Updated on 2022/03/03

写真a

 
IEDA, Akimasa
 
Organization
Institute for Space-Earth Environmental Research Division for Integrated Studies Assistant Professor
Graduate School
Graduate School of Science
Title
Assistant Professor
Contact information
メールアドレス

Degree 1

  1. 博士(理学) ( 1998.3   京都大学 ) 

Research Interests 7

  1. magnetic reconnection

  2. plasmoid

  3. magnetosphere

  4. ionosphere

  5. substorm

  6. auroral breakup

  7. aurora

Research Areas 1

  1. Others / Others  / Space physics

Current Research Project and SDGs 2

  1. 地磁気逆計算法を用いたオーロラ電流系の解明

  2. 衛星観測と地磁気逆計算法によるオーロラ爆発開始条件の解明

Research History 2

  1. 宇宙科学研究所

    2001.4 - 2003.2

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    Country:Japan

  2. NASA Goddard space flight center

    1998.7 - 2001.3

Education 3

  1. Kyoto University   Graduate School, Division of Natural Science

    1995.4 - 1998.3

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    Country: Japan

  2. Kyoto University   Graduate School, Division of Natural Science

    1993.4 - 1995.3

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    Country: Japan

  3. Kyoto University   Faculty of Science

    1989.4 - 1993.3

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    Country: Japan

Professional Memberships 2

  1. Society of Geomagnetism and Earth, Planetary and Space Sciences

  2. American Geophysical Union

Awards 1

  1. National research council resident research associateship award

    1998.5   National research council  

 

Papers 48

  1. Curved Trajectory Effect on Charge-Exchange Collision at Ionospheric Temperatures Reviewed

    Ieda, A.

    Journal of Geophysical Research: Space Physics     2022.1

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    Collision between ions and neutral particles is an essential characteristic of Earth's ionosphere. This ion-neutral collision is usually caused by the polarization of neutral particles. This collision can also be caused by charge exchange, if the particle pair is parental, such as atomic oxygen and its ion. The total collision frequency is not the sum of the polarization and charge-exchange components, but is essentially equal to the dominant component. The total is enhanced only around the classic transition temperature, which is near the ionospheric temperature range (typically 200–2000 K). However, the magnitude of this enhancement has differed among previous studies; the maximum enhancement has been reported as 41% and 11% without physical explanation. In the present study, the contribution of the polarization force to the charge-exchange collision is expressed as a simple curved particle trajectory effect. As a result, the maximum enhancement is found to be 22%. It is discussed that the enhancement has been neglected in classic ionospheric studies partly due to confusion with the glancing particle contribution, which adds 10.5% to the polarization component. The enhancement has been neglected presumably also because there has been no functional form to express it. Such an expression is derived in this study.

    DOI: 10.1029/2020JA028441

    DOI: 10.1029/2020JA028441

  2. Atomic Oxygen Ion‐Neutral Collision Frequency Models at Ionospheric Temperatures Reviewed

    Ieda, A.

    Journal of Geophysical Research: Space Physics     2021.1

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1029/2021JA029612

    DOI: 10.1029/2021JA029612

  3. Ion-neutral collision frequencies for calculating ionospheric conductivity Reviewed

    Ieda, A.

    Journal of Geophysical Research: Space Physics   Vol. 125 ( 2 )   2020.2

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1029/2019JA027128

    Web of Science

  4. Simultaneous observation of auroral substorm onset in Polar satellite global images and ground-based all-sky images Reviewed

    Ieda Akimasa, Kauristie Kirsti, Nishimura Yukitoshi, Miyashita Yukinaga, Frey Harald U., Juusola Liisa, Whiter Daniel, Nose Masahito, Fillingim Matthew O., Honary Farideh, Rogers Neil C., Miyoshi Yoshizumi, Miura Tsubasa, Kawashima Takahiro, Machida Shinobu

    EARTH PLANETS AND SPACE   Vol. 70   2018.5

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1186/s40623-018-0843-3

    Web of Science

  5. Stepwise tailward retreat of magnetic reconnection: THEMIS observations Reviewed

    Ieda, A. , Y. Nishimura, Y. Miyashita, V. Angelopoulos, A. Runov, T. Nagai, H. U. Frey, D. H. Fairfield, J. A. Slavin, H. Vanhämaki, H. Uchino, R. Fujii, Y. Miyoshi, and S. Machida

