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

研究成果: Article査読

抄録

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.

本文言語English
論文番号e2021GL092805
ジャーナルGeophysical Research Letters
48
8
DOI
出版ステータスPublished - 2021 4 28

ASJC Scopus subject areas

  • 地球物理学
  • 地球惑星科学(全般)

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