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A Case Study of Transversely Heated Low­Energy Helium Ions by EMIC Waves in the Plasmasphere

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Title
A Case Study of Transversely Heated Low­Energy Helium Ions by EMIC Waves in the Plasmasphere
Other Titles
플라즈마권에서 발생한 EMIC 파동에 의한 저에너지 이온 입자의 가속 현상 분석
Authors
Kim, Khan-Hyuk
Kwon, Hyuck-Jin
Lee, Junhyun
Jin, Ho
Seough, Jungjoon
Subject
Astronomy & Astrophysics
Issue Date
2021-02
Citation
Kim, Khan-Hyuk, et al. 2021. "A Case Study of Transversely Heated Low­Energy Helium Ions by EMIC Waves in the Plasmasphere". JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS, 126(2): 1-16.
Abstract
The Van Allen Probe A spacecraft observed strong ∼0.5­Hz helium (He+) band and weak ∼0.8­Hz hydrogen (H+) band EMIC waves on April 17, 2018, at L = similar to 4.5-5.2, in the dawn sector, near the magnetic equator, and close to the plasmapause. We examined low­energy ion fluxes observed by the Helium Oxygen Proton and Electron (HOPE) instrument onboard Van Allen Probe A during the wave interval and found that low­energy He+ flux (<10 eV) enhancements occur nearly simultaneously with He­band and H­band EMIC wave power enhancements in a direction mostly perpendicular to the background magnetic field without significant low­energy H+ and O+ flux variations. We suggest that cold He+ ions (<1 eV) are preferentially and transversely heated up 10 eV through the interaction with EMIC waves inside the plasmasphere. The low­Earth orbit spacecraft observed localized precipitations of energetic protons in the upper ionosphere at subauroral latitudes near the magnetic field footprint of Van Allen Probe A. Our observations provide a clear evidence that EMIC waves play an important role in the overall dynamics in the inner magnetosphere, contributing to the high­energy particle loss and low­energy particle energization.
URI
https://repository.kopri.re.kr/handle/201206/11949
DOI
http://dx.doi.org/10.1029/2020JA028560
Appears in Collections  
2021-2021, Occurrence of aurora and their correlations with polar upper atmospheric and climate variabilities (21-21) / Jee, Geonhwa (PE21020)
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