    J. Geophys. Res. Space Physics   Vol. 121   page: 4548-4568   2016.5

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    Auroral stepwise poleward expansions were clarified by investigating a multiple-onset substorm that occurred on 27 February 2009. Five successive auroral brightenings were identified in all-sky images, occurring at approximately 10 min intervals. The first brightening was a faint precursor. The second brightening had a wide longitude; thus, it represented the Akasofu substorm onset. Other brightenings expanded poleward; thus, they were interpreted to be auroral breakups. These breakups occurred stepwise; that is, later breakups were initiated at higher latitudes. Corresponding reconnection signatures were studied using Time History of Events and Macroscale Interactions during Substorms (THEMIS) satellite observations from between 8 and 24 Re down the magnetotail. The Akasofu substorm onset was not accompanied by a clear reconnection signature in the tail. In contrast, the three subsequent auroral breakups occurred simultaneously (within a few min) with three successive fast flows at 24 Re; thus, these were interpreted to be associated with impulsive reconnection episodes. These three fast flows consisted of a tailward flow and two subsequent earthward flows. The flow reversal at the second breakup indicated that a tailward retreat of the near-Earth reconnection site occurred during the substorm expansion phase. In addition, the earthward flow at the third breakup was consistent with the classic tailward retreat near the end of the expansion phase; therefore, the tailward retreat is likely to have occurred in a stepwise manner. We interpreted the stepwise characteristics of the tailward retreat and poleward expansion to be potentially associated by a stepwise magnetic flux pile-up.

    DOI: 10.1002/2015JA022244

  6. Approximate forms of daytime ionospheric conductance Reviewed

    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.   Vol. 119   2014.11

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    The solar zenith angle (SZA) dependence of the conductance is studied and a simple theoretical form for the Hall-to-Pedersen conductance ratio is developed, using the peak plasma production height. The European Incoherent Scatter (EISCAT) radar observations at Tromso (67 MLAT) on 30 March 2012 were used to calculate the conductance. The daytime electric conductance is associated with plasma created by solar extreme ultraviolet radiation incident on the neutral atmosphere of the Earth. However, it has been uncertain whether previous conductance models are consistent with the ideal Chapman theory for such plasma productions. We found that the SZA dependence of the conductance is consistent with the Chapman theory after simple modifications. The Pedersen conductance can be understood by approximating the plasma density height profile as being flat in the topside E region, and by taking into account the upward gradient of atmospheric temperature. An additional consideration is necessary for the Hall conductance, which decreases with increasing SZA more rapidly than the Pedersen conductance. This rapid decrease is presumably caused by a thinning of the Hall conductivity layer from noon towards nighttime. We expressed this thinning in terms of the peak production height in the Chapman theory.

    DOI: 10.1002/2014JA020665

  7. A Statistical Study of Near-Earth Magnetotail Evolution During Pseudosubstorms and Substorms With THEMIS Data

    Fukui Kento, Miyashita Yukinaga, Machida Shinobu, Miyoshi Yoshizumi, Ieda Akimasa, Nishimura Yukitoshi, Angelopoulos Vassilis

    JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS   Vol. 125 ( 1 )   2020.1

  8. Simultaneous observation of auroral substorm onset in Polar satellite global images and ground-based all-sky images (vol 70, 73, 2018)

    Ieda Akimasa, Kauristie Kirsti, Nishimura Yukitoshi, Miyashita Yukinaga, Frey Harald U., Juusola Liisa, Whiter Daniel, Nose Masahito, Fillingim Matthew O., Honary Farideh, Rogers Neil C., Miyoshi Yoshizumi, Miura Tsubasa, Kawashima Takahiro, Machida Shinobu

    EARTH PLANETS AND SPACE   Vol. 71   2019.7

  9. Revisiting substorm events with preonset aurora

    Miyashita Yukinaga, Ieda Akimasa

    ANNALES GEOPHYSICAE   Vol. 36 ( 5 ) page: 1419-1438   2018.10

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.5194/angeo-36-1419-2018

    Web of Science

  10. Theory, modeling, and integrated studies in the Arase (ERG) project

    Seki Kanako, Miyoshi Yoshizumi, Ebihara Yusuke, Katoh Yuto, Amano Takanobu, Saito Shinji, Shoji Masafumi, Nakamizo Aoi, Keika Kunihiro, Hori Tomoaki, Nakano Shin'ya, Watanabe Shigeto, Kamiya Kei, Takahashi Naoko, Omura Yoshiharu, Nose Masahito, Fok Mei-Ching, Tanaka Takashi, Ieda Akimasa, Yoshikawa Akimasa

