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-EM09] Study of coupling processes in solar-terrestrial system

Mon. May 23, 2016 10:45 AM - 12:15 PM 106 (1F)

Convener:*Mamoru Yamamoto(Research Institute for Sustainable Humanosphere, Kyoto University), Satonori Nozawa(Institute for Space-Earth Environment Research), Yasunobu Ogawa(National Institute of Polar Research), Hiroyuki Hashiguchi(Research Institute for Sustainable Humanosphere, Kyoto University), Akimasa Yoshikawa(Department of Earth and Planetary Sciences, Kyushu University), Chair:Hiroyuki Hashiguchi(Research Institute for Sustainable Humanosphere, Kyoto University)

12:00 PM - 12:15 PM

[PEM09-06] Coordinated Incoherent Scatter Radar and Fabry-Perot Interformeter observations of ionosphere-thermosphere
disturbances during the March 17-18, 2015 great solar storm

*Shunrong Zhang1, Phil Erickson1, Anthea Coster1, Mike Sulzer2, Michael Nicolls2, Mary McCready2, Yuichi Otsuka3, Jonathan Makela4, John Noto5 (1.Massachusetts Institute of Technology, 2.SRI International, 3.Nagoya University, 4.University of Illinois at Urbana-Champaign, 5.Scientific Solution, Inc.)

Keywords:geomagnetic storm, magnetosphere-ionosphere-thermosphere coupling, incoherent scatter radar, Fabry-Perot Interformeter

With a tremendous drop of the Dst index to ~ -230 nT, the geomagnetic storm during March 17-18, 2015 has been the largest during the current solar cycle. This strom was caused by a combined effect of the arriving solar Coronal Mass Ejection materials with high-speed solar wind streams originated from a nearby coronal hole. It was very fortunate for us to have coordinated an international campaign monitoring geospace disturbances during this period using ground-based facilities. These include incoherent scatter radars and Fabry-Perot Interferometers in the America sectors and other instruments in East Asia sectors, forming an observational network along approximately the 60W/120E meridional circle. The presentation will highlight these ground-based observations along with simultaneous DMSP in situ measurements and TEC from a network of dense GPS receivers, with a focuses on (1) the ion-neutral coupling processes at subauroral and mid-latitudes; (2) periodic midlatitude ionospheric disturbances; and (3) topside ionospheric variations. In particular, one of the most striking features to be discussed is the unexpected pre-midnight northward neutral wind surge, observed over multiple subauroral and midlatitude sites, accompanying strong westward winds developed at earlier times. We ascribe these wind disturbances to Subauroal Polarization Stream (SAPS).