Japan Geoscience Union Meeting 2023

Presentation information

[E] Online Poster

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

[P-EM12] Coupling Processes in the Atmosphere-Ionosphere System

Mon. May 22, 2023 10:45 AM - 12:15 PM Online Poster Zoom Room (2) (Online Poster)

convener:Huixin Liu(Earth and Planetary Science Division, Kyushu University SERC, Kyushu University), Yuichi Otsuka(Institute for Space-Earth Environmental Research, Nagoya University), Loren Chang(Department of Space Science and Engineering, National Central University), Yue Deng(University of Texas at Arlington)


On-site poster schedule(2023/5/21 17:15-18:45)

10:45 AM - 12:15 PM

[PEM12-P12] The lunar phase effects on the equatorial ionization anomaly crest and ionospheric electron density structure

*Tsung-Yu Wu1, Jann-Yenq LIU1,2,3, CHIYEN LIN1,2, Loren Chang1,2 (1.Center for Astronautical Physics and Engineering, National Central University, Taoyuan, Taiwan, 2.Department of Space Science and Engineering, National Central University, Taoyuan, Taiwan, 3.Center for Space and Remote Sensing Research, National Central University, Taoyuan, Taiwan)

The total electron content (TEC) of global ionosphere maps, and the electron density profiles observed by global navigation satellite system (GNSS) radio occultation (RO) measurements from the FORMOSAT-3/COSMIC (F3/C) and FORMOSAT-7/COSMIC-2 (F7/C2) are utilized to find the ionosphere response to lunar gravitational force. The results show that the appearance time and latitudinal location of the equatorial ionization anomaly (EIA) crest yield prominent lunar phase signature with 14.76-day period. The EIA crests on the new moon or full moon lead those of the overall average by about 20–40 minutes. By contrast, the EIA crests on the first quarter or third quarter lag those of the overall average by about 20–40 minutes. Meanwhile, EIA crests move the furthest poleward and equatorward with 1° latitude 2–5 days after the new moon or full moon and the first quarter or third quarter, respectively. The electron density further depicts global three-dimensional plasma flows in the ionosphere due to the lunar gravitational force.