[P-EM13] Dynamics of the Inner Magnetospheric System

[PEM13-P05] A statistical study of plasma characteristics in the near-Earth plasma sheet using MMS observations

*Retsu MIYAMOTO¹, Kunihiro Keika¹, Hoshino Masahiro¹ (1.Department of Earth and Planetary Science, The University of Tokyo )

Keywords:plasma sheet, MMS data analysis, fast flow

A statistical study using THEMIS data [Runov et al., 2015] showed three important features about plasma around fast flows in the near-Earth plasma sheet. (1) The average plasma temperature and energy flux inside dipolarizing flux bundles (DFB) have a direct connection with the average temperature and flux in the ambient plasma sheet. (2) The plasma intruding with DFB into the near-Earth plasma sheet is, on average, a factor of 2 hotter than the background plasma. The difference is consistent with the ratio of the magnetic field strength. (3) Ions and electrons within a DFB behave quasi-adiabatically on average, similar to the ambient plasma sheet. In this study, we will perform a similar analysis using data from the MMS satellite to examine whether the same characteristics are seen. We will also investigate the quasi-adiabaticity, particularly under quiet conditions with no fast flows observed.

Reference:
Runov, A., V. Angelopoulos, C. Gabrielse, J. Liu, D. L. Turner, and X.-Z. Zhou (2015), Average thermodynamic and spectral properties of plasma in and around dipolarizing flux bundles, J. Geophys. Res. Space Physics, 120, 4369–4383.