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 11:00 AM - 11:45 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)

11:15 AM - 11:30 AM

[PEM11-15] Characteristics of 100-1000 km-scale ionospheric disturbances observed by ISS-IMAP in collaboration with TEC map

*Michi NISHIOKA1, Takuya TSUGAWA1, Tatsuhiro YOKOYAMA1, Minoru KUBOTA1, Akinori SAITO2, Takeshi SAKANOI3, Yusuke AKIYA2, Yuichi OTSUKA4, Mamoru ISHII1 (1.National Institute of Information and Communications Technology, 2.Department of Geophysics, Kyoto University, 3.Department of Geophysics, Tohoku University, 4.Solar-Terrestrial Environment Laboratory, Nagoya University)

Keywords:ionospheric disturbance, ISS-IMAP, VISI 630nm airglow, GPS-TEC map

Two-dimensional Total Electron Content (TEC) map has been used for revealing characteristics of meso-scale ionospheric disturbances, such as Medium-Scale Travelling Ionospheric Disturbances (MSTIDs) and Equatorial Plasma Bubble (EPBs). We have developed high-resolution TEC maps as "Dense Regional And Worldwide International Networks of GNSS-TEC observation (DRAWING-TEC)" project (http://seg-web.nict.go.jp/GPS /DRAWING-TEC/). The project provides regional and global maps of absolute value of TEC, de-trended TEC with 60-min window, and Rate of TEC change Index (ROTI). As of 2015, regional maps are produced over North America and Europe in addition to Japan. These regional maps are powerful tools for studying characteristics of MSTIDs and EPBs. However, it is impossible to detect MSTIDs and EPBs over oceans by only TEC data derived from ground-based GPS receivers. In contrast with GPS-TEC data, airglow images observed by ISS-IMAP/VISI cover all areas including continents and oceans. But detecting MSTIDs from the space-borne imager is difficult since the 630 nm-airglow is weak in the mid-latitude ionosphere. In this study, we analysis both GPS-TEC data and ISS-IMAP/VISI 630 nm imager data and succeeded in detecting MSTIDs using ISS-IMAP/VISI 630 nm imager data. The spatial structure and occurrence characteristics of MSTIDs detected from ISS-IMA/VISI 630nm imager will be discussed in this presentation.