Studies on acceleration mechanisms of relativistic electrons in theEarth's outer radiation belt with observations and simulations

• Project/Area Number: 22540458
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Single-year Grants
• Section: 一般
• Research Field: Space and upper atmospheric physics
• Research Institution: Tokyo Institute of Technology
• Principal Investigator: NAGAI Tsugunobu 東京工業大学, 大学院・理工学研究科, 教授 (60260527)
• Project Period (FY): 2010 – 2012
• Project Status: Completed (Fiscal Year 2012)
• Budget Amount: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000); Fiscal Year 2012: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2011: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000); Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
• Keywords: 太陽地球システム / 宇宙天気 / 放射線帯 / サブストーム / 高エネルギー電子 / 磁気嵐 / 地球放射線帯

Research Abstract

The spacecraft Akebono has made observations of relativistic electrons in the Earth’s radiation belts with the radiation monitor (RDM). The observations by Akebono have revealed rapid rebuilding of the core part (around L = 4) of the electron outer belt with a time scale of less than a few hours during the Dst minimum period for several storms. Simulations for formation of the outer radiation belt are attempted. A simulation in which the magnetic field and electric field are deduced from the global MHD model under realistic solar wind conditions is carried out. This model can successfully simulate a rapid rebuilding of the outer radiation belt with the observed time scale.

Research Products

• [Journal Article] Rebuilding process of the outer electron radiation belt: The spacecraft Akebono observations, Dynamics of the Earth's Radiation Belts and Inner Magnetosphere (2012)
  • Author(s): Nagai, T.
  • Journal Title: Geophysical Monograph Series Volume: 199 Pages: 177-187
  • Peer Reviewed
• [Journal Article] Rebuilding process of the outer electron radiation belt: The spacecraft Akebono observations (2012)
  • Author(s): T. Nagai
  • Journal Title: Dynamics of the Earth’s Radiation Belts and Inner Magnetosphere, Geophysical Monograph Series Volume: 199 Pages: 177-187
  • DOI: 10.1029/2012gm001281
  • Peer Reviewed
• [Journal Article] Recent developments in the radiation belt environment model (2011)
  • Author(s): Fok. M.-C., A. Glocer, Q. Zheng, R.B. Horne, N.P. Meredith, J.M. Albert and T. Nagai
  • Journal Title: J. Atmos Solar-Terr. Phys Volume: 73 Issue: 11-12 Pages: 1435-1443
  • DOI: 10.1016/j.jastp.2010.09.033
  • Peer Reviewed
• [Journal Article] Rapid rebuilding of the outer radiation belt (2011)
  • Author(s): Glocer, A., M.-C. Fok, T. Nagai, G. Toth, T. Guild, and J. Blake
  • Journal Title: J. Geophys. Res. Volume: 116 Issue: A9 Pages: 1-21
  • DOI: 10.1029/2011ja016516
  • Peer Reviewed
• [Journal Article] Recent developments in the radiation belt environment model (2011)
  • Author(s): Fok.M.-C., A.Glocer, Q.Zheng, R.B.Horne, N.P.Meredith, J.M.Albert, T.Nagai
  • Journal Title: J.Atmospheric and Solar-Terrestrial Physics Volume: (In press)
  • Peer Reviewed
• [Presentation] Structure of magnetic reconnection in the Earth's magnetotail:Geotail observations (2013)
  • Author(s): T. Nagai
  • Organizer: AGU Chapman Conference
  • Place of Presentation: Reykjavik, Iceland.
  • Year and Date: 2013-03-12
• [Presentation] Structure of magnetic reconnection in the Earth's magnetotail: Geotail observations (2013)
  • Author(s): T. Nagai
  • Organizer: American Geophysical Union Chapman Conference
  • Place of Presentation: Reikjavik, Iceland
• [Presentation] Construction of magnetic reconnection in the Earth's magnetotail with Geotail observations (2011)
  • Author(s): T. Nagai
  • Organizer: IUGG
  • Place of Presentation: Melbourne, Australia.
  • Year and Date: 2011-07-05
• [Presentation] Linkage of magnetic reconnection in the magnetotail to substorm onset on the ground (2011)
  • Author(s): T. Nagai, and O. Amm
  • Organizer: AGU Chapman Conference
  • Place of Presentation: Fairbanks, U.SA.
  • Year and Date: 2011-03-04
• [Presentation] Linkage of magnetic reconnection in the magnetotail to substorm onset on the ground (2011)
  • Author(s): T.Nagai, O.Amm
  • Organizer: AGU Chapman Conference
  • Place of Presentation: Fairbanks, Alaska
  • Year and Date: 2011-03-04
• [Presentation] Construction of magnetic reconnection in the near-earth magnetotail with Geotail (2011)
  • Author(s): T. Nagai
  • Organizer: International Union of Geodesy and Geophysics
  • Place of Presentation: Melbourne, Australia
• [Presentation] 太陽活動2周期にわたる放射線帯の変動 (2010)
  • Author(s): 長井嗣信・浅井佳子
  • Organizer: あけぼのの22周年記念シンポジウム
  • Place of Presentation: 東京工業大学キャンパスイノベーションセンター.
  • Year and Date: 2010-11-22
• [Presentation] 太陽活動2周期にわたる放射線帯の変動 (2010)
  • Author(s): 長井嗣信, 浅井佳子
  • Organizer: あけぼのの22周年記念シンポジウム
  • Place of Presentation: 東京工業大学キャンパスイノベーションセンター
  • Year and Date: 2010-11-22
• [Remarks]
  • URL: http://www.geo.titech.ac.jp/lab/nagai/nagai/RDM2010,RDM2011,RDM2012,RDM2013
• [Remarks]
  • URL: http://www.stp.isas.jaxa.jp/akebono/RDM/rdm.html
• [Remarks]
  • URL: http://www.stp.isas.jaxa.jp/akebono/RDM/rdm.html