    EARTH PLANETS AND SPACE   Vol. 70   2018.2

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1186/s40623-018-0785-9

    Web of Science

  11. Visualization tool for three-dimensional plasma velocity distributions (ISEE_3D) as a plug-in for SPEDAS

    Keika Kunihiro, Miyoshi Yoshizumi, Machida Shinobu, Ieda Akimasa, Seki Kanako, Hori Tomoaki, Miyashita Yukinaga, Shoji Masafumi, Shinohara Iku, Angelopoulos Vassilis, Lewis Jim W., Flores Aaron

    EARTH PLANETS AND SPACE   Vol. 69   2017.12

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    Language:English   Publishing type:Research paper (scientific journal)  

    DOI: 10.1186/s40623-017-0761-9

    Web of Science

  12. A direct link between chorus emissions and pulsating aurora on timescales from milliseconds to minutes: A case study at subauroral latitudes Reviewed

    Ozaki, M., S. Yagitani, K. Sawai, K. Shiokawa, Y. Miyoshi, R. Kataoka, A. Ieda, Y. Ebihara, M. Connors, I. Schofield

    J. Geophys. Res. Space Physics   Vol. 120   page: 9617-9631   2015.11

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    DOI: 10.1002/2015JA021381

  13. Statistical visualization of the Earth's magnetotail and the implied mechanism of substorm triggering based on superposed-epoch analysis of THEMIS data Reviewed

    Machida, S., Y. Miyashita, A. Ieda, M. Nosé, V. Angelopoulos, and J. P. McFadden

    Ann. Geophys.   Vol. 32   page: 99–111   2014.2

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    DOI: 10.5194/angeo-32-99-2014

  14. Ground-based ELF/VLF chorus observations at subauroral latitudes - VLF-CHAIN Campaign Reviewed

    Shiokawa, K., Y. Yokoyama, A. Ieda, Y. Miyoshi, R. Nomura, S. Lee, N. Sunagawa, Y. Miyashita, M. Ozaki, K. Ishizaka, S. Yagitani, R. Kataoka, F. Tsuchiya, I. Schofield, and M. Connors

    J. Geophys. Res.   Vol. 119   2014

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    DOI: 10.1029/2014JA020161

  15. General solution for calculating polarization electric fields in the auroral ionosphere and application examples Reviewed

    Amm, O., R. Fujii, H. Vanhamäki, A. Yoshikawa, and A. Ieda

    J. Geophys. Res.   Vol. 118   page: A11217   2013.5

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    DOI: doi:10.1002/jgra.50254

  16. An application of the finite length Cowling channel model to auroral arcs with longitudinal variations Reviewed

    Fujii, R., O. Amm, H. Vanhamäki, A. Yoshikawa, and A. Ieda

    J. Geophys. Res.   Vol. 117   page: A11217   2012.11

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    DOI: doi:10.1029/2012JA017953

  17. Observed correlation between pulsating aurora and chorus waves at Syowa Station in Antarctica Reviewed

    Ozaki, M., S. Yagitani, K. Ishizaka, K. Shiokawa, Y. Miyoshi, A. Kadokura, H. Yamagishi, R. Kataoka, A. Ieda, Y. Ebihara, N. Sato, and I. Nagano

    J. Geophys. Res.   Vol. 117   page: A08211   2012

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    DOI: A08211, doi:10.1029/2011JA017478

  18. Rayleigh-Taylor type instability in auroral patches Reviewed

    Shiokawa, K., A. Nakajima, A. Ieda, K. Sakaguchi, R. Nomura, T. Aslaksen,M. Greffen, and E. Donovan

    J. Geophys. Res.   Vol. 115   page: A02211, doi:10.1029/2009JA014273   2010.2

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  19. A statistical investigation of the Cowling channel efficiency in the auroral zone Reviewed

    Amm, O., R. Fujii, K. Kauristie, A. Aikio, A. Yoshikawa, A. Ieda, and H. Vanhamäki

    J. Geophys. Res.   Vol. 116   page: A02304, doi:10.1029/2010JA015988   2010

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  20. Reformulation and energy flow of the Cowling channel Reviewed

    Fujii, R., O. Amm, A. Yoshikawa, A. Ieda, and H. Vanhamäki

    J. Geophys. Res.   Vol. 116   page: A02305, doi:10.1029/2010JA015989   2010

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  21. Pressure changes associated with substorm depolarization in the near-Earth plasma sheet Reviewed

