Faculty Profiles - SHINBORI Atsuki

Papers - SHINBORI Atsuki

Division display 61 - 80 of about 160 ／ All the affair displays >>

Temporal and Spatial Variations of Total Electron Content Enhancements During a Geomagnetic Storm on 27 and 28 September 2017 Reviewed

Shinbori, A; Otsuka, Y; Sori, T; Tsugawa, T; Nishioka, M

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 125 ( 7 ) 2020.7

Language：English Publishing type：Research paper (scientific journal) Publisher：Journal of Geophysical Research: Space Physics

Temporal and spatial evolutions of total electron content (TEC) and electron density in the ionosphere during a geomagnetic storm that occurred on 27 and 28 September 2017 have been investigated using global TEC data obtained from many Global Navigation Satellite System stations together with the ionosonde, geomagnetic field, Jicamarca incoherent scatter and Super Dual Auroral Radar Network (SuperDARN) radar data. Our analysis results show that a clear enhancement of the ratio of the TEC difference (rTEC) first occurs from noon to afternoon at high latitudes within 1 hr after a sudden increase and expansion of the high-latitude convection and prompt penetration of the electric field to the equator associated with the southward excursion of the interplanetary magnetic field. Approximately 1–2 hr after the onset of the hmF2 increase in the midlatitude and low-latitude regions associated with the high-latitude convection enhancement, the rTEC and foF2 values begin to increase and the enhanced rTEC region expands to low latitudes within 1–2 hr. This signature suggests that the ionospheric plasmas in the F2 region move at a higher altitude due to local electric field drift, where the recombination rate is smaller, and that the electron density increases due to additional production at the lower altitude in the sunlit region. Later, another rTEC enhancement related to the equatorial ionization anomaly appears in the equatorial region approximately 1 hr after the prompt penetration of the electric field to the equator and expands to higher latitudes within 3–4 hr.

DOI： 10.1029/2019JA026873

Web of Science

Scopus

researchmap

Characteristics of GNSS Total Electron Content Enhancements Over the Midlatitudes During a Geomagnetic Storm on 7 and 8 November 2004 Reviewed

Sori T., Shinbori A., Otsuka Y., Tsugawa T., Nishioka M.

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 124 ( 12 ) page： 10376 - 10394 2019.12

Observation and characterization of traveling ionospheric disturbances induced by solar eclipse of 20 March 2015 using incoherent scatter radars and GPS networks Reviewed

Panasenko Sergii V, Otsuka Yuichi, van de Kamp Max, Chernogor Leonid F, Shinbori Atsuki, Tsugawa Takuya, Nishioka Michi

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS Vol. 191 2019.9

Direct Observations of Traveling Ionospheric Disturbances as Focusers of Solar Radiation: Spectral Caustics Reviewed

Koval Artem, Chen Yao, Tsugawa Akuya, Otsuka Yuichi, Shinbori Atsuki, Nishioka Michi, Brazhenko Anatoliy, Stanislaysky Aleksander, Konovalenko Aleksander, Zhang Qing-He, Monstein Christian, Gorgutsa Roman

ASTROPHYSICAL JOURNAL Vol. 877 ( 2 ) 2019.6

Response of the Ionosphere-Plasmasphere Coupling to the September 2017 Storm: What Erodes the Plasmasphere so Severely? Reviewed

Obana, Y, N. Maruyama, A. Shinbori, K. Hashimoto, M. Fedrizzi, M. Nose, Y. Otsuka, N. Nishitani, T. Hori, A. Kumamoto, F. Tsuchiya, S. Matsuda, A. Matsuoka, Y. Kasahara, A. Yoshikawa, Y. Miyoshi, I. Shinohara

Space Weather Vol. 17 ( 6 ) page： 861 - 876 2019.6

Relationship between the low-latitude coronal hole area, solar wind velocity, and geomagnetic activity during solar cycles 23 and 24 Reviewed

