Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM16] Dynamics of Earth's Inner Magnetosphere and Initial Results from Arase

Mon. May 21, 2018 1:45 PM - 3:15 PM 303 (3F International Conference Hall, Makuhari Messe)

convener:Danny Summers(Memorial University of Newfoundland), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Keisuke Hosokawa(電気通信大学大学院情報理工学研究科, 共同), Yusuke Ebihara(Research Institute for Sustainable Humanosphere, Kyoto University), Chairperson:Miyoshi Yoshizumi(ISEE, Nagoya University)

2:00 PM - 2:15 PM

[PEM16-08] Postmidnight purple auroral rays and longitudinally-wide Pc1 pulsations observed at the CIR-associated solar-wind density enhancement on March 21, 2017

★Invited Papers

*Kazuo Shiokawa1, Mitsunori Ozaki2, Akira Kadokura3, Yu Endo4, Takeshi Sakanoi4, Satoshi Kurita1, Yoshizumi Miyoshi1, Shin-ichiro Oyama1, Ian Schofield5, Martin Connors5, J. Michael Ruohoniemi6, D. G. Baishev7, A Pashinin8, B Shevtsov9, Igor Poddelsky9, Mark Engebretson13, Tero Raita14, Yoshimasa Tanaka3, Iku Shinohara10, Mariko Teramoto1, Reiko Nomura11, Akiko Fujimoto12, Ayako Matsuoka10, Nana Higashio11, Takeshi Takashima10 (1.Institute for Space-Earth Environmental Research, Nagoya University, 2.Kanazawa University, 3.National Institute of Polar Research, 4.Tohoku University, 5.Athabasca University, 6.Virginia Tech, 7.Yu.G.Shafer Institute of Cosmophysical Research and Aeronomy (IKFIA), SB RAS, 8.Institute of Solar-Terrestrial Physics (ISTP), SB RAS, 9.Institute of Cosmophysical Researches and Radio Wave Propagation (IKIR), FEB RAS, 10.Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), 11.Japan Aerospace Exploration Agency (JAXA), 12.International Center for Space Weather Science and Education (ICSWSE), Kyushu University, 13.Augsburg University, 14.Sodankylä Geophysical Observatory)

Keywords:geomagnetic storm, Corotating Interaction Region (CIR), purple auroral ray, Pc1 geomagnetic pulsation

Corotating Interaction Regions (CIR) associated with the high-speed solar wind from solar coronal holes are one of the outstanding structures in the solar wind that can cause geomagnetic storms. This paper reports two unique features, i.e., postmidnight purple auroral rays and global Pc1 geomagnetic pulsations, observed at the beginning of the CIR storm of March 21, 2017, based on the first campaign observation of our new (PWING) longitudinal ground network with the Arase satellite. The purple auroral rays were observed at ~0315-0430 UT (~03-04 magnetic local time) in the northeastern sky at Husafell, Iceland (magnetic latitude: 64.9oN). We suggest that the entry of high-density solar-wind plasma into the magnetotail caused the purple auroral rays in the sunlit ionosphere. The Pc1 geomagnetic pulsations at frequencies of 0-0.5 Hz were observed after ~00 UT over a wide longitudinal range of 13 hours of local times from midnight to afternoon sectors at subauroral latitudes associated with the CIR arrival.