    Y. Miyashita, S. Machida, A. Ieda, D. Nagata, Y. Kamide, M. Nosé, K. Liou, T. Mukai, S. P. Christon, C. T. Russell, I. Shinohara, and Y. Saito

    J. Geophys. Res.   Vol. 115   page: A12239, doi:10.1029/2010JA015608   2010

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  22. Optical and particle observations of type B red aurora Reviewed

    Ebihara, Y., T. Sakanoi, K. Asamura, M. Hirahara, and A. Ieda

    Geophys. Res. Lett.   Vol. 36   page: L20105, doi:10.1029/2009GL041037   2009.10

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  23. Geotail observations of plasma sheet ion composition over 16 years: On variations of average plasma ion mass and O+ triggering substorm model Reviewed

    Nose, M., A. Ieda, and S. P. Christon

    J. Geophys. Res.   Vol. 114   page: A07223, doi:10.1029/2009JA014203   2009.7

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  24. Longitudinal development of a substorm brightening arc Reviewed

    Shiokawa, K., A. Ieda, A. Nakajima, K. Sakaguchi, R. Nomura, T. Aslaksen, M. Greffen, E. Spanswick, E. Donovan, S. B. Mende, J. McFadden, K.-H. Glassmeier, V. Angelopoulos, and Y. Miyashita

    Ann. Geophys.   Vol. 27 ( 5 ) page: 1935-1940   2009

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  25. Statistical visualization of the Earth's magnetotail based on Geotail data and the implied substorm model Reviewed

    Machida, S., Y. Miyashita, A. Ieda, M. Nosé, D. Nagata, K. Liou, T. Obara, A. Nishida, Y. Saito, and T. Mukai

    Ann. Geophys.   Vol. 27   page: 1035-1046   2009

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  26. *Longitudinal association between magnetotail reconnection and auroral breakup based on Geotail and Polar observations Reviewed

    Ieda, A., D. H. Fairfield, J. A. Slavin, K. Liou, C.-I. Meng, S. Machida, Y. Miyashita, T. Mukai, Y. Saito, M. Nosé, J.-H. Shue, G. K. Parks, and M. O. Fillingim

    J. Geophys. Res.   Vol. 113 ( A8 ) page: A08207, 10.1029/2008JA013127   2008.8

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  27. *Two classes of earthward fast flows in the plasma sheet Reviewed

    J.-H. Shue, A. Ieda, A. T. Y. Lui, G. K. Parks, T. Mukai, and S. Ohtani

    J. Geophys. Res.   Vol. 113 ( A2 ) page: A002205, doi:10.1029/2007JA012456   2008.2

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  28. Towards understanding the electrodynamics of the 3-dimensional high-latitude ionosphere: present and future, Reviewed

    Amm, O., A. Aruliah, S. C. Buchert, R. Fujii, J.W. Gjerloev, A. Ieda, T. Matsuo, C. Stolle, H. Vanham¨aki, and A. Yoshikawa

    Ann. Geophys.   Vol. 26   page: 3913–3932   2008

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  29. Mapping of ionospheric parameters for space weather predictions: A concise review Invited Reviewed

    Kamide Y., and A. Ieda

    Sci. China Ser. E-Tech. Sci.   Vol. 51 ( 10 ) page: 1589-1599, doi:10.1007/s11431-008-0254-y   2008

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  30. Simultaneous ground and satellite observations of an isolated proton arc at subauroral latitudes Reviewed

    Sakaguchi, K., K. Shiokawa, A. Ieda, Y. Miyoshi, Y. Otsuka, T. Ogawa, M. Connors, E. F. Dononvan, and F. J. Rich

    J. Geophys. Res   Vol. 112   page: A04202, doi:10.1029/2006JA012135   2007

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  31. ERG - A small-satellite mission to investigate the dynamics of the inner magnetosphere Reviewed

    Shiokawa, K., K. Seki, Y. Miyoshi, A. Ieda, T. Ono, M. Iizima, T. Nagatsuma, T. Obara, T. Takashima, K. Asamura, Y. Kasaba, A. Matsuoka, Y. Saito, H. Saito, M. Hirahara, Y. Tonegawa, F. Toyama, M. Tanaka, M. Nose, Y. Kasahara, K. Yumoto, H. Kawano, A. Yoshikawa, Y. Ebihara, A. Yukimatsu, N. Sato, S. Watanabe, and the Inner Magnetosphere Subgroup in the Society of Geomagnetism and Earth, Planetary and Space Sciences

