J. Geophysical Research 106 巻頁： 18,543-18,554 2001年2月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Relationships between the generation of atmospheric gravity waves and
auroral activity were investigated using data on neutral
oscillations, at periods of 20-30 min,
estimated from European Incoherent Scatter radar data in the polar
F-region (150-300 km).
The equation for the neutral dispersion relation gave
the values of the wave parameters,
such as the
phase velocity and wavelength, applicable to the estimated oscillations.
These values were used to estimate the distance between the observation
position and the region where the oscillations were generated.
The estimated distance superimposed on all-sky images
taken at Kilpisjarvi suggests
that the auroral arc extended in an almost zonal direction related to
the generation of the oscillations.
The oscillations were compared with ones calculated
using the Francis model.
The phase surface of the modeled atmospheric gravity waves showed fairly
good agreement with that of the observed oscillations,
suggesting that the estimated distance is acceptable
for reproducing the estimated oscillations with the model.
It is concluded that auroral activities significantly relate to the AGW
generation in the polar thermosphere as investigated with theoretical
studies.

Effects of atmospheric oscillations on the field-aligned ion motions in the polar F-region 査読有り

Oyama, S., S. Nozawa, S. C. Buchert, M. Ishii, S. Watari, E. Sagawa, W. Kofman, J. Lilensten, and R. Fujii

Ann. Geophysicae 18 巻頁： 1154-1163 2000年9月

Dynamics of neutral wind in the polar region observed with two Fabry-Perot interferometers 査読有り

Ishii, M., S. Oyama, S. Nozawa, R. Fujii, E. Sagawa, S. Watari, and H. Shinagawa

Earth Planets and Space 51 巻頁： 833-844 1999年8月

　前のページ - 次のページ　

<大山 伸一郎>

論文 - 大山 伸一郎

<大山　伸一郎>

論文 - 大山　伸一郎