Japan Geoscience Union Meeting 2015

Presentation information

International Session (Oral)

Symbol P (Space and Planetary Sciences) » P-EM Solar-Terrestrial Sciences, Space Electromagnetism & Space Environment

[P-EM06] Mesosphere-Thermosphere-Ionosphere Coupling in the Earth's Atmosphere

Wed. May 27, 2015 11:00 AM - 12:45 PM A01 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), Yuichi Otsuka(Solar-Terrestrial Environment Laboratory, Nagoya University), Libo Liu(Institute of Geology and Geophysics, Chinese Academy of Sciences), Atsuki Shinbori(Research Institute for Sustainable Humanosphere (RISH), Kyoto University), Chair:Atsuki Shinbori(Research Institute for Sustainable Humanosphere (RISH), Kyoto University)

12:30 PM - 12:45 PM

[PEM06-17] Excitation of large-scale gravity waves in the upper thermosphere by interplanetary fluctuations

*Jianpeng GUO1, Huixin LIU2 (1.National Space Science Center, Chinese Academy of Sciences, 2.Earth and Planetary Science Division, Kyushu University)

Keywords:interplanetary fluctuations, gravity wave, traveling atmospheric disturbances, thermosphere

Fluctuations on timescales of minutes to hours are common in the solar wind. When the fluctuations encounter the Earth, they could induce impulsive auroral intensification, which, in turn, excite gravity waves in the auroral regions. These gravity waves, particularly large-scale (> ~1000 km) gravity waves, will give rise to traveling atmospheric disturbances with typical amplitudes of 20~40% in the upper thermosphere. We report here the detection of full constructive interference between two large-scale gravity waves excited in northern and southern auroral regions by an interplanetary shock, and the detection of extremely efficient multiple excitation of large-scale gravity waves by a long-duration Alfven wave train carried by a high-speed stream.