Observation of pulsating aurora signatures in cosmic noise absorption data

被引：20

作者：

Grandin, M. ^{[1
,2
]}

Kero, A. ^{[1
]}

Partamies, N. ^{[3
,4
]}

McKay, D. ^{[1
,5
]}

Whiter, D. ^{[6
]}

Kozlovsky, A. ^{[1
]}

Miyoshi, Y. ^{[7
]}

机构：

[1] Univ Oulu, Sodankyla Geophys Observ, Sodankyla, Finland

[2] Univ Toulouse, CNRS, IRAP, UPS,CNES, Toulouse, France

[3] Univ Ctr Svalbard, Dept Arctic Geophys, Longyearbyen, Norway

[4] Birkeland Ctr Space Sci, Bergen, Norway

[5] Univ Tromso, Dept Phys & Technol, Tromso, Norway

[6] Univ Southampton, Space Environm Phys, Southampton, Hants, England

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

来源：

GEOPHYSICAL RESEARCH LETTERS | 2017年 / 44卷 / 11期

关键词：

pulsating aurora; energetic electron precipitation; optical data; riometer; cosmic noise absorption; high-latitude ionosphere; WHISTLER-MODE CHORUS; ELECTRONS; SUBSTORM; WAVES; PRECIPITATION; MODULATION; MORPHOLOGY; PATCHES; PHASE;

D O I：

10.1002/2017GL073901

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

This study investigates the contribution of energetic (E > 30keV) particle precipitation during a pulsating aurora event over Kilpisjarvi (L = 6.2) on 26February2014. It is based on the comparison of auroral blue-line emission (427.8nm) data from an all-sky camera and cosmic noise absorption (CNA) data obtained from a multibeam experiment of the Kilpisjarvi Atmospheric Imaging Receiver Array (KAIRA) riometer. The data sets are compared for three KAIRA beams close to magnetic zenith. Results show a clear correlation between the measured CNA and the auroral blue-line emission during the event, for each beam. In addition, individual pulsations are observed for the first time in the cosmic noise absorption data measured by KAIRA and are found to be close-to-identical to the optical pulsations. This suggests that the modulation of electron precipitation during pulsating aurora takes place in a consistent way over a broad range of energies.

引用

页码：5292 / 5300

页数：9

共 41 条

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