Nakagawa Yumi, Nozawa Satoshi, Shinbori Atsuki

EARTH PLANETS AND SPACE Vol. 71 ( 1 ) 2019.2

The Space Physics Environment Data Analysis System (SPEDAS) Reviewed

Angelopoulos V., Cruce P., Drozdov A., Grimes E. W., Hatzigeorgiu N., King D. A., Larson D., Lewis J. W., McTiernan J. M., Roberts D. A., Russell C. L., Hori T., Kasahara Y., Kumamoto A., Matsuoka A., Miyashita Y., Miyoshi Y., Shinohara I., Teramoto M., Faden J. B., Halford A. J., McCarthy M., Millan R. M., Sample J. G., Smith D. M., Woodger L. A., Masson A., Narock A. A., Asamura K., Chang T. F., Chiang C. -Y., Kazama Y., Keika K., Matsuda S., Segawa T., Seki K., Shoji M., Tam S. W. Y., Umemura N., Wang B. -J., Wang S. -Y., Redmon R., Rodriguez J. V., Singer H. J., Vandegriff J., Abe S., Nose M., Shinbori A., Tanaka Y. -M., UeNo S., Andersson L., Dunn P., Fowler C., Halekas J. S., Hara T., Harada Y., Lee C. O., Lillis R., Mitchell D. L., Argall M. R., Bromund K., Burch J. L., Cohen I. J., Galloy M., Giles B., Jaynes A. N., Le Contel O., Oka M., Phan T. D., Walsh B. M., Westlake J., Wilder F. D., Bale S. D., Livi R., Pulupa M., Whittlesey P., DeWolfe A., Harter B., Lucas E., Auster U., Bonnell J. W., Cully C. M., Donovan E., Ergun R. E., Frey H. U., Jackel B., Keiling A., Korth H., McFadden J. P., Nishimura Y., Plaschke F., Robert P., Turner D. L., Weygand J. M., Candey R. M., Johnson R. C., Kovalick T., Liu M. H., McGuire R. E., Breneman A., Kersten K., Schroeder P.

SPACE SCIENCE REVIEWS Vol. 215 ( 1 ) page： 9 2019.2

The Space Physics Environment Data Analysis System (SPEDAS) Reviewed

V Angelopoulos, P Cruce, A Drozdov, EW Grimes, N Hatzigeorgiu, DA King, D Larson, JW Lewis, JM McTiernan, DA Roberts, CL Russell, T Hori, Y Kasahara, A Kumamoto, A Matsuoka, Y Miyashita, Y Miyoshi, I Shinohara, M Teramoto, JB Faden, AJ Halford, M McCarthy, RM Millan, JG Sample, DM Smith, LA Woodger, A Masson, AA Narock, K Asamura, TF Chang, C-Y Chiang, Y Kazama, K Keika, S Matsuda, T Segawa, K Seki, M Shoji, SWY Tam, N Umemura, B-J Wang, S-Y Wang, R Redmon, JV Rodriguez, HJ Singer, J Vandegriff, S Abe, M Nose, A Shinbori, Y-M Tanaka, S UeNo, L Andersson, P Dunn, C Fowler, JS Halekas, T Hara, Y Harada, CO Lee, R Lillis, DL Mitchell, MR Argall, K Bromund, JL Burch, IJ Cohen, M Galloy, B Giles, AN Jaynes, O Le Contel, M Oka, TD Phan, BM Walsh, J Westlake, FD Wilder, SD Bale, R Livi, M Pulupa, P Whittlesey, A DeWolfe, B Harter, E Lucas, U Auster, JW Bonnell, CM Cully, E Donovan, RE Ergun, HU Frey, B Jackel, A Keiling, H Korth, JP McFadden, Y Nishimura, F Plaschke, P Robert, DL Turner, JM Weygand, RM Candey, RC Johnson, T Kovalick, MH Liu, RE McGuire, A Breneman, K Kersten, P Schroeder

Space Sci. Rev. Vol. 215 ( 1 ) page： 9 2019.1

Temporal and Spatial Variations of Mid-Latitude Ionospheric Trough during a Geomagnetic Storm Based on Global GNSS-TEC and Arase Satellite Observations Reviewed

Shinbori A., Otsuka Y., Tsugawa T., Nishioka M., Kumamoto A., Tsuchia F., Matsuda S., Kasahara Y.

