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

Sun. May 22, 2016 9:00 AM - 10:30 AM A01 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), Akinori Saito(Department of Geophysics, Graduate School of Science, Kyoto University), Loren Chang(Institute of Space Science, National Central University), Atsuki Shinbori(Research Institute for Sustainable Humanosphere (RISH), Kyoto University), Chair:Atsuki Shinbori(Research Institute for Sustainable Humanosphere (RISH), Kyoto University)

10:15 AM - 10:30 AM

[PEM03-05] 3-years Occurrence Variability of Concentric Gravity Waves in the Mesopause Observed by IMAP/VISI

*Septi Perwitasari1, Takeshi Sakanoi1, Takuji Nakamura2, Mitsumu K. Ejiri2, Masaki Tsutsumi2, Yoshihiro Tomikawa2, Yuichi Otsuka3, Atsushi Yamazaki4, Akinori Saito5 (1.Planetary Plasma and Atmospheric Research Center, Graduate School of Science, Tohoku University, 2.National Institute of Polar Research, 3.Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Japan, 4.JAXA/ISAS, 5.Geophysics Department, Kyoto University, Kyoto, Japan)

Keywords:Concentric gravity wave, O2 nightglow emission, Mesopause

We report the first statistical study on concentric gravity waves (CGWs) in the mesopause by using 3 years data obtained by IMAP/VISI. 235 CGWs events were found with horizontal wavelength ranging from 40 to 250 km and maximum radius of 200 to 3000 km. Occurrence of the CGWs was significantly higher during non-solstice months (February-May and August–November) than solstice months (June-July and December-January), suggesting low to moderate wind are preferable for CGWs upward propagation. The latitudinal distribution of the CGWs centers had peaks in mid latitude (40°N and 40°S) and minimum at low latitude (10°S). More events were found in the summer hemisphere mid-latitudes, with a clear transition between north and south hemisphere around equinoxes. The information of the preferable regions seen in the global distribution map and the seasonal distribution could be useful for region and seasonal selection of CGWs’ future studies.