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First evidence of patchy flickering aurora modulated by multi-ion electromagnetic ion cyclotron waves

Fukuda, Yoko, Kataoka, Ryuho, Uchida, Herbert Akihito, Miyoshi, Yoshizumi, Hampton, Donald, Shiokawa, Kazuo, Ebihara, Yusuke, Whiter, Daniel, Iwagami, Naomoto and Seki, Kanako (2017) First evidence of patchy flickering aurora modulated by multi-ion electromagnetic ion cyclotron waves Geophysical Research Letters, 44, (9), pp. 3963-3970. (doi:10.1002/2017GL072956).

Record type: Article


Electromagnetic ion cyclotron (EMIC) waves, one of the possible origins of flickering aurora, have been thought to modulate the electron flux at a few thousand kilometers. In fact, flickering aurora with a frequency range of 3–15 Hz has often been identified by ground-based optical observations and has been interpreted to be caused by O+-band EMIC waves. However, extant research to date has not identified possible signatures of H+-band EMIC waves due to technical limitations of ground-based high-speed imagers. The present study shows the first evidence that patchy flickering aurora could be modulated by H+-band EMIC waves, based on the data obtained from imaging observations at 160 frames per second. The sporadic appearance of the flickering aurora in the frequency range of 50–80 Hz coexisted with typical flickering auroras of approximately 10 Hz. These results are consistent with the hypothesis that flickering auroras are generated by multi-ion EMIC waves.

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Accepted/In Press date: 23 April 2017
e-pub ahead of print date: 13 May 2017
Published date: 16 May 2017
Organisations: Physics & Astronomy


Local EPrints ID: 411138
ISSN: 1944-8007
PURE UUID: 2a9f4fa8-c73f-4648-ba76-2b84e071e7f2
ORCID for Daniel Whiter: ORCID iD

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Date deposited: 14 Jun 2017 16:31
Last modified: 12 Aug 2017 16:31

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Author: Yoko Fukuda
Author: Ryuho Kataoka
Author: Herbert Akihito Uchida
Author: Yoshizumi Miyoshi
Author: Donald Hampton
Author: Kazuo Shiokawa
Author: Yusuke Ebihara
Author: Daniel Whiter ORCID iD
Author: Naomoto Iwagami
Author: Kanako Seki

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