2018 2nd URSI Atlantic Radio Science Meeting, AT-RASC 2018 2018.9

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：2018 2nd URSI Atlantic Radio Science Meeting, AT-RASC 2018

The Earth's plasmasphere is the vast 'doughnut' shaped dense plasma region of the magnetosphere that is filled with cold ions and electrons of ionospheric origin. The plasmaspheric plasma density shows an abrupt drop by a factor of 5 or more around 4-6 Re (Re: Earth's radius). The boundary has been called 'plasmapause'. Since the plasmaspheric cold plasma controls generation of plasma waves, their propagation features, and particle acceleration via wave-particle interaction, detailed investigation of the temporal and spatial variations of the plasmasphere and plasmapause location during a geomagnetic storm is important for understanding a change in plasma wave environments in the inner magnetosphere. Recent studies showed a good correlation between the mid-latitude ionospheric trough and the plasmapause for both geomagnetically quiet and disturbed conditions [1]. However, they did not reach the detailed investigation of the characteristics of spatial variation of the mid-latitude ionospheric trough and its temporal variation with high resolution due to limitation of a usage of global GIM of TEC. In this study, we investigate characteristics of temporal and spatial variations of the mid-latitude ionospheric trough during a geomagnetic storm which occurred on April 4, 2017 using the 5-min average Global Navigation Satellite System (GNSS) Total Electron Content (TEC) data together with solar wind, interplanetary magnetic field, geomagnetic field, and Arase High Frequency Analyzer (HFA) (subcomponent of Plasma Wave Experiment (PWE)) observation data. As a result, the location of the mid-latitude ionospheric trough moves equatorward from 60 to 48 degrees within 4 hours after the onset of the storm main phase. The movement speed increases from 1.3 to 3.5 degrees of geomagnetic latitude per hour after the onset of storm-time substorm. The increasing speed means an abrupt shrink of the plasmasphere due to a sudden enhancement of convection electric field in the inner magnetosphere associated with the substorm onset. The location of the mid-latitude ionospheric trough identified from the minimum value of the GNSS-TEC data from the auroral to mid-latitude regions is almost in good agreement with that of an abrupt drop of electron density derived from the upper limit frequency of the upper hybrid resonance (UHR) waves detected by the HFA instrument onboard the Arase satellite. In this case, the electron density profile along the Arase orbit shows an irregular variation of the electron density near the plasmapause. During the main phase of the geomagnetic storm, the geomagnetic longitude distribution of the mid-latitude trough location shows a wavy structure with its scale of 1000-2500 km. The shape of the wavy structure varies with time during the storm main phase. This phenomenon has not yet been reported before due to the limitation of ground dense GNSS receiver networks. After the start of the recovery phase of the geomagnetic storm, the mid-latitude ionospheric trough quickly moves poleward from 48 to 60 degrees in geomagnetic latitude within 4 hours in a geomagnetic longitude range of 310-360 degrees in geomagnetic longitude. The average speed of the poleward movement is 2.3 degrees of geomagnetic latitude per hour.

DOI： 10.23919/URSI-AT-RASC.2018.8471490

Scopus

Temporal and spatial variations of storm-time mid-latitude ionospheric trough based on global GNSS-TEC and Arase satellite observations Reviewed

Shinbori, A, Y. Otsuka, T. Tsugawa, M. Nishioka, A. Kumamoto, F. Tsuchia, S. Matsuda, Y. Kasahara, A. Matsuoka, J. M. Ruohoniemi, S. G. Shepherd, N. Nishitani

Geophys. Res. Lett. Vol. 45 ( 15 ) page： 7362 - 7370 2018.8

Total Electron Content Observations by Dense Regional and Worldwide International Networks of GNSS

Tsugawa Takuya, Nishioka Michi, Ishii Mamoru, Hozumi Kornyanat, Saito Susumu, Shinbori Atsuki, Otsuka Yuichi, Saito Akinori, Buhari Suhaila M., Abdullah Mardina, Supnithi Pornchai

JOURNAL OF DISASTER RESEARCH Vol. 13 ( 3 ) page： 535-545 2018.6

Total Electron Content Observations by Dense Regional and Worldwide International Networks of GNSS

Tsugawa Takuya, Nishioka Michi, Ishii Mamoru, Hozumi Kornyanat, Saito Susumu, Shinbori Atsuki, Otsuka Yuichi, Saito Akinori, Buhari Suhaila M., Abdullah Mardina, Supnithi Pornchai

Journal of Disaster Research Vol. 13 ( 3 ) page： 535 - 545 2018.6

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Fuji Technology Press Ltd.