    Adv. Space Res.   Vol. 38 ( 8 ) page: 1861-1869   2006

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  32. Plasmoids observed in the near-Earth magnetotail at X~-7 Re Reviewed

    J. Geophys. Res   Vol. 110   page: A12214, doi:10.1029/2005JA011263   2005

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  33. Solar wind control of the radial distance of the magnetic reconnection site in the magnetotail Reviewed

    Nagai T., M. Fujimoto, R. Nakamura, W. Baumjohann, A. Ieda, I. Shinohara, S. Machida, Y. Saito, and T. Mukai

    J. Geophys. Res   Vol. 110   page: A09208, doi:10.1029/2005JA011207   2005

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  34. Geotail observations of signatures in the near-Earth magnetotail for the extremely intense substorms of the 30 October 2003 storm Reviewed

    Miyashita Y., Y. Miyoshi, Y. Matsumoto, A. Ieda, Y. Kamide, M. Nosé, S. Machida, H. Hayakawa, R. W. McEntire, S. P. Christon, D. S. Evans, and O. A. Troshichev

    J. Geophys. Res   Vol. 110   page: A09S25, doi:10.1029/2005JA011070   2005

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  35. Magnetotail response to prolonged southward IMF Bz intervals: Loading, unloading, and continuous magnetospheric dissipation Reviewed

    Tanskanen, E. I., J. A Slavin, D. H. Fairfield, D. G Sibeck, J. Gjerloev, T. Mukai, A. Ieda, and T. Nagai

    J. Geophys. Res   Vol. 110   page: A03216, doi: 10.1029/2004JA010561   2005

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  36. Real-time modeling of the ionosphere using GEDAS/KRM for space weather

    Ieda, A. and Y. Kamide

    Proceedings of The 7th International School/Symposium for Space Simulations     page: 259-260   2005

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  37. Difference between earthward and tailward flows in their dependences on geomagnetic and IMF conditions Reviewed

    Ieda, A., T. Mukai, S. Machida, J.-H. Shue, S.-I. Ohtani, T. Nagai, and Y. Saito

    COSPAR Colloquia Series   Vol. 16   page: 186-189   2004

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  38. Difference in magnetotail variations between intense and weak substorms Reviewed

    Miyashita Y., Y. Kamide, S. Machida, K. Liou, T. Mukai, Y. Saito, A. Ieda, C.-I. Meng, and G. K. Parks

    J. Geophys. Res   Vol. 109   page: doi:10.1029/2004JA010588   2004

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  39. Roles of the magnetic reconnection in the Earth's magnetotail during substorms: Geotail observations Invited Reviewed

    Machida, S., A. Ieda, and Y. Miyashita

    Physics of Magnetic Reconnection in High-Temperature Plasmas, edited by M. Ugai, Research Signpost, Kerala, India     page: 161-191   2004

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  40. *Quiet time magnetotail plasma flow: Coordinated Polar ultraviolet images and Geotail observations Reviewed

    Ieda, A., J.-H. Shue, K. Liou, S.-I. Ohtani, C.-I. Meng, D.H. Fairfield, T. Mukai, Y. Saito, S. Machida, T. Nagai, and G.K. Parks

    J. Geophys. Res.   Vol. 108   page: 10.1029/2002JA009739   2003

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  41. Quantitative relationships between rlasma sheet fast flows and nightside auroral power Reviewed

    J.-H. Shue, S. Ohtani, P.T. Newell, K. Liou, C.-I. Meng, A. Ieda, and T. Mukai

    J. Geophys. Res   Vol. 108   page: 10.1029/2002JA009794   2003

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  42. Geotail observations of magnetic flux ropes in the plasm a sheet, Reviewed

    Slavin, J.A., R.P. Lepping, J. Gjerloev, D.H. Fairfield, M. H esse, C.J. Owen, M.B. Moldwin, T. Nagai, A. Ieda, and T. Mukai

    J. Geophys. Res   Vol. 108   page: 10.1029/2002JA009557   2003

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  43. Simultaneous observations of earthward flow burst and plasmoid ejection during magnetospheric substorms Reviewed

    Slavin, J.A., D.H. Fairfield, R.P. Lepping, M. Hesse, A. Ieda, E. Tanskanen, N. Ostgaard, T. Mukai, T. Nagai, H.J. Singer, and P.R. Sutcliffe

    J. Geophys. Res   Vol. 107   page: 10.1029/2000JA003501   2002

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  44. Magnetospheric signature of an ionospheric traveling convection vortex event Reviewed

