[M-IS09] Interdisciplinary studies on pre-earthquake processes

[MIS09-16] FORMOSAT-5/AIP observe seismo-ionospheric precursors and ionospheric storms

*JANN-YENQ Liu^1,2,3、FU-YUAN CHANG^1,2、YUN-CHENG WEN²、Yuh-ING Chen⁴、Chi-Kuang Chao^1,2、Loren Chang^1,2 (1.Center for Astronautical Physics and Engineering, National Central University, TAIWAN、2.Graduate Institute of Space Science and Engineering, National Central University, TAIWAN、3.Center for Space and Remote Sensing Research, National Central University, TAIWAN、4.Graduate Institute of Statistics, National Central University, TAIWAN)

キーワード：FORMOSAT-5, advanced ionospheric probe, total electron content, seismo-ionospheric precutsor, ion velocity, plasma

The mission of Advanced Ionospheric Probe (AIP) onboard FORMOSAT-5 (F5) is to detect seismo-ionospheric precursors (SIPs) and observe ionospheric weathers. F5/AIP plasma quantities in nighttime of 22:30 LT (local time) and the total electron content (TEC) of the global ionosphere map (GIM) are used to study SIPs of an M7.3 earthquake in the Iran-Iraq Border area on 12 November as well as two positive storms on 7 and 21-22 November 2017. The TEC and the F5/AIP ion density/temperature significantly increase over the epicenter area on 3-4 November (day 9-8 before the earthquake) and on the two storm days. The significant TEC increases appearing day 9-8 before the earthquake agrees with the temporal SIP characteristic that the TEC significant increases appear day 14-6 before 53 greater than M 5.5 earthquakes in the Iran-Iraq area. This agreement indicates that the temporal SIP of the earthquake has been detected. The significant TEC increases frequently appearing specifically over the epicenter area day 9-8 before the earthquake confirms the SIP being observed, while those frequently occurring at worldwide high-latitudes are signatures of the two positive storms. Significant TEC increase anomalies most frequently appearing in the Iran-Iraq area on 21-22 November (day 10-9 before) is coincidently followed by an M6.1 earthquake on 1 December 2017, which again meets the temporal SIP characteristic. The F5/AIP ion velocity uncovers that the SIPs of the two earthquakes are caused by eastward seismo-generated electric fields, and the two positive storms are due to the prompt penetration electric fields.