@article{139e2c102cda46f680b5ba85e27a5575,
title = "Purple Auroral Rays and Global Pc1 Pulsations Observed at the CIR-Associated Solar Wind Density Enhancement on 21 March 2017",
abstract = "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.",
keywords = "Arase satellite, CIR storm, EMIC wave, PWING project, Pc1 pulsation, purple aurora",
author = "K. Shiokawa and M. Ozaki and A. Kadokura and Y. Endo and T. Sakanoi and S. Kurita and Y. Miyoshi and Oyama, {S. I.} and M. Connors and I. Schofield and Ruohoniemi, {J. M.} and M. No{\'s}e and T. Nagatsuma and K. Sakaguchi and Baishev, {D. G.} and A. Pashinin and R. Rakhmatulin and B. Shevtsov and I. Poddelsky and M. Engebretson and Tero Raita and Tanaka, {Y. M.} and M. Shinohara and M. Teramoto and R. Nomura and A. Fujimoto and A. Matsuoka and N. Higashio and T. Takashima and I. Shinohara and Albert, {Jay M.}",
note = "Funding Information: The OMNI database was provided by https://omniweb.gsfc.nasa.gov/ow. html. The Arase XEP data processing was partly supported by the SEES/JAXA. Science data of the ERG (Arase) satellite were obtained from the ERG Science Center operated by ISAS/JAXA and ISEE/Nagoya University (http://ergsc. isee.nagoya-u.ac.jp/). The Arase satellite data will be publicly available via ERG Science Center on a project-agreed schedule. Support for the MACCS magnetometer data is provided by grant AGS-1651263 from the U.S. National Science Foundation. The present study analyzed fluxgate magnetometer v02.01 data generated on 28 July 2018. The present study analyzed XEP v001 data generated on 6 January 2018 and 8 August 2017 for 20 and 21 March 2017 data, respectively. 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). Observations at HUS were carried out under an agreement of cooperation between the Science Institute, University of Iceland (SIUI), and National Institute of Polar Research, Japan. Special thanks are due to Gunnlaugur Bjornsson in SIUI. The database construction for the PWING ground-based instruments is supported by the ERG Science Center (http://ergsc. isee.nagoya-u.ac.jp/) and the IUGONET (Inter-university Upper atmosphere Global Observation NETwork) project (http://www.iugonet.org/). Funding Information: The OMNI database was provided by https://omniweb.gsfc.nasa.gov/ow.html. The Arase XEP data processing was partly supported by the SEES/JAXA. Science data of the ERG (Arase) satellite were obtained from the ERG Science Center operated by ISAS/JAXA and ISEE/Nagoya University (http://ergsc.isee.nagoya-u.ac.jp/). The Arase satellite data will be publicly available via ERG Science Center on a project-agreed schedule. Support for the MACCS magnetometer data is provided by grant AGS-1651263 from the U.S. National Science Foundation. The present study analyzed fluxgate magnetometer v02.01 data generated on 28 July 2018. The present study analyzed XEP v001 data generated on 6 January 2018 and 8 August 2017 for 20 and 21 March 2017 data, respectively. 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). Observations at HUS were carried out under an agreement of cooperation between the Science Institute, University of Iceland (SIUI), and National Institute of Polar Research, Japan. Special thanks are due to Gunnlaugur Bjornsson in SIUI. The database construction for the PWING ground-based instruments is supported by the ERG Science Center (http://ergsc.isee.nagoya-u.ac.jp/) and the IUGONET (Inter-university Upper atmosphere Global Observation NETwork) project (http://www.iugonet.org/). Publisher Copyright: {\textcopyright}2018. American Geophysical Union. All Rights Reserved.",
year = "2018",
month = oct,
day = "28",
doi = "10.1029/2018GL079103",
language = "English",
volume = "45",
pages = "10,819--10,828",
number = "20",
}