<p>Two-dimensional ionospheric total electron content (TEC) maps have been derived from ground-based Global Navigation Satellite System (GNSS) receiver networks and applied to studies of various ionospheric disturbances since the mid-1990s. For the purpose of monitoring and researching ionospheric conditions and ionospheric space weather phenomena, we have developed TEC maps of areas over Japan using the dense GNSS network, GNSS Earth Observation NETwork (GEONET), which consists of about 1300 stations and is operated by the Geospatial Information Authority of Japan (GSI). Currently, we are providing high-resolution, two-dimensional maps of absolute TEC, detrended TEC, rate of TEC change index (ROTI), and loss-of-lock on GPS signal over Japan on a real-time basis. Such high-resolution TEC maps using dense GNSS receiver networks are one of the most effective ways to observe, on a scale of several 100 km to 1000 km, ionospheric variations caused by traveling ionospheric disturbances and/or equatorial plasma bubbles, which can degrade single-frequency and differential GNSS positioning/navigation. We have collected all the available GNSS receiver data in the world to expand the TEC observation area. Currently, however, dense GNSS receiver networks are available in only limited areas, such as Japan, North America, and Europe. To expand the two-dimensional TEC observation with high resolution, we have conducted the Dense Regional and Worldwide International GNSS TEC observation (DRAWING-TEC) project, which is engaged in three activities: (1) standardizing GNSS-TEC data, (2) developing a new high-resolution TEC mapping technique, and (3) sharing the standardized TEC data or the information of GNSS receiver network. We have developed a new standardized TEC format, GNSS-TEC EXchange (GTEX), which is included in the Formatted Tables of ITU-R SG 3 Databanks related to Recommendation ITU-R P.311. Sharing the GTEX TEC data would be easier than sharing the GPS/GNSS data among those in the international ionospheric researcher community. The DRAWING-TEC project would promote studies of medium-scale ionospheric variations and their effect on GNSS.</p>

DOI： 10.20965/jdr.2018.p0535

Scopus

CiNii Research

Temporal and spatial variations of mid-latitude ionospheric trough during a geomagnetic storm based on global GNSS-TEC and Arase satellite observations Reviewed

Shinbori Atsuki, Otsuka Yuichi, Tsugawa Takuya, Nishioka Michi, Kumamoto Atsushi, Tsuchia Fuminori, Matsuda Shoya, Kasahara Yoshiya

2018 2ND URSI ATLANTIC RADIO SCIENCE MEETING (AT-RASC) page： . 2018

Wire Probe Antenna (WPT) and Electric Field Detector (EFD) of Plasma Wave Experiment (PWE) aboard the Arase satellite Reviewed

Kasaba, Y, K. Ishisaka, Y. Kasahara, T. Imachi, S. Yagitani, H. Kojima, S. Matsuda, M. Shoji, S. Kurita, T. Hori, A. Shinbori, M. Teramoto, Y. Miyoshi, T. Nakagawa, N. Takahashi, Y. Nishimura, A. Matsuoka, A. Kumamoto, F. Tsuchiya, R. Nomura

Earth Planets Space Vol. 69 ( 174 ) 2017.12

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 Reviewed

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

EARTH PLANETS AND SPACE Vol. 69 ( 1 ) 2017.11

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER HEIDELBERG

The plasmas (electrons and ions) in the inner magnetosphere have wide energy ranges from electron volts to mega-electron volts (MeV). These plasmas rotate around the Earth longitudinally due to the gradient and curvature of the geomagnetic field and by the co-rotation motion with timescales from several tens of hours to less than 10 min. They interact with plasma waves at frequencies of mHz to kHz mainly in the equatorial plane of the magnetosphere, obtain energies up to MeV, and are lost into the ionosphere. In order to provide the global distribution and quantitative evaluation of the dynamical variation of these plasmas and waves in the inner magnetosphere, the PWING project (study of dynamical variation of particles and waves in the inner magnetosphere using ground-based network observations, http://www.isee.nagoya-u.ac.jp/dimr/PWING/) has been carried out since April 2016. This paper describes the stations and instrumentation of the PWING project. We operate all-sky airglow/aurora imagers, 64-Hz sampling induction magnetometers, 40-kHz sampling loop antennas, and 64-Hz sampling riometers at eight stations at subauroral latitudes (similar to 60 degrees geomagnetic latitude) in the northern hemisphere, as well as 100-Hz sampling EMCCD cameras at three stations. These stations are distributed longitudinally in Canada, Iceland, Finland, Russia, and Alaska to obtain the longitudinal distribution of plasmas and waves in the inner magnetosphere. This PWING longitudinal network has been developed as a part of the ERG (Arase)-ground coordinated observation network. The ERG (Arase) satellite was launched on December 20, 2016, and has been in full operation since March 2017. We will combine these ground network observations with the ERG (Arase) satellite and global modeling studies. These comprehensive datasets will contribute to the investigation of dynamical variation of particles and waves in the inner magnetosphere, which is one of the most important research topics in recent space physics, and the outcome of our research will improve safe and secure use of geospace around the Earth.

