A direct link between chorus emissions and pulsating aurora on timescales from milliseconds to minutes: A case study at subauroral latitudes
Abstract
Abstract 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. 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 ofmore »
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1236714
- Alternate Identifier(s):
- OSTI ID: 1402312
- Report Number(s):
- LA-UR-15-23109
Journal ID: ISSN 2169-9380
- Grant/Contract Number:
- 23403009, 25247080, 25302006, 15H03732, 15H05747, 15H05815; NNG13PJ05I; AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Space Physics
- Additional Journal Information:
- Journal Volume: 120; Journal Issue: 11; Journal ID: ISSN 2169-9380
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES
Citation Formats
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, and Jordanova, Vania K. A direct link between chorus emissions and pulsating aurora on timescales from milliseconds to minutes: A case study at subauroral latitudes. United States: N. p., 2015.
Web. doi:10.1002/2015JA021381.
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. A direct link between chorus emissions and pulsating aurora on timescales from milliseconds to minutes: A case study at subauroral latitudes. United States. https://doi.org/10.1002/2015JA021381
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, and Jordanova, Vania K. Fri .
"A direct link between chorus emissions and pulsating aurora on timescales from milliseconds to minutes: A case study at subauroral latitudes". United States. https://doi.org/10.1002/2015JA021381. https://www.osti.gov/servlets/purl/1236714.
@article{osti_1236714,
title = {A direct link between chorus emissions and pulsating aurora on timescales from milliseconds to minutes: A case study at subauroral latitudes},
author = {Ozaki, Mitsunori and Yagitani, Satoshi and Sawai, Kaoru and Shiokawa, Kazuo and Miyoshi, Yoshizumi and Kataoka, Ryuho and Ieda, Akimasa and Ebihara, Yusuke and Connors, Martin and Schofield, Ian and Katoh, Yuto and Otsuka, Yuichi and Sunagawa, Naoki and Jordanova, Vania K.},
abstractNote = {Abstract 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. 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.},
doi = {10.1002/2015JA021381},
journal = {Journal of Geophysical Research. Space Physics},
number = 11,
volume = 120,
place = {United States},
year = {Fri Nov 27 00:00:00 EST 2015},
month = {Fri Nov 27 00:00:00 EST 2015}
}
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