A Concise Empirical Formula for the Field-Aligned Distribution of Auroral Kilometeric Radiation Based on Arase Satellite and Van Allen Probes

Sai Zhang, Si Liu, Wentao Li, Yihua He, Qiwu Yang, Fuliang Xiao, Atsushi Kumamoto, Yoshizumi Miyoshi, Yosuke Nakamura, Fuminori Tsuchiya, Yoshiya Kasahara, Iku Shinohara

Research output: Contribution to journalArticlepeer-review

Abstract

Auroral kilometric radiations (AKR) are strong radio emission phenomena, and can produce significant acceleration or scattering of radiation belt electrons. The variation of AKR wave amplitude with the latitude (λ) has not been reported so far owing to lack of measurements. Here, using observations of the Arase satellite and Van Allen Probes from March 23, 2017 to July 31, 2019, we present the first statistical study on the AKR electric field amplitude (Et) in the radiation belts for |λ| = 0° − 40° and L-shell L = 3.0–6.2. Results (totally 14,770 samples) show that Et can be described by a concise formula: Et(λ) = E0 exp(ξ sin |λ|), decreasing with decreasing latitude. Fitting parameters E0 and ξ are limited in the ranges: E0 = 0.054–0.340 mV/m and ξ = 3.0–4.2. Wave amplitudes are greater (smaller) under intense (weak) geomagnetic conditions. This study helps to better quantify the gyroresonance between AKR and radiation belt electrons.

Original languageEnglish
Article numbere2021GL092805
JournalGeophysical Research Letters
Volume48
Issue number8
DOIs
Publication statusPublished - 2021 Apr 28

Keywords

  • AKR
  • field-aligned
  • geomagnetic latitude
  • radiation belt
  • wave amplitude

ASJC Scopus subject areas

  • Geophysics
  • Earth and Planetary Sciences(all)

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