Japan Geoscience Union Meeting 2015

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International Session (Oral)

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

[P-EM11] New frontier: Observations of the middle and upper atmospheres from ISS

Mon. May 25, 2015 9:00 AM - 10:45 AM A01 (APA HOTEL&RESORT TOKYO BAY MAKUHARI)

Convener:*Akinori Saito(Department of Geophysics, Graduate School of Science, Kyoto University), Mitsuteru Sato(Department of Cosmoscience, Hokkaido University), Yuichi Otsuka(Solar-Terrestrial Environment Laboratory, Nagoya University), Tomoo Ushio(Information and communication engineering department, Osaka University), Makoto Suzuki(Institute for Space and Astronautical Sciences, Japan Aerospace Exploration Agency), Chair:Akinori Saito(Department of Geophysics, Graduate School of Science, Kyoto University), Yuichi Otsuka(Solar-Terrestrial Environment Laboratory, Nagoya University)

9:30 AM - 9:45 AM

[PEM11-09] O2 airglow concentric structure observed from International Space Station

Yusuke AKIYA1, *Akinori SAITO1, Takeshi SAKANOI2, Yuta HOZUMI1, Atsushi YAMAZAKI3, Yuichi OTSUKA4, Michi NISHIOKA5, Takuya TSUGAWA5 (1.Grad. Sch. of Science, Kyoto Univ., 2.PPARC, Tohoku Univ., 3.ISAS/JAXA, 4.STEL, Nagoya Univ., 5.NICT)

Visible and near-infrared spectral imager (VISI) for ISS-IMAP (the International Space Station - Ionosphere, Mesosphere, upper Atmosphere and Plasmasphere mapping) mission observes nighttime airglow emission from ISS. VISI observes the airglow in the nadir direction by two field-of-views (FOVs) which directs the forward and the backward to the ISS orbit. Some concentric structures which are difficult to observe the entire image by the ground-based imagers were detected from the space by VISI. Concentric structure in the 762-nm O2 airglow emission observed on June 1, 2013 was analyzed in this study. Spatial scale of this concentric structure was determined to be 1,200 km from the center of the structure to its edge. Propagation velocity of the waves which spread radially from the center was derived as 125 ± 62 m/s from the difference between the images taken by two FOVs of VISI. Duration time of the concentric structure was estimated to be 2 - 5 hours from the spatial scale and the propagation velocity of the waves. Concentric structure in GPS-TEC which was caused from the tornado was observed before the VISI observation had faster propagation velocity and longer wavelength than those in the airglow concentric structure. It was speculated that the O2 airglow observed by VISI was caused by secondarily waves which propagate in the horizontal direction that were caused from the atmospheric gravity waves generated disturbance in the troposphere.