University of Oulu

Ozaki, M., Shiokawa, K., Miyoshi, Y., Hosokawa, K., Oyama, S., Yagitani, S., et al. (2018). Microscopic observations of pulsating aurora associated with chorus element structures: Coordinated Arase satellite‐PWING observations. Geophysical Research Letters, 45, 12,125–12,134. https://doi.org/10.1029/2018GL079812

Microscopic observations of pulsating aurora associated with chorus element structures : coordinated arase aatellite‐PWING observations

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Author: Ozaki, M.1; Shiokawa, K.2; Miyoshi, Y.2;
Organizations: 1Kanazawa Univ, Grad Sch Nat Sci & Technol, Kanazawa, Ishikawa, Japan
2Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan
3Univ Electrocommun, Grad Sch Informat & Engn, Chofu, Tokyo, Japan
4Univ Oulu, Ionosphere Res Unit, Oulu, Finland
5Natl Inst Polar Res, Tachikawa, Tokyo, Japan
6Tohoku Univ, Grad Sch Sci, Sendai, Miyagi, Japan
7Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Tokyo, Japan
8Grad Univ Adv Studies SOKENDAI, Dept Polar Sci, Tachikawa, Tokyo, Japan
9Kyoto Univ, Res Inst Sustainable Elumanosphere, Kyoto, Japan
10Univ Florida, Dept Elect & Comp Engn, Gainesville, FL USA
11Res Org Informat & Syst, Joint Support Ctr Data Sci Res, Tokyo, Japan
12Natl Inst Informat & Commun Technol, Tokyo, Japan
13Athabasca Univ, Ctr Sci, Athabasca, AB, Canada
Format: article
Version: published version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe201902226069
Language: English
Published: American Geophysical Union, 2018
Publish Date: 2019-05-26
Description:

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.

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Series: Geophysical research letters
ISSN: 0094-8276
ISSN-E: 1944-8007
ISSN-L: 0094-8276
Volume: 45
Issue: 22
Pages: 12,125 - 12,134
DOI: 10.1029/2018GL079812
OADOI: https://oadoi.org/10.1029/2018GL079812
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Subjects:
Funding: MEXT | Japan Society for the Promotion of Science (JSPS), International Space Science Institute‐Beijing (ISSI‐BJ) International team program, IUGONET (Inter‐university Upper atmosphere Global Observation NETwork) project, JSPS Bilateral Open Partnership Joint Research Projects, Kanazawa University SAKIGAKE project, JSPS KAKENHI. Grant Numbers: JP17K06456, JP17H06140, JP16H04056, JP16H06286, JP15H05815, JP15H05747, JP14J02108, JP17K05668, JP18H03727.
Copyright information: © 2018. American Geophysical Union. All Rights Reserved.