Japan Geoscience Union Meeting 2016

Presentation information

International Session (Oral)

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

[P-EM08] Inner magnetosphere: Latest results and new perspectives

Mon. May 23, 2016 10:45 AM - 12:10 PM 103 (1F)

Convener:*Danny Summers(Memorial University of Newfoundland), Yusuke Ebihara(Research Institute for Sustainable Humanosphere, Kyoto University), Yoshizumi Miyoshi(Institute for Space-Earth Environmental Research, Nagoya University), Chair:Danny Summers(Dept of Math and Stats,Memorial University of NewfoundlandInstitute for Space-Earth Environmental Research, Nagoya University)

11:55 AM - 12:10 PM

[PEM08-05] Relation between the ionospheric convection observed by the SuperDARN Hokkaido Paif of (HOP) radars and low-latitude auroras

*Nozomu Nishitani1, Tomoaki Hori1, Ryuho Kataoka2, Yusuke Ebihara3, Kazuo Shiokawa1, Yuichi Otsuka1, Hidehiko Suzuki4 (1.Institute for Space-Earth Environmental Research, Nagoya University, 2.National Institute of Polar Research, 3.Research Institute of Sustainable Humanosphere, Kyoto University, 4.Meiji University)

Keywords:SuperDARN Hokkaido Pair of (HOP) radars, low-latitude auroras, mid-latitude / subauroral latitude ionospheric convection

Recent SuperDARN deployment toward lower latitudes made it possible to study ionospheric convection associated with low-latitude auroras (up to below 50 degrees geomagnetic latitude) with high temporal resolution (1 min). In this paper we report on the relationship between the appearance of low-latitude auroras for a few geomagnetic storm events (such as that on March 17, 2015 and on December 21, 2015) and ionospheric convection observed by the SuperDARN Hokkaido Pair of (HOP) radars. Associated with low-latitude auroral emission in the postmidnight sector, there was a sheared flow structure with westward flow equatorward of eastward flow, with the equatorward boundary of auroral emission embedded in the westward flow region. Such kind of flow distribution was also observed with other events such as that on January 20, 2016. The observations suggest that the presence of electric field distribution plays some roles in keeping low latitude auroral emission. Detailed discussion of the relationship between the low latitude auroras and the electric field distribution will be presented.