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-P04] Currents and associated electron scattering and bouncing near the diffusion region at Earth’s magnetopause

*Benoit Lavraud1Yongcun Zhang2Yoann Vernisse1Daniel Gershman3John Dorelli3,4Paul Cassak5Jérémy Dargent1Craig Pollock3Barbara Giles3Nicolas Aunai6Matthew Argall7Levon Avanov3Alexander Barrie3,8James Burch9Michael Chandler3Li-Jen Chen3Ian Cohen11Victoria Coffey10Jonathan Eastwood12Jan Egedal13Stefan Eriksson14Robert Ergun14Charlie Farrugia7Stephen Fuselier9Vincent Génot1Daniel Graham15Elena Grigorenko16Hiroshi Hasegawa17Christian Jacquey1Issaad Kacem1Yuri Khotyaintsev15Olivier Le Contel6Elisabeth MacDonald3Werner Magnes18Barry Mauk11Thomas Moore3Toshifumi Mukai17Rumi Nakamura18William Paterson3Emmanuel Penou1Tai Phan19Amy Rager3,20Alessandro Retino6Z. Rong21Christopher Russell22Yoshifumi Saito17Jean-André Sauvaud1Stephen Schwartz12C. Shen23Suzanne Smith4 (1.IRAP-CNRS, Toulouse, France、2.State Key Laboratory of Space Weather, NSSC/CAS, Beijing, China、3.NASA Goddard Space Flight Center, Greenbelt, MD、4.University of Maryland, College Park, MD、5.West Virginia University, WV、6.Laboratoire de Physique des Plasmas, Palaiseau, France、7.University of New Hampshire, Durham, NH、8.Millenium Engineering, Arlington, VA、9.Southwest Research Institute, San Antonio, TX、10.NASA Marshall Space Flight Center, Huntsville, AL、11.Johns Hopkins University Applied Physics Laboratory, Laurel, MD、12.The Blackett Laboratory, Imperial College, London, UK、13.University of Wisconsin, Madison, WI、14.University of Colorado / Laboratory for Atmospheric & Space Physics, Boulder, CO、15.Swedish Institute of Space Physics, Uppsala, Sweden、16.Space Research Institute of the Russian Academy of Sciences, Moscow, Russia、17.Institute of Space and Astronautical Science, JAXA, Sagamihara, Japan、18.Space Research Institute, Austrian Academy of Sciences, Graz, Austria、19.Space Sciences Laboratory, Berkeley, CA、20.Catholic University of America, Washington, DC、21.Key Laboratory of Earth and Planetary Physics, IGG/CAS, Beijing, China、22.University of California, Los Angeles, CA、23.Harbin Institute of Technology, Shenzhen, China)

キーワード:Reconnection, Electrons, Plasma

Based on high-resolution measurements from NASA’s Magnetospheric Multiscale mission, we present the dynamics of electrons associated with current systems observed near the diffusion region of magnetic reconnection at Earth’s magnetopause. Using pitch angle distributions (PAD) and magnetic curvature analysis we demonstrate the occurrence of electron scattering in the curved magnetic field of the diffusion region down to energies of 20 eV. We show that scattering occurs closer to the current sheet as the electron energy decreases. The scattering of inflowing electrons, associated with field-aligned electrostatic potentials and Hall currents, produces a new population of scattered electrons with broader PAD which bounce back and forth in the exhaust. Except at the center of the diffusion region the two populations are collocated and behave adiabatically: the PAD of inflowing electrons focuses inward (towards lower magnetic field), while the bouncing population gradually peaks at 90° away from the center (where it mirrors owing to higher magnetic field and probable field-aligned potentials).