Occurrence of sporadic E ionization during the partial solar eclipse of 1955 over Haringhata is studied in the light of the present theory relating to internal gravity waves. It is found that the variation of fEs indicates a periodicity that is inexplicable by the normal eclipse effect observed for regular ionospheric layers. From a critical study of the variation, tentative conclusion is drawn indicating that the enhancement of Es ionization during the solar eclipse over this station may be related to internal gravity waves generated in the atmosphere from the fast-moving cooling spot of the shadow region.
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Ratna Datta (1973) studied this question.
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