    Moretto, T., M. Hesse, A. Yahnin, A. Ieda, D. Man, and J.F. Waternann

    J. Geophys. Res   Vol. 107   page: 10.1029/2001JA000049   2002

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  45. *Plasmoid ejection and auroral brightenings Reviewed

    Ieda, A., D.H. Fairfield, T. Mukai, Y. Saito, S. Kokubun, K. Liou, C.-I. Meng, G.K. Parks, and M.J. Brittnacher

    J. Geophys. Res.   Vol. 106   page: 3845-3857   2001

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  46. Statistical visualization of Earth's magnetotail during substorms by means of multidimensional superposed epoch analysis with Geotail data Reviewed

    Machida, S., A. Ieda, T. Mukai, Y. Saito, and A. Nishida

    J. Geophys. Res.   Vol. 105   page: 25,291-25,303   2000

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  47. GEOTAIL observations of flow velocity and north-south magnetic field variations in the near and mid-distant tail associated with substorm onsets Reviewed

    Machida, S., Y. Miyashita, A. Ieda, A. Nishida, T. Mukai, Y. Saito, and S. Kokubun,

    Geophys. Res. Lett   Vol. 26   page: 635-638   1999

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  48. *Statistical analysis of the plasmoid evolution with Geotail observations Reviewed

    Ieda, A., S. Machida, T. Mukai, Y. Saito, T. Yamamoto, A. Nishida, T. Terasawa, and S. Kokubun

    J. Geophys. Res.   Vol. 103   page: 4453-4465   1998

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Presentations 4

  1. 尾部リコネクション領域の移動:THEMIS地上・衛星観測

    家田章正

    磁気圏ダイナミクス研究会 

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    Event date: 2018.3

    Language:English   Presentation type:Oral presentation (general)  

    Venue:名古屋大学, 名古屋   Country:Japan  

  2. オーロラキロメートル放射とオーロラ極方向拡大との関係:Geotail衛星と地上全天観測 International conference

    家田章正, 宮下幸長, 町田忍, 三浦翼, 川嶋貴大

    , 地球電磁気・地球惑星圏学会(第142回総会・講演会), 

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    Event date: 2017.10

    Language:English   Presentation type:Oral presentation (general)  

    Venue:京都大学, 宇治   Country:Japan  

  3. Simultaneous observation of auroral substorm onset in Polar satellite global images and ground-based all-sky images Invited International conference

    The 13th International Conference on Substorms 

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    Event date: 2017.9

    Language:English   Presentation type:Oral presentation (invited, special)  

    Venue:Sheraton Portsmouth Harborside Hotel, Portsmouth, NH, USA   Country:Japan  

  4. Simultaneous observation of auroral substorm onset in Polar satellite global images and ground-based all-sky images International conference

    19. Ieda, A., S. Machida, Y. Miyoshi, T. Kawashima, T. Miura, K. Kauristie, Y. Nishimura, Y. Miyashita, G. K. Parks, and M. O. Fillingim

    地球惑星科学連合2017年大会 

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    Event date: 2017.5

    Language:English   Presentation type:Oral presentation (general)  

    Venue:幕張メッセ, 幕張   Country:Japan  

KAKENHI (Grants-in-Aid for Scientific Research) 3

  1. Study of auroral current system using multi-satellite observations

    Grant number:16K05568  2016.4 - 2020.3

    Ieda Akimasa

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    Authorship:Principal investigator 

    Grant amount:\4550000 ( Direct Cost: \3500000 、 Indirect Cost:\1050000 )

    Aurora near the midnight polar ionosphere (100 km altitude) brightens explosively approximately every a few hours. This auroral breakup is supposed to represent an electrical short of the current flowing in the magnetotail (50-200 million meters) into the ionosphere. We studied auroral breakup using simultaneous ground-satellite observations. In particular, we clarified the reason why auroral breakup jumps to a higher latitude every 10 min. We also clarified the reason why auroral breakup looks different between ground observations and satellite observations.

  2. 地磁気逆計算法を用いたオーロラ電流系の解明

    2008.4 - 2012.3

    科学研究費補助金  基盤研究(C)

    家田 章正

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    Authorship:Principal investigator 

  3. 衛星観測と地磁気逆計算法によるオーロラ爆発開始条件の解明

    2005.4 - 2008.3

    科学研究費補助金  若手研究(B)

    家田 章正

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    Authorship:Principal investigator