Daytime e-region irregularities during the 22 July 2009 solar eclipse over Chung-Li (24.9�N, 121.2�E), a moderate mid-latitude station

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Title:	Daytime e-region irregularities during the 22 July 2009 solar eclipse over Chung-Li (24.9�N, 121.2�E), a moderate mid-latitude station
Authors:	蘇清論;Brahmanandam, Potula Sree;Chu, Yen Hsyang;Su, Ching-Lun;Lin, Ting-Han
Contributors:	地球科學學院太空科學與工程學系
Keywords:	Backscatter;Backscattering;Coherent radar;Coherent scattering;Daytime;Doppler sonar;E region;E-region irregularities;Echoes;Electric field;Electric fields;Gravitational waves;Gravity waves;Induced polarization;Instability;Interferometers;Ion recombination;Ionosondes;Ionospheric conditions;Ionospheric irregularities;Irregularities;Latitude;Mid-latitude ionosphere;Molecular ions;Moon;Radar;Radar backscatter;Recombination;Scatter propagation;Solar eclipse;Solar eclipses;Solar radiation;Sporadic E layer;Stability;Velocity;Wave propagation
Date:	2013-12-01
Issue Date:	2026-04-23 11:03:31 (UTC+8)
Publisher:	Chinese Geoscience Union;Taiwan: 中華民國地球科學學會
Abstract:	摘要： The 22 July 2009 solar eclipse with an obscuration of > 83% at Chung-Li (24.9°N, 121.2°E, Dip 35°N) in Taiwan during noon hours has provided a unique opportunity for us to examine its impact on E-region irregularities which were observed simultaneously by the 52 MHz coherent radar and a co-located ionosonde. Significant observations revealed that the daytime E-region strong backscatter echoes at multiple heights and a sudden intensification of the weak sporadic E-layer during the 22 July 2009 solar eclipse. These results follow the research findings of Patra et al. (2009). As the incident solar radiation suddenly blocked by intruding Moon during solar eclipse events that would generally create night-like ionospheric conditions, it is surmised that the E-region irregularities were indeed induced by the eclipse associated effects. The induced effects resulted in faster recombination of molecular ions, generation of gravity waves and electric fields that could have created a conducive environment to excite plasma irregularities through a gradient-drift instability mechanism. The vertical shears of radar Doppler velocity and the peak radar backscatter at the node of Doppler velocity shear, as resolved by the coherent scatter radar with interferometer technique, were possibly due to the upward propagating gravity waves and wave-induced polarization electric fields. The present observational results should not only be highly useful to ascertain plausible mechanisms responsible for nighttime E-region irregularities, but also provided evidence that a solar eclipse could generate E-region plasma irregularities over temperate mid-latitudes for the first time. 出版者： Taiwan: 中華民國地球科學學會出版日期： 2013-12-01 出處： TAO : Terrestrial, atmospheric, and oceanic sciences, 2013-12, Vol.24 (6), p.1021-1032 資源來源：華藝電子期刊(CEPS) 版權： 2013. This work is licensed under https://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. 識別號： ISSN: 1017-0839 識別號： ISSN: 2223-8964 識別號： ISSN: 2311-7680 識別號： EISSN: 2311-7680 識別號： DOI: 10.3319/TAO.2013.07.08.01(AA)
Appears in Collections:	[DEPARTMENT OF SPACE SCIENCE AND ENGINEERING] journal & Dissertation

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