First evidence of patchy flickering aurora modulated by multi-ion electromagnetic ion cyclotron waves
First evidence of patchy flickering aurora modulated by multi-ion electromagnetic ion cyclotron waves
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.
3963-3970
Fukuda, Yoko
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Kataoka, Ryuho
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Uchida, Herbert Akihito
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Miyoshi, Yoshizumi
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Hampton, Donald
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Shiokawa, Kazuo
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Ebihara, Yusuke
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Whiter, Daniel
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Iwagami, Naomoto
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Seki, Kanako
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16 May 2017
Fukuda, Yoko
92521162-a18b-4f91-ba95-b01003d67671
Kataoka, Ryuho
450a2b7e-f15d-4896-ae05-66b61e3a4850
Uchida, Herbert Akihito
1780d879-d5c3-45f8-a0cf-9d8f62d4fcd5
Miyoshi, Yoshizumi
c14f7402-1972-43c8-910e-bd4a2a9777e0
Hampton, Donald
319c48aa-56a1-47bf-ba9c-7648a1652da3
Shiokawa, Kazuo
cfc83a88-ce34-45bf-9683-7721e31273fa
Ebihara, Yusuke
c666ff32-433a-49f5-b2be-9284392a4b80
Whiter, Daniel
9a30d7b6-ea41-44fb-bd52-3ff1964eca5c
Iwagami, Naomoto
61baaf08-180a-422d-9ae8-806c23fb9058
Seki, Kanako
a28c6fb9-68a1-4a99-b2cb-2d029f5823a4
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), .
(doi:10.1002/2017GL072956).
Abstract
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.
Text
Fukuda_et_al-2017-Geophysical_Research_Letters
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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
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Local EPrints ID: 411138
URI: http://eprints.soton.ac.uk/id/eprint/411138
ISSN: 1944-8007
PURE UUID: 2a9f4fa8-c73f-4648-ba76-2b84e071e7f2
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Date deposited: 14 Jun 2017 16:31
Last modified: 16 Mar 2024 05:20
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Contributors
Author:
Yoko Fukuda
Author:
Ryuho Kataoka
Author:
Herbert Akihito Uchida
Author:
Yoshizumi Miyoshi
Author:
Donald Hampton
Author:
Kazuo Shiokawa
Author:
Yusuke Ebihara
Author:
Naomoto Iwagami
Author:
Kanako Seki
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