Abstract
The results of vertical ionospheric soundings at Ahmedabad during the partial (magnitude 47%) solar eclipse on 14th December 1955 are discussed. The critical frequency of the E layer on control days varied according to the lawf oE=kcos n X, k andn having the mean values 4·06 Mc./s. and 0·37 respectively. The variation off oE during eclipse period was roughly consistent with that of Chapman Layer with a recombination coefficient of about 0·8 × 10−8 cm.3 sec.−1 The critical frequencies of E1, E2 and F1 layers decreased during eclipse, though the variations were irregular. The percentage deviation off 0F2 on the eclipse day from the control day values showed a minimum at about the middle of the eclipse period. There were indications of the formation off 1·5 during the latter part of the eclipse. Semi-thickness of the F2 layer had increased during the eclipse period. Sporadic E layer was not affected by the eclipse.
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