Numerical Study of High Frequency Modulation of Electron Precipitation by a Whistler Chorus Element Observed by Arase Satellite

Shinji Saito, Yoshizumi Miyoshi, Shoya Matsuda, Satoshi Kurita, Yoshiva Kasahara, Atsushi Kumamoto, Fuminori Tsuchiya, Ayako Matsuoka

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Bursty precipitation of and gt;tens keV electrons can be a source of pulsating aurora which has quasi-periodic on-off switching of luminosity. Besides the on-off switching, relatively high frequency ( and gt; and gt;3Hz) modulation is found to be embedded during the on-time [1]. A cause of electron bursts for the pulsating aurora is whistler chorus waves. Intermittent enhancement of whistler chorus elements at magnetic equator scatters radiation belt electrons in pitch angle and energy through the cyclotron resonance process. A lower band chorus element has a duration of less than a second and varies its frequency in time. Furthermore, amplitude of magnetic fluctuation in the element is actively changed in time as observed by Van Allen Probes spacecraft [2]. Although amplitudes of whistler chorus elements are usually below 100 pT, there are chorus waves with instantaneous amplitudes as high as one nT. Such a high amplitude is enough to make nonlinear effects which affect precipitation of radiation belt electrons into the atmosphere [3].

Original languageEnglish
Title of host publication2018 2nd URSI Atlantic Radio Science Meeting, AT-RASC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9789082598735
DOIs
Publication statusPublished - 2018 Sep 24
Event2nd URSI Atlantic Radio Science Meeting, AT-RASC 2018 - Gran Canaria, Spain
Duration: 2018 May 282018 Jun 1

Publication series

Name2018 2nd URSI Atlantic Radio Science Meeting, AT-RASC 2018

Other

Other2nd URSI Atlantic Radio Science Meeting, AT-RASC 2018
Country/TerritorySpain
CityGran Canaria
Period18/5/2818/6/1

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Signal Processing
  • Electrical and Electronic Engineering
  • Instrumentation

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