Fast modulations of pulsating proton aurora related to subpacket structures of Pc1 geomagnetic pulsations at subauroral latitudes

被引：13

作者：

Ozaki, M. ^{[1
]}

Shiokawa, K. ^{[2
]}

Miyoshi, Y. ^{[2
]}

Kataoka, R. ^{[3
,4
]}

Yagitani, S. ^{[1
]}

Inoue, T. ^{[1
]}

Ebihara, Y. ^{[5
]}

Jun, C. -W ^{[2
]}

Nomura, R. ^{[6
]}

Sakaguchi, K. ^{[7
]}

Otsuka, Y. ^{[2
]}

Shoji, M. ^{[2
]}

Schofield, I. ^{[8
]}

Connors, M. ^{[8
]}

Jordanova, V. K. ^{[9
]}

机构：

[1] Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa, Japan

[2] Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan

[3] Natl Inst Polar Res, Tachikawa, Tokyo, Japan

[4] Grad Univ Adv Studies SOKENDAI, Dept Polar Sci, Tachikawa, Tokyo, Japan

[5] Kyoto Univ, Res Inst Sustainable Humanosphere, Uji, Kyoto, Japan

[6] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan

[7] Natl Inst Informat & Commun Technol, Koganei, Tokyo, Japan

[8] Athabasca Univ, Ctr Sci, Athabasca, AB, Canada

[9] Los Alamos Natl Lab, Los Alamos, NM USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2016年 / 43卷 / 15期

基金：

日本学术振兴会; 加拿大创新基金会;

关键词：

pulsating proton aurora; Pc1 geomagnetic pulsations; subpacket structure; fast modulation; wave-particle interactions; ION-CYCLOTRON WAVES; 1-2 MAGNETIC PULSATIONS; DAWN-DUSK ASYMMETRY; EQUATORIAL MAGNETOSPHERE; EMIC WAVES; EMISSIONS; MODEL; PRECIPITATION; PERIOD;

D O I：

10.1002/2016GL070008

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

To understand the role of electromagnetic ion cyclotron (EMIC) waves in determining the temporal features of pulsating proton aurora (PPA) via wave-particle interactions at subauroral latitudes, high-time-resolution (1/8s) images of proton-induced N-2(+) emissions were recorded using a new electron multiplying charge-coupled device camera, along with related Pc1 pulsations on the ground. The observed Pc1 pulsations consisted of successive rising-tone elements with a spacing for each element of 100s and subpacket structures, which manifest as amplitude modulations with a period of a few tens of seconds. In accordance with the temporal features of the Pc1 pulsations, the auroral intensity showed a similar repetition period of 100s and an unpredicted fast modulation of a few tens of seconds. These results indicate that PPA is generated by pitch angle scattering, nonlinearly interacting with Pc1/EMIC waves at the magnetic equator.

引用

页码：7859 / 7866

页数：8

共 13 条

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[J]. ATMOSPHERE, 2024, 15 (02)

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