Atmospheric Ionization Caused by EMIC-Wave Driven Energetic Electron Precipitation at Auroral Latitude

被引：0

作者：

Murase, Kiyoka ^{[1
,2
]}

Kataoka, Ryuho ^{[2
,3
]}

Tanaka, Yoshimasa ^{[2
,4
,5
]}

Nishiyama, Takanori ^{[2
,4
]}

Hashimoto, Taishi ^{[2
,4
]}

Sato, Kaoru ^{[6
]}

机构：

[1] Kitami Inst Technol, Kitami, Japan

[2] Natl Inst Polar Res, Tokyo, Japan

[3] Okinawa Inst Sci & Technol, Okinawa, Japan

[4] SOKENDAI, Grad Univ Adv Studies, Tokyo, Japan

[5] Res Org Informat & Syst, Polar Environm Data Sci Ctr, Joint Support Ctr Data Sci Res, Tokyo, Japan

[6] Univ Tokyo, Tokyo, Japan

来源：

GEOPHYSICAL RESEARCH LETTERS | 2025年 / 52卷 / 11期

基金：

日本科学技术振兴机构;

关键词：

energetic electron precipitation; EMIC wave; atmospheric ionization; MIDDLE;

D O I：

10.1029/2024GL114248

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

Electromagnetic ion cyclotron (EMIC) waves are recognized as one of the primary drivers of energetic electron precipitation (EEP) into the Earth's atmosphere. A problematic discrepancy has remained between the occurrence frequency of waves in magnetic local time (MLT) and the resultant precipitation observed by satellites. This study attempts to characterize the ionization profiles induced by EMIC-wave-driven EEP from ground-based measurements. Our combined observational data sets, comprising imaging riometer, atmospheric radar, and magnetometer data obtained at Syowa Station from 2016 to 2019, enable us to find more than 850 events of EMIC-driven EEP identified through concurrent ionization and EMIC wave activity. The MLT distribution of events peaks in the afternoon sector (13:00-14:00 MLT), consistent with the MLT distributions of waves previously reported. More than 60% of the events exhibit ionization above 60 km altitude caused by sub-MeV EEP, which is attributed to non-resonant scattering by EMIC waves.

引用

页数：8

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