Japan Geoscience Union Meeting 2018

Presentation information

[EE] Oral

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

[P-EM10] Coupling Processes in the Atmosphere-Ionosphere System

Tue. May 22, 2018 10:45 AM - 12:15 PM 304 (3F International Conference Hall, Makuhari Messe)

convener:Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), Loren Chang(Institute of Space Science, National Central University), Yuichi Otsuka(名古屋大学宇宙地球環境研究所), Chairperson:Otsuka Yuichi

11:05 AM - 11:25 AM

[PEM10-17] Neutral wind effects on equatorial plasma bubbles simualted by High-Resolution Bubble model

*Tatsuhiro Yokoyama1, Hidekatsu Jin1, Hiroyuki Shinagawa1, Huixin Liu2 (1.National Institute of Information and Communications Technology, 2.Kyushu University)

Keywords:equatorial ionosphere, plasma bubble, simulation

Equatorial plasma bubble (EPB) is a well-known phenomenon in the equatorial ionospheric F region. As it causes severe scintillation in the amplitude and phase of radio signals, it is important to understand and forecast the occurrence of EPB from a space weather point of view. EPBs are generated in the bottomside of the F region, where the ionospheric plasma is strongly coupled with the thermospheric neutral wind. The ambient neutral wind controls F-region dynamo and prereversal enhancement of the vertical plasma drift in the dusk sector. A seeding of EPBs may be related with atmospheric gravity waves propagated from the lower atmosphere. The day-to-day variability of EPB occurrence, which is one of the most important topics in this field, may be explained by the variation of neutral wind. In order to simulate the instability in the equatorial ionosphere, a 3D high-resolution bubble (HIRB) model with a grid spacing of less than 1 km has been developed. Changing the neutral wind velocity in the model based on global atmospheric modeling and satellite observations, the neutral wind effects on the generation of EPBs can be evaluated. Simulation results of EPB generation under various neutral wind conditions and seeding factors will be discussed.