JpGU-AGU Joint Meeting 2017

講演情報

[EE] ポスター発表

セッション記号 P (宇宙惑星科学) » P-EM 太陽地球系科学・宇宙電磁気学・宇宙環境

[P-EM13] [EE] Exploring space plasma processes with Magnetospheric Multiscale (MMS) mission

2017年5月20日(土) 13:45 〜 15:15 ポスター会場 (国際展示場 7ホール)

コンビーナ:長谷川 洋(宇宙航空研究開発機構宇宙科学研究所)、Thomas Earle Moore(NASA Goddard Space Flight Ctr)、Benoit Lavraud(IRAP)、銭谷 誠司(自然科学研究機構国立天文台)

[PEM13-P05] Inverse Energy Dispersion of Energetic Ions Observed in the Magnetosheath

*Sun Hee Lee1David G. Sibeck1Kyoung-Joo Hwang1,2Yongfu Wang3Marcos V. D. Silveira1Mei-Ching Fok1Barry Mauk4Cohen J. Ian4Mike Ruohoniemi5Naritoshi Kitamura6Jim Burch7Barbara Giles1Roy Torbert8Christopher T. Russell9Mark Lester10 (1.NASA Goddard Space Flight Center、2.Goddard Planetary and Heliophysics Institute, University of Maryland, Baltimore County, Baltimore, MD 21228, USA.、3.Institute of Space Physics and Applied Technology School of Earth and Space Sciences, Peking University, Beijing 100871, China、4.The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Rd., Laurel, MD 20723, USA.、5.Bradley Department of Electrical and Computer Engineering, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, USA.、6.Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA) 3-1-1 Yoshinodai, Chuo-ku, Sagamihara, Kanagawa, Japan.、7.Southwest Research Institute, San Antonio, TX, USA.、8.University of New Hampshire, Durham, NH, USA.、9.University of California, Los Angeles, CA, USA.、10.Department of Physics and Astronomy, University of Leicester, Leicester, LE1 7RH, United Kingdom.)

We present a case study of energetic ions observed by the Energetic Particle Detector (EPD) on the Magnetospheric Multiscale (MMS) spacecraft in the magnetosheath just outside the subsolar magnetopause that occurred at 1000 UT on December 8, 2015. As the magnetopause receded inward, the EPD observed a burst of energetic (~50-1000 keV) proton, helium, and oxygen ions that exhibited an inverse dispersion, with the lowest energy ions appearing first.
The prolonged interval of fast antisunward flow observed in the magnetosheath and transient increases in the H components of global ground magnetograms demonstrate that the burst appeared at a time when the magnetosphere was rapidly compressed.
We attribute the inverse energy dispersion to the leakage along reconnected magnetic field lines of betatron-accelerated energetic ions in the magnetosheath and a burst of reconnection has an extent of about 1.5 RE using combined Super Dual Auroral Radar Network (SuperDARN) radar and EPD observations.