Microscopic Observations of Pulsating Aurora Associated With Chorus Element Structures: Coordinated Arase Satellite-PWING Observations

M. Ozaki; K. Shiokawa; Y. Miyoshi; K. Hosokawa; S. Oyama; S. Yagitani; Y. Kasahara; Y. Kasaba; S. Matsuda; R. Kataoka; Y. Ebihara; Y. Ogawa; Y. Otsuka; S. Kurita; R. C. Moore; Y. M. Tanaka; M. Nosé; T. Nagatsuma; M. Connors; N. Nishitani; Y. Katoh; M. Hikishima; A. Kumamoto; F. Tsuchiya; A. Kadokura; T. Nishiyama; T. Inoue; K. Imamura; A. Matsuoka; I. Shinohara

doi:10.1029/2018GL079812

Microscopic Observations of Pulsating Aurora Associated With Chorus Element Structures: Coordinated Arase Satellite-PWING Observations

M. Ozaki, K. Shiokawa, Y. Miyoshi, K. Hosokawa, S. Oyama, S. Yagitani, Y. Kasahara, Y. Kasaba, S. Matsuda, R. Kataoka, Y. Ebihara, Y. Ogawa, Y. Otsuka, S. Kurita, R. C. Moore, Y. M. Tanaka, M. Nosé, T. Nagatsuma, M. Connors, N. NishitaniY. Katoh, M. Hikishima, A. Kumamoto, F. Tsuchiya, A. Kadokura, T. Nishiyama, T. Inoue, K. Imamura, A. Matsuoka, I. Shinohara

Centre for Science

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29 Citations (Scopus)

Abstract

Rapid (<1 s) intensity modulation of pulsating auroras is caused by successive chorus elements as a response to wave-particle interactions in the magnetosphere. Here we found that a pulsating auroral patch responds to the time spacing for successive chorus elements and possibly to chorus subpacket structures with a time scale of tens of milliseconds. These responses were identified from coordinated Arase satellite and ground (Gakona, Alaska) observations with a high-speed auroral imager (100 Hz). The temporal variations of auroral intensity in a few-hertz frequency range exhibited a spatial concentration at the lower-latitude edge of the auroral patch. The spatial evolution of the auroral patch showed repeated expansion/contraction with tens of kilometer scales in the ionosphere, which could be spatial behaviors in the wave-particle interactions. These observations indicate that chorus elements evolve coherently within the auroral patch, which is approximately 900 km in the radial and longitudinal directions at the magnetic equator.

Original language	English
Pages (from-to)	12,125-12,134
Journal	Geophysical Research Letters
Volume	45
Issue number	22
DOIs	https://doi.org/10.1029/2018GL079812
Publication status	Published - 28 Nov. 2018

Keywords

Arase satellite
discrete chorus element
ground-based observation network
pulsating aurora
wave-particle interaction

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10.1029/2018GL079812

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Ozaki, M., Shiokawa, K., Miyoshi, Y., Hosokawa, K., Oyama, S., Yagitani, S., Kasahara, Y., Kasaba, Y., Matsuda, S., Kataoka, R., Ebihara, Y., Ogawa, Y., Otsuka, Y., Kurita, S., Moore, R. C., Tanaka, Y. M., Nosé, M., Nagatsuma, T., Connors, M., ... Shinohara, I. (2018). Microscopic Observations of Pulsating Aurora Associated With Chorus Element Structures: Coordinated Arase Satellite-PWING Observations. Geophysical Research Letters, 45(22), 12,125-12,134. https://doi.org/10.1029/2018GL079812

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title = "Microscopic Observations of Pulsating Aurora Associated With Chorus Element Structures: Coordinated Arase Satellite-PWING Observations",

abstract = "Rapid (<1 s) intensity modulation of pulsating auroras is caused by successive chorus elements as a response to wave-particle interactions in the magnetosphere. Here we found that a pulsating auroral patch responds to the time spacing for successive chorus elements and possibly to chorus subpacket structures with a time scale of tens of milliseconds. These responses were identified from coordinated Arase satellite and ground (Gakona, Alaska) observations with a high-speed auroral imager (100 Hz). The temporal variations of auroral intensity in a few-hertz frequency range exhibited a spatial concentration at the lower-latitude edge of the auroral patch. The spatial evolution of the auroral patch showed repeated expansion/contraction with tens of kilometer scales in the ionosphere, which could be spatial behaviors in the wave-particle interactions. These observations indicate that chorus elements evolve coherently within the auroral patch, which is approximately 900 km in the radial and longitudinal directions at the magnetic equator.",

keywords = "Arase satellite, discrete chorus element, ground-based observation network, pulsating aurora, wave-particle interaction",