DOI： 10.1186/s40623-017-0745-9

Web of Science

Scopus

researchmap

Characteristics of Seasonal Variation and Solar Activity Dependence of the Geomagnetic Solar Quiet Daily Variation Reviewed

Atsuki Shinbori, Yukinobu Koyama, Masahito Nos{\'{e, Tomoaki Hori, Yuichi Otsuka

Journal of Geophysical Research: Space Physics Vol. 122 ( 10 ) page： 10796 - 10810 2017.10

Propagation and evolution of electric fields associated with solar wind pressure pulses based on spacecraft and ground-based observations Reviewed

N. Takahashi, Y. Kasaba, Y. Nishimura, A. Shinbori, T. Kikuchi, T. Hori, Y. Ebihara, N. Nishitani

JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS Vol. 122 ( 8 ) page： 8446 - 8461 2017.8

Language：English Publishing type：Research paper (scientific journal) Publisher：AMER GEOPHYSICAL UNION

We investigate spatial and temporal evolution of large-scale electric fields in the magnetosphere and ionosphere associated with sudden commencements (SCs) using multipoint equatorial magnetospheric (THEMIS, RBSP, and GOES) and ionospheric (C/NOFS) satellites with radars (SuperDARN). A distinct SC event on 17 March 2013 shows that the magnetospheric electric field in the equatorial plane propagates from dayside toward nightside as a fast-mode wave. The ionospheric electric field responds similar to 41s after the onset of dayside magnetospheric electric field, which can be explained by the propagation of the Alfven wave along magnetic field lines. The wavelet analysis shows that the Alfven wave is dominant in the plasmasphere. Poynting fluxes toward the ionosphere support these propagations. From a statistical analysis of response time, tailward propagation speed is estimated at about 1000-1100km/s. We also statistically derive a spatial distribution and time evolution of the magnetospheric electric field in the dawn-dusk direction (E-y). Our result shows that negative E-y (dawnward) propagates from noon toward the magnetotail, followed by positive E-y (duskward). The propagation characteristics of electric fields in the equatorial plane depend on magnetic local time. At noon, negative E-y lasts for about 1min, and positive E-y becomes dominant about 2min after the SC onset. Negative E-y soon attenuates in the nightside region, while the positive E-y propagates fairly well to the premidnight or postmidnight regions while maintaining a certain amplitude. The enhancement of positive E-y is due to the enhancement of magnetospheric convection associated with the main impulse of SCs.

DOI： 10.1002/2017JA023990

Web of Science

Scopus

researchmap

Other Link： http://orcid.org/0000-0002-8160-3553

京大RISHにおける生存圏データベースの公開

橋口浩之, 津田敏隆, 塩谷雅人, 山本衛, 杉山淳司, 新堀淳樹

科学データ研究会・WDS国内シンポジウム 2017.3

生存圏アジアリサーチノード

津田敏隆, 橋口浩之, 森拓郎, 新堀淳樹

生存圏ミッションシンポジウム 2017.2

Thermal and Low-energy Ion Outflows in and through the Polar Cap Reviewed

Naritoshi Kitamura, Kanako Seki, Yukitoshi Nishimura, Takumi Abe, Manabu Yamada, Shigeto Watanabe, Atsushi Kumamoto, Atsuki Shinbori, Andrew W. Yau

Magnetosphere-Ionosphere Coupling in the Solar System page： 91 - 100 2016.10

　 PREV - NEXT 　

<SHINBORI Atsuki>

Papers - SHINBORI Atsuki