Seasonal variation of the equatorial wind jet at 250 km and 400 km: GOCE and CHAMP observations

Huixin Liu; J. Nakashima; Eelco Doornbos

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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)

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17:15 〜 18:30

[PEM03-P15] Seasonal variation of the equatorial wind jet at 250 km and 400 km: GOCE and CHAMP observations

*Huixin Liu¹、J. Nakashima¹、Eelco Doornbos² (1.Earth and Planetary Science Division, Kyushu University、2.Technical University of Delft, the Netherland)

キーワード：wind jet, thermosphere wind, ion-neutral coupling

By using long-term in-situ wind observations from the GOCE satellite at 250 km, and the CHAMP satellite at ~400 km, this study examine the seasonal variation of the equatorial wind jet previously reported using short-term CHAMP and DE-2 satellite observations. The results show that the wind jet exists at both altitudes, and experiences similar seasonal variations. The wind jet is found to be strongest around the September equinox, and disappears around the June solstice at both altitudes. The jet shows little solar cycle and geomagnetic activity dependence. These seasonal variations are interpreted in the framework of ion-neutral interaction.