日本地球惑星科学連合2016年大会

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インターナショナルセッション(口頭発表)

セッション記号 P (宇宙惑星科学) » P-EM 太陽地球系科学・宇宙電磁気学・宇宙環境

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

2016年5月23日(月) 15:30 〜 17:00 106 (1F)

コンビーナ:*山本 衛(京都大学生存圏研究所)、野澤 悟徳(名古屋大学宇宙地球環境研究所)、小川 泰信(国立極地研究所)、橋口 浩之(京都大学生存圏研究所)、吉川 顕正(九州大学大学院理学研究院地球惑星科学部門)、座長:小川 泰信(国立極地研究所)

16:25 〜 16:40

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

*野澤 悟徳1小川 泰信2津田 卓雄3藤原 均4堤 雅基2ホール クリス5ブハート ステファン6斎藤 徳人7和田 智之7川原 琢也8高橋 透3川端 哲也1日比野 辰哉1滝田 真太郎1ブレッケ アスゲイル5 (1.名古屋大学宇宙地球環境研究所、2.国立極地研究所、3.電気通信大学、4.成蹊大学、5.トロムソ大学、6.スウェーデン宇宙物理研究所ウプサラ支部、7.理化学研究所、8.信州大学)

キーワード: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.