Study of solar flares using cosmic radio noise on 25 Mc./s. at Ahmedabad (23°02′ N., 72°38′ E.)

The paper describes observations made at Ahmedabad of sudden cosmic noise absorptions (SCNA’s) on 25 Mc./s. associated with solar flares. The frequency distributions of solar flare attenuations, their times of growth and duration, etc., have been determined and the results are compared with similar observations made by other workers. It has been found that SCNA’s of 25 Mc./s. recorded at Ahmedabad in 1956–58 have been markedly larger in size and duration than those observed in Australia on 18·3 Mc./s. in 1950–51.