Electrostatic Electron Cyclotron Harmonic Waves as a Candidate to Cause Pulsating Auroras

M. Fukizawa, T. Sakanoi, Y. Miyoshi, K. Hosokawa, K. Shiokawa, Y. Katoh, Y. Kazama, A. Kumamoto, F. Tsuchiya, Y. Miyashita, Y. M. Tanaka, Y. Kasahara, M. Ozaki, A. Matsuoka, S. Matsuda, M. Hikishima, S. Oyama, Y. Ogawa, S. Kurita, R. Fujii

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

Pulsating auroras (PsAs) are thought to be generated by precipitating electrons scattered by lower-band chorus (LBC) waves near the magnetic equator. One-to-one correlation between the LBC intensity and the PsA intensity has been reported. Electrostatic electron cyclotron harmonic (ECH) waves can also scatter electrons. However, direct correlation between ECH and PsA has not been reported yet. In this study, using a coordinated Exploration of energization and Radiation in Geospace (Arase) satellite and ground-based imager observation, we report that not only LBC but also ECH have correlation with PsA. We estimated the precipitating electron energy by assuming that the time lag when the cross-correlation coefficient became the highest was travel time of electrons from the modulation region. We found that the estimated energies show reasonable values as the cyclotron resonance energy of each wave.

Original languageEnglish
Pages (from-to)12,661-12,668
JournalGeophysical Research Letters
Volume45
Issue number23
DOIs
Publication statusPublished - 2018 Dec 16

Keywords

  • Arase
  • chorus
  • electrostatic electron cyclotron harmonic
  • inner magnetosphere
  • pulsating aurora
  • wave-particle interaction

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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