Japan Geoscience Union Meeting 2016

Presentation information

International Session (Poster)

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 5:15 PM - 6:30 PM Poster Hall (International Exhibition Hall HALL6)

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)

5:15 PM - 6:30 PM

[PEM03-P14] Plasma Depletion Bays in the Equatorial Ionosphere Observed by TIMED and FORMOSAT3/COSMIC during 2007-2015

*FUYUAN CHANG1, Jann-Yenq Liu1 (1.Graduate Institute of Space Science, National Central University, Taiwan)


An interesting new feature of three Northern (one Southern) ionospheric plasma
depletion bays over the magnetic equator is for the first time found in airglow
emissions of 135.6 nm by TIMED/GUVI in May (January) of 2007. Electron density
profiles derived from FORMOSAT3/COSMIC are further used to study diurnal,
altitude, seasonal, longitudinal, and solar activity variations of the plasma depletion
bays. Results show that the plasma depletion bays become the most prominent at
250-300 km altitude around the midnight during the low solar activity year. The three
(one) bays appear between 60W-180E (80W-150W) during April-September,
especially May (October-March). Model simulations suggest that the trans-equatorial
neutral wind in the thermosphere should play an important role.