JpGU-AGU Joint Meeting 2017

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[EE] Oral

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

[P-EM14] [EE] Dynamics in magnetosphere and ionosphere

Sat. May 20, 2017 1:45 PM - 3:15 PM 105 (International Conference Hall 1F)

convener:Tomoaki Hori(Graduate school of Science, University of Tokyo), Yoshimasa Tanaka(National Institute of Polar Research), Aoi Nakamizo(Applied Electromagnetic Research Institute, National Institute of Information and Communications Technology), Mitsunori Ozaki(Faculty of Electrical and Computer Engineering, Institute of Science and Engineering, Kanazawa University), Chairperson:Motoharu Nowada(Shandong University), Chairperson:shun Imajo(Kyushu Univ.)

2:05 PM - 2:20 PM

[PEM14-02] Dynamics of the ionospheric convection during disturbed periods observed by the mid-latitude SuperDARN radars

*Nozomu Nishitani1, Tomoaki Hori2, Joseph B.H. Baker3,1 (1.Institute for Space-Earth Environmental Research, Nagoya University, 2.Graduate school of Science, University of Tokyo, 3.Virginia Tech)

Keywords:SuperDARN Hokkaido Pair of (HOP) radars, ionospheric convection, geomagnetically disturbed periods, Sub-Auroral Polarization Streams (SAPS)

Sub-Auroral Polarization Streams (SAPS) are one of the main disturbance signatures in the ionospheric convection at subauroral latitudes. Their generation is related to a wide variety of factors such as ring current distribution, solar wind / magnetospheric conditions, ionospheric conductivity etc. In this paper we discuss one event of the SAPS signature observed by the SuperDARN Hokkaido East radar on April 5, 2012. Simultaneously with the enhancement / decay of the SAPS, the mid-latitude SuperDARN radars in the North America observed the corresponding intensification / weakening of the convective flows in the postmidnight sector. There is no obvious solar wind / IMF condition changes, or substorm / storm developments directly related to the convection enhancements. This suggests that the SAPS might be generated in the framework of the global convection, not triggered by a simple factor. Results of detailed discussion / interpretation will be presented.