Arase Observation of Simultaneous Electron Scatterings by Upper-Band and Lower-Band Chorus Emissions

Y. Kazama, Y. Miyoshi, H. Kojima, Y. Kasahara, S. Kasahara, H. Usui, B. J. Wang, S. Y. Wang, S. W.Y. Tam, T. F. Chang, K. Asamura, S. Matsuda, A. Kumamoto, F. Tsuchiya, Y. Kasaba, M. Shoji, A. Matsuoka, M. Teramoto, T. Takashima, I. Shinohara

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Abstract

This study reports a relation between electron flux modulations and chorus emissions by using correlation analysis. On April 18, 2017, Arase observed an enhancement of electron fluxes and intensification of banded chorus emissions at the same time. A result of the analysis shows that both the upper-band and lower-band chorus emissions have good correlations with field-aligned electron fluxes that satisfy their resonance conditions. This indicates simultaneous interactions with both the emission bands and electrons, resulting in electron pitch-angle scattering toward the magnetic field direction. In addition, low-energy electron fluxes in the perpendicular direction also show positive correlations with the chorus intensities, probably because the chorus emissions are modulated by a fluctuation of perpendicular low-energy electron fluxes.

Original languageEnglish
Article numbere2021GL093708
JournalGeophysical Research Letters
Volume48
Issue number14
DOIs
Publication statusPublished - 2021 Jul 28

All Science Journal Classification (ASJC) codes

  • Geophysics
  • General Earth and Planetary Sciences

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