Observational evidence of electron pitch angle scattering driven by ECH waves

Satoshi Kurita, Yoshizumi Miyoshi, Christopher M. Cully, Vassilis Angelopoulos, Olivier Le Contel, Mitsuru Hikishima, Hiroaki Misawa

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Using the plasma wave and electron data obtained from Time History of Events and Macroscale Interactions during Substorms, we show a signature of electron pitch angle scattering driven by Electrostatic Cyclotron Harmonic (ECH) waves in the velocity distribution function (VDF). The diffusion curve of whistler mode waves is used as a proxy to identify changes in VDFs due to wave-particle interactions. We confirm that the shape of the VDF well agrees with the diffusion curve of whistler mode waves when whistler mode chorus alone is active. On the other hand, we find that the shape of the VDF deviates from the diffusion curves at low pitch angles when ECH waves are active following the inactivation of chorus waves. The result is observational support for electron pitch angle scattering caused by ECH waves and suggests that ECH waves can contribute to generation of diffuse auroras.

Original languageEnglish
Pages (from-to)8076-8080
Number of pages5
JournalGeophysical Research Letters
Volume41
Issue number22
DOIs
Publication statusPublished - 2014 Nov 28

Keywords

  • ECH wave
  • diffuse aurora
  • diffusion curve
  • pitch angle scattering
  • whistler mode wave

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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