JpGU-AGU Joint Meeting 2017

Presentation information

[EE] Poster

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

[P-EM17] [EE] Recent Advances in Ionosphere Observation and Modeling for Monitoring and Forecast

Mon. May 22, 2017 3:30 PM - 5:00 PM Poster Hall (International Exhibition Hall HALL7)

convener:Charles Lin(Department of Earth Science, National Cheng Kung University), Yang-Yi Sun(Kyushu Univsersuty, Department of Earth and Planetary Science), Hidekatsu Jin(National Institude of Information and Communications Technology), Jaeheung PARK(Korea Astronomy and Space Science Institute)

[PEM17-P03] Afternoon/sunset enhancement of the total electron content caused by solar eclipses

*Shih-Sian Yang1, Jann-Yenq Liu1, Yang-Yi Sun1,2 (1.Institute of Space Science, National Central University, Taiwan, 2.Department of Earth and Planetary Science, Kyushu University, Japan)

Keywords:solar eclipse, ionosphere, total electron content

Enhancement of the total electron content (TEC) during the afternoon/sunset period, which is considered being caused by the 24 Oct 1995 solar eclipse, has been observed and discussed by previous literature (Liu et al., Adv. Space Res., 1999; Tsai and Liu, J. Geophys. Res., 1999). During the 21 May 2012 annular solar eclipse, TEC profiles were employed to investigate the ionospheric solar eclipse effects, and the afternoon/sunset enhancement has again been observed a few hours later this eclipse event, occurring more than 16 years after the previous reported event. To find out the enhancement is an occasional or frequent phenomena, we investigated 12 total/annular solar eclipse during 2001 - 2016, in which the maximum obscuration belts passed over equatorial region, by using global ionosphere maps (GIM) data provided by Center for Orbit Determination in Europe (CODE). The enhancement has been observed in the majority of selected eclipses. A detail statistics of the occurrence in different condition and the possible mechanism of the afternoon/sunset enhancement is discussed and concluded in the present study.