日本地球惑星科学連合2016年大会

講演情報

インターナショナルセッション(ポスター発表)

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-EM03] Mesosphere-Thermosphere-Ionosphere Coupling in the Earth's Atmosphere

2016年5月22日(日) 17:15 〜 18:30 ポスター会場 (国際展示場 6ホール)

コンビーナ:*Liu Huixin(九州大学理学研究院地球惑星科学専攻 九州大学宙空環境研究センター)、齊藤 昭則(京都大学大学院理学研究科地球物理学教室)、Chang Loren(Institute of Space Science, National Central University)、新堀 淳樹(京都大学生存圏研究所)

17:15 〜 18:30

[PEM03-P05] Measurement of momentum flux Using two meteor radars in Indonesia

松本 直樹1新堀 淳樹1Dennis M2、*津田 敏隆1 (1.京都大学生存圏研究所、2.GATS, Inc.)

キーワード:Meteor radar, Momentum flux, Mesosphere and lower thermosphere, Hocking method, Equator, Semi-annual variation

Two nearly identical meteor radars were operated at Koto Tabang (0.20oS, 100.32oE), western Sumatra, and Biak (1.17oS, 136,10oE), western Papua in Indonesia, separated by approximately 4,000 km in longitude on the equator. The zonal and meridional momentum flux, uw’ and vw’ , where u, v and w are the eastward, northward and vertical wind velocity components, respectively, were estimated at 86 to 94 km altitudes using the meteor radar data by applying a method proposed by Hocking [2005]. The observed uw’ at the two sites agreed reasonably well at 86, 90 and 94 km during the observation periods when the data acquisition rate was sufficiently large enough. Variations of vw’ was consistent between 86, 90 and 94 km altitudes at both sites. The climatological variation of the monthly averaged uw’ and vw’ was investigated using the long-term radar data at Koto Tabang from November 2002 to November 2013. The seasonal variations of uw’ and vw’ showed a repeatable semiannual and annual cycles, respectively. uw’ showed eastward values in February-April and July-September, and vw’ was northward in June to August at 90-94 km, which were generally anti-phase with the mean zonal and meridional winds, having the same periodicity. Our results suggest the usefulness of the Hocking method.