A direct link between chorus emissions and pulsating aurora on timescales from milliseconds to minutes: A case study at subauroral latitudes

Ozaki, Mitsunori; Yagitani, Satoshi; Sawai, Kaoru; Shiokawa, Kazuo; Miyoshi, Yoshizumi; Kataoka, Ryuho; Ieda, Akimasa; Ebihara, Yusuke; Connors, Martin; Schofield, Ian; Katoh, Yuto; Otsuka, Yuichi; Sunagawa, Naoki; Jordanova, Vania K.

doi:10.1002/2015JA021381

A direct link between chorus emissions and pulsating aurora on timescales from milliseconds to minutes: A case study at subauroral latitudes

Journal Article · Fri Nov 27 00:00:00 EST 2015 · Journal of Geophysical Research. Space Physics

DOI:https://doi.org/10.1002/2015JA021381· OSTI ID:1236714

Ozaki, Mitsunori ^[1]; Yagitani, Satoshi ^[1]; Sawai, Kaoru ^[1]; Shiokawa, Kazuo ^[2]; Miyoshi, Yoshizumi ^[2]; Kataoka, Ryuho ^[3]; Ieda, Akimasa ^[2]; Ebihara, Yusuke ^[4]; Connors, Martin ^[5]; Schofield, Ian ^[5]; Katoh, Yuto ^[6]; Otsuka, Yuichi ^[2]; Sunagawa, Naoki ^[2]; Jordanova, Vania K. ^[7]

Kanazawa Univ., Kanazawa (Japan)
Nagoya Univ., Nagoya (Japan)
National Institute of Polar Research, Tachikawa (Japan); Graduate Univ. for Advanced Studies (SOKENDAI), Tachikawa (Japan)
Kyoto Univ., Uji (Japan)
Athabasca Univ., Athabasca (Canada)
Tohoku Univ., Sendai (Japan)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

A correlation was observed between chorus emissions and pulsating aurora (PA) from observations at Athabasca (L ≈ 4.3) in Canada at 9:00–9:20 UT on 7 February 2013, using an electron multiplying charge-coupled device camera and a VLF loop antenna with sampling rates of 110 Hz and 100 kHz, respectively. Pulsating aurora having a quasiperiodic variation in luminosity and a few hertz modulation was observed together with chorus emissions consisting of a group of successive rising-tone elements. The repetition period and modulation frequency of the PA are in good agreement with those of the modulated chorus. After 9:11 UT, the temporal features of the aurora became aperiodic PA of indistinct modulation. Simultaneously, the rising-tone chorus turned into chorus emissions consisting of numerous rising-tone elements. The equatorial geomagnetic field inhomogeneity calculated using the Tsyganenko 2002 model shows a decreasing trend during the period. This result is consistent with nonlinear wave growth theory having a small geomagnetic field inhomogeneity, which contributes to a decrease in the threshold amplitude to trigger discrete chorus elements. As a result, these observations show a close connection between chorus emissions and PA on timescales from milliseconds for generation of discrete chorus elements on the microphysics of wave-particle interaction to minutes for the variations of the geomagnetic field inhomogeneity related with the substorm activity.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1236714

Alternate ID(s):: OSTI ID: 1402312

Report Number(s):: LA-UR--15-23109

Journal Information:: Journal of Geophysical Research. Space Physics, Journal Name: Journal of Geophysical Research. Space Physics Journal Issue: 11 Vol. 120; ISSN 2169-9380

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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