author = "M. Ozaki and K. Shiokawa and Y. Miyoshi and K. Hosokawa and S. Oyama and S. Yagitani and Y. Kasahara and Y. Kasaba and S. Matsuda and R. Kataoka and Y. Ebihara and Y. Ogawa and Y. Otsuka and S. Kurita and Moore, {R. C.} and Tanaka, {Y. M.} and M. Nos{\'e} and T. Nagatsuma and M. Connors and N. Nishitani and Y. Katoh and M. Hikishima and A. Kumamoto and F. Tsuchiya and A. Kadokura and T. Nishiyama and T. Inoue and K. Imamura and A. Matsuoka and I. Shinohara",

year = "2018",

month = nov,

day = "28",

doi = "10.1029/2018GL079812",

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Ozaki, M, Shiokawa, K, Miyoshi, Y, Hosokawa, K, Oyama, S, Yagitani, S, Kasahara, Y, Kasaba, Y, Matsuda, S, Kataoka, R, Ebihara, Y, Ogawa, Y, Otsuka, Y, Kurita, S, Moore, RC, Tanaka, YM, Nosé, M, Nagatsuma, T, Connors, M, Nishitani, N, Katoh, Y, Hikishima, M, Kumamoto, A, Tsuchiya, F, Kadokura, A, Nishiyama, T, Inoue, T, Imamura, K, Matsuoka, A & Shinohara, I 2018, 'Microscopic Observations of Pulsating Aurora Associated With Chorus Element Structures: Coordinated Arase Satellite-PWING Observations', Geophysical Research Letters, vol. 45, no. 22, pp. 12,125-12,134. https://doi.org/10.1029/2018GL079812

TY - JOUR

T1 - Microscopic Observations of Pulsating Aurora Associated With Chorus Element Structures

T2 - Coordinated Arase Satellite-PWING Observations

AU - Ozaki, M.

AU - Shiokawa, K.

AU - Miyoshi, Y.

AU - Hosokawa, K.

AU - Oyama, S.

AU - Yagitani, S.

AU - Kasahara, Y.

AU - Kasaba, Y.

AU - Matsuda, S.

AU - Kataoka, R.

AU - Ebihara, Y.

AU - Ogawa, Y.

AU - Otsuka, Y.

AU - Kurita, S.

AU - Moore, R. C.

AU - Tanaka, Y. M.

AU - Nosé, M.

AU - Nagatsuma, T.

AU - Connors, M.

AU - Nishitani, N.

AU - Katoh, Y.

AU - Hikishima, M.

AU - Kumamoto, A.

AU - Tsuchiya, F.

AU - Kadokura, A.

AU - Nishiyama, T.

AU - Inoue, T.

AU - Imamura, K.

AU - Matsuoka, A.

AU - Shinohara, I.

PY - 2018/11/28

Y1 - 2018/11/28

N2 - Rapid (<1 s) intensity modulation of pulsating auroras is caused by successive chorus elements as a response to wave-particle interactions in the magnetosphere. Here we found that a pulsating auroral patch responds to the time spacing for successive chorus elements and possibly to chorus subpacket structures with a time scale of tens of milliseconds. These responses were identified from coordinated Arase satellite and ground (Gakona, Alaska) observations with a high-speed auroral imager (100 Hz). The temporal variations of auroral intensity in a few-hertz frequency range exhibited a spatial concentration at the lower-latitude edge of the auroral patch. The spatial evolution of the auroral patch showed repeated expansion/contraction with tens of kilometer scales in the ionosphere, which could be spatial behaviors in the wave-particle interactions. These observations indicate that chorus elements evolve coherently within the auroral patch, which is approximately 900 km in the radial and longitudinal directions at the magnetic equator.

AB - Rapid (<1 s) intensity modulation of pulsating auroras is caused by successive chorus elements as a response to wave-particle interactions in the magnetosphere. Here we found that a pulsating auroral patch responds to the time spacing for successive chorus elements and possibly to chorus subpacket structures with a time scale of tens of milliseconds. These responses were identified from coordinated Arase satellite and ground (Gakona, Alaska) observations with a high-speed auroral imager (100 Hz). The temporal variations of auroral intensity in a few-hertz frequency range exhibited a spatial concentration at the lower-latitude edge of the auroral patch. The spatial evolution of the auroral patch showed repeated expansion/contraction with tens of kilometer scales in the ionosphere, which could be spatial behaviors in the wave-particle interactions. These observations indicate that chorus elements evolve coherently within the auroral patch, which is approximately 900 km in the radial and longitudinal directions at the magnetic equator.

KW - Arase satellite

KW - discrete chorus element

KW - ground-based observation network

KW - pulsating aurora

KW - wave-particle interaction

UR - http://www.scopus.com/inward/record.url?scp=85057344088&partnerID=8YFLogxK

U2 - 10.1029/2018GL079812

DO - 10.1029/2018GL079812

M3 - Journal Article

AN - SCOPUS:85057344088

SN - 0094-8276

VL - 45

SP - 12,125-12,134

JO - Geophysical Research Letters

JF - Geophysical Research Letters

IS - 22

ER -

Microscopic Observations of Pulsating Aurora Associated With Chorus Element Structures: Coordinated Arase Satellite-PWING Observations

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Keywords

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