The response of sporadic E-layer to the total solar eclipse of July 22, 2009 over the equatorial ionization anomaly region of the Indian zone

• Published in: Advances in space research 2013-06, Vol.51 (11), p.2043-2047
• Main Authors: Yadav, Sneha, Das, Rupesh M., Dabas, R.S., Gwal, A.K.
• Format: Article
• Language: English
• Subjects: Gravity waves; Low-latitude ionosphere; Solar eclipse; Sporadic-E layer
• ISSN: 0273-1177; 1879-1948
• DOI: 10.1016/j.asr.2013.01.011

► We have examined the effect of solar eclipse on the Es layer over low-latitude station. ► Solar eclipse causes the intensification of the Es-layer. ► Signatures of solar eclipse induced gravity waves are observed in foEs values. The digital ionosonde located in Bhopal (23.2°N,77.2°E), India has been used to investigate the responses of the Es layer in the equatorial ionization anomaly (EIA) crest to the total solar eclipse (TSE) of July 22, 2009. Results show the presence of intense Es layer during and after the eclipse period. The gravity waves induced by the solar eclipse propagated upward in the Es layer and produced the periodic disturbance. The results of the wavelet analysis display the presence of dominant oscillation of about 24–32, 16–20 and 8min. The appearance of intense sporadic-E concomitantly with the signatures of gravity wave suggests that the wind shear introduced by the solar eclipse induced gravity wave might be the plausible mechanism behind the intensification of Es-layer ionization.