TERRAPUB Earth, Planets and Space

Earth Planets Space, Vol. 64 (No. 6), pp. 513-520, 2012

Using the IRI, the MAGIC model, and the co-located ground-based GPS receivers to study ionospheric solar eclipse and storm signatures on July 22, 2009

Chi-Yen Lin1,2, Jann-Yenq Liu1,3,4, Chien-Hung Lin5, Yang-Yi Sun1,2, Eduardo A. Araujo-Pradere2, and Yoshihiro Kakinami1

1Institute of Space Science, National Central University, No. 300, Jhongda Rd., Jhongli City, Taoyuan County 32001, Taiwan
2Cooperative Institute for Research in Environmental Sciences, University of Colorado, and Space Environment Center, NOAA, Boulder, Colorado 80305, U.S.A.
3Center for Space and Remote Sensing Research, National Central University, No. 300, Jhongda Rd., Jhongli City, Taoyuan County 32001, Taiwan
4National Space Program Origination, 8 F, No. 9, Prosperity 1st Rd., Hsinchu Science Park, HsinChu, Taiwan
5Department of Earth Science, National Cheng Kung University, No. 1, University Road, Tainan City 701, Taiwan

(Received June 17, 2010; Revised August 2, 2011; Accepted August 11, 2011; Online published July 27, 2012)

Abstract: The longest total solar eclipse in the 21st century occurred in Southeast Asia on 22 July 2009 from 00:55 to 04:15 UT, and was accompanied by a moderate magnetic storm starting at 03:00 UT with a Dst reduction of -78 nT at 07:00 UT. In this study, we use the ionospheric reference model IRI, the data assimilation model MAGIC, and ground-based GPS receivers to simulate and examine the ionospheric solar eclipse and geomagnetic storm signatures in Taiwan and Japan. Cross-comparisons between the two model results and observations show that IRI fails to simulate the two signatures while MAGIC partially reproduces the storm features. It is essential to include ground-based GPS measurements to improve the IRI performance.
Key words: Solar eclipse, geomagnetic storm, IRI, GPS TEC, MAGIC.

Corresponding author E-mail: jyliu@jupiter.ss.ncu.edu.tw

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