Ionospheric Response to the 21 May 2012 Annular Solar Eclipse Over Taiwan

J. Y. Liu, S. S. Yang, P. K. Rajesh, Y. Y. Sun, J. Chum, C. J. Pan, Y. H. Chu, C. K. Chao, L. C. Chang

研究成果: 雜誌貢獻期刊論文同行評審

11 引文 斯高帕斯(Scopus)


An annular solar eclipse swept over Taiwan in the early morning on 21 May 2012. This provides an excellent opportunity to study ionospheric response to the solar eclipse mainly due to photochemical effects. Local ground-based Global Positioning System receivers, an ionosonde, high frequency-continue wave Doppler sounding systems, and very low frequency receivers are used to observe ionospheric eclipse signatures. These multiinstrument observations show that the extreme total electron content (TEC) depression lags the maximum obscuration by about 5–20 min, while the Doppler frequency shift decreases and increases (i.e., the ionosphere ascends and descends) during first contact-maximum obscuration and maximum obscuration-last contact, respectively. The ionosonde data well agree with the TEC and Doppler frequency shift observations. The results show that the extreme TEC depression lag (i.e., delay time) being inversely proportional to the associated maximum obscuration confirms that the photochemical process is essential in Taiwan during the 21 May 2012 annular solar eclipse. A theoretical derivation is proposed for the first time to explain the delay time due to pure photochemical process during solar eclipses.

頁(從 - 到)3623-3636
期刊Journal of Geophysical Research: Space Physics
出版狀態已出版 - 5月 2019


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