SM041-0006
Energy conversion associated with a series of dipolarization fronts observed by MMS.
Tuesday, 15 December 2020
Poster
Soboh AlQeeq1, Olivier Le Contel2, Patrick Canu3, Alessandro Retino3, Thomas Chust2, Alexandra Alexandrova4, Laurent Mirioni2, Yuri Khotyaintsev5, Rumi Nakamura6, Frederick D Wilder7, Narges Ahmadi8, Hanying Wei9, Matthew R Argall10, David Fischer11, Daniel J Gershman12, James L Burch13, Roy B Torbert14, Barbara L Giles12, Stephen A Fuselier15, Robert Ergun16, Per-Arne Lindqvist17, Christopher T Russell18, Robert J Strangeway19, Drew L. Turner20, Ian Cohen21 and MMS, (1)Laboratoire de Physique des Plasmas, Paris, France, (2)Laboratoire de Physique des Plasmas (UMR7648), CNRS/Ecole Polytechnique/UPMC/Univ. Paris Sud/Obs. de Paris, Paris, France, (3)Laboratoire de Physique des Plasmas, Palaiseau, France, (4)Laboratoire de Physique des Plasmas, CNRS/Ecole Polytechnique/UPMC/Univ. Paris Sud/Obs. de Paris, Saint-Maur Des Fossés Cedex, France, (5)IRF Swedish Institute of Space Physics, Uppsala, Sweden, (6)Space Reserach Institute, Austrian Academy of Sciences, Graz, Austria, (7)University of Colorado at Boulder, Boulder, CO, United States, (8)Laboratory for Atmospheric and Space Physics, Boulder, CO, United States, (9)University of California Los Angeles, Los Angeles, CA, United States, (10)University of New Hampshire, Durham, NH, United States, (11)Space Research Institute, Austrian Academy of Sciences, Graz, Austria, (12)NASA Goddard Space Flight Center, Greenbelt, MD, United States, (13)Southwest Research Institute San Antonio, San Antonio, TX, United States, (14)Univ New Hampshire, Durham, NH, United States, (15)Southwest Research Institute, San Antonio, TX, United States, (16)Univ Colorado, Boulder, CO, United States, (17)KTH Royal Institute of Technology, Stockholm, Sweden, (18)University of California, Los Angeles, CA, United States, (19)UCLA IGPP/ESS, Los Angeles, CA, United States, (20)The Aerospace Corporation, Los Angeles, CA, United States, (21)Johns Hopkins University Applied Physics Laboratory, Laurel, MD, United States
Abstract:
In the present study, we consider four dipolarization front (DF) events detected by MMS spacecraft in the Earth’s magnetotail during a substorm on 23rd of July 2017 between 16:05 and 17:19 UT. From their ion scale properties (Bz, density, temperature, pressure and velocity jumps) these four DF events associated with the fast Earthward plasma flows and are typical with an increase of temperature and decrease of density across the DF.MMS was located at the edge of the current sheet which was in a quasi-static state. Then, MMS suddenly entered in the central plasma sheet and MMS detected a series of the earthward plasma flows, which were associated with a substrom activity measured on the ground (AE index is about 400 nT). Fast earthward plasma flows were measured for about 1 hour starting with a period of quasi-steady flow and followed by a saw-tooth like series of fast flows associated with dipolarization fronts. This plasma transport sequence finished with a flow reversal still occurring close to the magnetic equator. In the present study, we discuss the energy conversion processes at ion and electron scales in the vicinity of the dipolarization fronts.
