University of Oulu

Shiokawa, K., Ozaki, M., Kadokura, A., Endo, Y., Sakanoi, T., Kurita, S., et al. (2018). Purple auroral rays and global Pc1 pulsations observed at the CIR‐associated solar wind density enhancement on 21 March 2017. Geophysical Research Letters, 45, 10,819–10,828.

Purple auroral rays and global Pc1 pulsations observed at the CIR‐associated solar wind density enhancement on 21 March 2017

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Author: Shiokawa, K.1; Ozaki, M.2; Kadokura, A.3,4,5;
Organizations: 1Nagoya Univ, Inst Space Earth Environm Res, Nagoya, Aichi, Japan
2Kanazawa Univ, Kakuma, Japan
3Natl Inst Polar Res, Tachikawa, Tokyo, Japan
4Joint Support Ctr Data Sci Res Res Org Informat &, Polar Environm Data Sci Ctr, Kanazawa, Ishikawa, Japan
5Grad Univ Adv Studies SOKENDAI, Hayama, Kanagawa, Japan
6Tohoku Univ, Grad Sch Sci, Aoba Ku, Sendai, Miyagi, Japan
7Univ Oulu, Oulu, Finland
8Athabasca Univ, Athabasca, AB, Canada
9Virginia Tech, Space VT, Bradley Dept Comp & Elect Engn, Blacksburg, VA USA.
10Natl Inst Informat & Commun Technol, Koganei, Tokyo, Japan
11Russian Acad Sci, Siberian Branch, Yu G Shafer Inst Cosmophys Res & Aeron, Yakutsk, Russia
12Russian Acad Sci, Siberian Branch, Inst Solar Terr Phys, Irkutsk, Russia
13Russian Acad Sci, Far Eastern Branch, Inst Cosmophys Res & Radio Wave Propagat IKIR, Paratunka, Russia
14Augsburg Univ, Dept Phys, Minneapolis, MN USA
15Univ Oulu, Sodankyla Geophys Observ, Sodankyla, Finland
16Kagoshima Coll, Natl Inst Technol, Kirishima, Japan
17Japan Aerosp Explorat Agcy, Tsukuba, Ibaraki, Japan
18Kyushu Inst Technol, Iizuka, Fukuoka, Japan
19Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan
20Air Force Res Lab RVBXA, Kirtland, OH USA
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2 MB)
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Language: English
Published: American Geophysical Union, 2018
Publish Date: 2019-02-22


This paper reports two unique auroral features: postmidnight purple auroral rays and global Pc1 geomagnetic pulsations, observed before the onset of the corotating interaction region (CIR) storm of 21 March 2017, at the beginning of the first campaign of the new Particles and Waves in the Inner magnetosphere using Ground‐based network observation (PWING) longitudinal ground network with the Arase satellite. The purple auroral rays were observed from ~0315 to 0430 UT (~03–04 magnetic local time) in the northeastern sky at Husafell, Iceland (magnetic latitude: 64.9°N). We newly propose that the entry of high‐density CIR plasma into the magnetotail created purple auroral rays in the sunlit ionosphere. Pc1 geomagnetic pulsations at frequencies of 0–0.5 Hz were observed after ~00 UT over a wide local time range, of 13 hr, from midnight to afternoon sectors at subauroral latitudes associated with CIR arrival. These results indicate preconditioning of the magnetosphere due to crossing of a CIR.

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Series: Geophysical research letters
ISSN: 0094-8276
ISSN-E: 1944-8007
ISSN-L: 0094-8276
Volume: 45
Issue: 20
Pages: 10,819 - 10,828
DOI: 10.1029/2018GL079103
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: Support for the MACCS magnetometer data is provided by grant AGS‐1651263 from the U.S. National Science Foundation. This work is supported by the JSPS KAKENHI (15H05747, 15H05815, and 16H06286). This work is supported by the Ministry of Science and Higher Education of the Russian Federation and the Siberian Branch of the Russian Academy of Sciences (Project II.16.2.1, registration number AAAA‐A17‐117021450059‐3; DGB).
Copyright information: ©2018. American Geophysical Union.