Study of variations of magnetic field structure and ion compositionin the inner magnetosphere by using multi-satellite observation

2008 Fiscal Year Final Research Report

• Project/Area Number: 19740303
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Single-year Grants
• Research Field: Space and upper atmospheric physics
• Research Institution: Kyoto University
• Principal Investigator: NOSE Masahito Kyoto University, 大学院・理学研究科, 助教 (90333559)
• Project Period (FY): 2007 – 2008
• Keywords: 地球惑星磁気圏 / サブストーム / リングカレント / イオン組成 / 粒子加速

Research Abstract

これまでは、静止衛星軌道より内側のリングカレント領域(高度20000-30000km付近)の磁場構造はそれほど大きく変化しないと考えられることが多く、双極子磁場による近似が行われてきた。しかしながら、MDS-1衛星の磁場観測により、このような領域でもサブストームに伴う磁場双極子化や高周波の磁場擾乱が現れたり、磁場構造が強く引き伸ばされた形状になったりするように、内部磁気圏の磁場構造は想像以上に変動していることが明らかになった。こうした磁場変動は、特に酸素イオンを選択的に加速し、リングカレントのイオン組成変化に重要な役割を果たしていることが分かった。

Research Products

• [Journal Article] Response of ions of ionospheric origin to storm-time substorms : Coordinated observations over the ionosphere and in the plasma sheet (2009)
  • Author(s): Nose, M., S. Taguchi, S. P. Christon, M. R. Collier, T. E. Moore, C. W. Carlson, and J. P. McFadden
  • Journal Title: J. Geophys. Res. 114, A05207 Pages: doi:10.1029/2009JA014048
• [Journal Article] Geotail observations of plasma sheet ion composition over 16 years : On variations of average plasma ion mass and O^+ triggering substorm model (2009)
  • Author(s): Nose, M., A. leda, S. P. Christon
  • Journal Title: J. Geophys. Res. 114(in press) Pages: doi:10.1029/2009JA014203
• [Journal Article] New substorm index derived from high-resolution geomagnetic field data at low latitude and its comparison with AE and ASY indices (2009)
  • Author(s): Nose, M., T. Iyemori, M. Takeda, H. Toh, T. Ookawa, G Cifuentes-Nava, J. Matzka, J. J. Love, H. McCreadie, M. K. Tuncer, and J. J. Curto
  • Journal Title: Proceedings of XIIIth IAGA Workshop (in press)
• [Journal Article] The role of magnetic field fluctuations in non-adiabatic acceleration of ions during dipolarization (2009)
  • Author(s): Ono, Y., M. Nose, S. P. Christon, and A. T. Y. Lui
  • Journal Title: J. Geophys. Res. 114(in press) Pages: doi:10.1029/2008JA013918
• [Journal Article] A state-of-the-art picture of substorm-associated evolution of the near-Earth magnetotail obtained from superposed epoch analysis (2009)
  • Author(s): Miyashita, Y., 他15名
  • Journal Title: J. Geophys. Res. 114, A01211 Pages: doi:1029/2008JA013225
• [Journal Article] Statistical visualization of the Earth's magnetotail based on Geotail data and the implied substorm model (2009)
  • Author(s): Machida, S., 他9名
  • Journal Title: Ann. Geophys. 27 Pages: 1035-1046
• [Journal Article] Statistical analysis of Pi2 pulsations inside and outside the plasmasphere observed by the polar orbiting DE-1 satellite (2008)
  • Author(s): Teramoto, M., M. Nose, and P. R. Sutcliffe
  • Journal Title: J. Geophys. Res. 113, A07203 Pages: doi:1029/2007JA012740
• [Journal Article] Longitudinal association between magnetotail reconnection and auroral breakup based on Geotail and Polar observations (2008)
  • Author(s): Ieda, A., 他12名
  • Journal Title: J. Geophys. Res. 113, A08207 Pages: doi:1029/2008JA013127
• [Journal Article] Dawnside particle injection caused by sudden enhancement of solar wind dynamic pressure (2008)
  • Author(s): Han, D. -S., H. -G. Yang, M. Nose, D. -H. Huang, Z. -T. Chen, and H. -Q. Hu
  • Journal Title: J. Atmos. Solar-Terr. Phys. 70 Pages: 1995-1998
• [Journal Article] Determination of the substorm initiation region from a major conjunction interval of THEMIS satellites (2008)
  • Author(s): Lui, A. T. Y., 他12名
  • Journal Title: J. Geophys. Res. 113, A00C04 Pages: doi:1029/2008JA013424
• [Journal Article] Storm phase dependence of ion outflow : Statistical signatures obtained by IMAGE/LENA (2007)
  • Author(s): Kunori, T., M. Nose, S. Taguchi, K. Hosokawa, M. R. Collier, and T. E. Moore
  • Journal Title: Geophys. Res. Lett. 34, L18106 Pages: doi:1029/2007GL029877
