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 3:30 PM - 5:00 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:Yasunobu Ogawa(National Institute of Polar Research)

4:25 PM - 4:40 PM

[PEM09-15] Variations of the polar lower thermosphere and mesosphere in February 2016 using EISCAT radar, meteor radar, MF radar, and sodium LIDAR observations

*Satonori Nozawa1, Yasunobu Ogawa2, Takuo T. Tsuda3, Hitoshi Fujiwara4, Masaki Tsutsumi2, Chris Hall5, Stephan Buchert6, Norihito Saito7, Satoshi Wada7, Takuya Kawahara8, Toru Takahashi3, Tetsuya Kawabata1, Tatsuya HIBINO1, Shintaro Takita1, Asgeir Brekke5 (1.Institute for Space-Earth Environment Research, Nagoya University, 2.NIPR, 3.The University of Electro-Communications, 4.Seikei University, 5.UiT The Arctic University of Norway, 6.Swedish Institute of Space Physics, 7.RIKEN, 8.Shinshu University)

Keywords:Lower thermosphere, Mesosphere, tidal waves, quasi-two data wave, EISCAT radar, sodium LIDAR

We made an EISCAT special program (SP) experiment, under collaborations of Japan, Sweden, and Norway, to study variations of a quasi-two day wave (Q2DW) and tidal waves in the polar lower thermosphere using the EISCAT UHF radar at Tromsoe (69.6N, 19.2E) and the EISCAT Svalbard radar at Longyearbyen (78.2N, 16.0E) for 45 hours. The SP started at 23 UT on February 10, 2016, just after EISCAT CP2 (Common program 2) run made for 135 hrs, and ended at 20 UT on February 12, 2016. By combining the EISCAT CP2 run and our SP run, we have, in total, made a data set of 7.5 day length. Unfortunately, there was a data gap from about 01 UT to 07 UT on February 7 due to a problem of data recording at the Tromsoe site. Except for the gap, the operations went well without no seirouous problems at both the EISCAT radars. Sodium LIDAR observations of wind, temperature, and sodium density collocated at the Tromsoe site were also made during dark time intervals together with meteor and MF radar contiunual observations. We have analyzed the data sets, and derived Q2DW and 24h/12h tides. An SSW occurred in this time interval, so we focus on changes of the waves around time interval of the SSW.