• [Journal Article] Coupling of perturbations in the solar wind density to global Pi3 pulsations : A case study (2007)
  • Author(s): Han D. -S., 他9名
  • Journal Title: J. Geophys. Res. 112, A05217 Pages: doi:1029/2006JA011675
• [Journal Article] Polarization analysis of a Pi2 pulsation using continuous wavelet transform (2007)
  • Author(s): Kulesh M., M. Nose, M. Holschneider, and K. Yumoto
  • Journal Title: Earth Planet. Space 59 Pages: 961-970
• [Presentation] MDS-1 satellite observations of magnetic field dipolarization in the deep inner magnetosphere (2008)
  • Author(s): Nose M. 他4名
  • Organizer: 平成20年度磁気圏電離圏シンポジウム
  • Place of Presentation: 神奈川県・淵野辺( Invited)
  • Year and Date: 2008-11-26
• [Presentation] New substorm index derived from high-resolution geomagnetic field data obtained at globally distributed low-latitude stations (2008)
  • Author(s): Nose M. 他10名
  • Organizer: International Symposium : Fifty Years after IGY
  • Place of Presentation: Tsukuba, Ibaragi
  • Year and Date: 2008-11-10
• [Presentation] MDS-1 satellite observations of magnetic field dipolarization in the deep inner magnetosphere (2008)
  • Author(s): 能勢正仁、他4名
  • Organizer: 第124回地球電磁気・地球惑星圏学会総会
  • Place of Presentation: 宮城県・仙台
  • Year and Date: 2008-10-10
• [Presentation] Pi2 pulsations : Cavity mode resonance or BBF-driven process? (2008)
  • Author(s): Nose M.
  • Organizer: XIIIth IAGA Workshop on Geomagnetic Observatory Instruments, Data Acquisition and Processing
  • Place of Presentation: Boulder, USA
  • Year and Date: 2008-06-17
• [Presentation] New substorm index derived from high-resolution geomagnetic field data at low latitude and its comparison with AE and ASY indices (2008)
  • Author(s): Nose M., 他9名
  • Organizer: XIIIth IAGA Workshop on Geomagnetic Observatory Instruments, Data Acquisition and Processing
  • Place of Presentation: Boulder, USA
  • Year and Date: 2008-06-16
• [Presentation] Magnetic field dipolarization in the inner magnetosphere observed by the MDS-1 satellite (2008)
  • Author(s): Nose M., 他3名
  • Organizer: 地球惑星科学関連学会2008年合同大会
  • Place of Presentation: 千葉県・幕張
  • Year and Date: 2008-05-27
• [Presentation] New substorm index derived from high-resolution geomagnetic field data at low latitude and its comparison with real-time AE index (2007)
  • Author(s): Nose M., 他7名
  • Organizer: 第122回地球電磁気・地球惑星圏学会総会
  • Place of Presentation: 愛知県・名古屋
  • Year and Date: 2007-09-30
• [Presentation] Variations of Plasma Sheet Ion Composition during the 23rd Solar Cycle (2007)
  • Author(s): Nose M., 他3名
  • Organizer: 第122回地球電磁気・地球惑星圏学会総会
  • Place of Presentation: 愛知県・名古屋
  • Year and Date: 2007-09-28
• [Presentation] Relation between the ring current energy and the SYM-H index (2007)
  • Author(s): Nose M., 他7名
  • Organizer: Asia Oceania Geosciences Society 4th Annual Meeting
  • Place of Presentation: Bangkok, Thailand(Invited)
  • Year and Date: 2007-08-02
• [Presentation] New substorm index derived from high-resolution geomagnetic field data at low latitude and its comparison with real-time AE index (2007)
  • Author(s): Nose M., 他6名
  • Organizer: IUGG XXIV 2007
  • Place of Presentation: Perugia, Italy
  • Year and Date: 2007-07-05
• [Presentation] Variations of Terrestrial Plasma Environment during the 23rd Solar Cycle : Geotail/EPIC Observations of Ion Composition (2007)
  • Author(s): Nose M., 他3名
  • Organizer: IUGG XXIV 2007
  • Place of Presentation: Perugia, Italy
  • Year and Date: 2007-06-06
• [Presentation] Relation between the ring current energy and the SYM-H index (2007)
  • Author(s): Nose M., 他7名
  • Organizer: 地球惑星科学関連学会2007年合同大会
  • Place of Presentation: 千葉県・幕張
  • Year and Date: 2007-05-19
• [Presentation] Simultaneous observations of ions of ionospheric origin over the ionosphere and in the plasma sheet at storm-time substorms (2007)
  • Author(s): Nose M.
  • Organizer: Taiwan Geosciences Assembly
  • Place of Presentation: Taoyuan, Taiwan(Invited)
  • Year and Date: 2007-05-17
• [Remarks]
  • URL: http://wdc.kugi.kyoto-u.ac.jp/nose/index.html