Multifrequency Observations of Sudden Cosmic Noise Absorption and X‐Ray Flares

TL;DRAbstract

This work reports the results of (a) a study of SCNA observations made with a multifrequency riometer system operating at Delhi, and (b) a comparative study of SCNA's and satellite measurements of X‐ray flux. Multifrequency riometer observations of SCNA's recorded at Delhi show that while for many SCNA's the peak absorption remains at the preflare level, for some it comes down appreciably to heights between 6G‐70 km. Examination of the nature of decay of the SCNA's shows that the quantity cx(N + N.,) has values of (2G‐60) X ro‐sec' near the peak of the flare, decreasing asymptotically to a constant value of 3 X IO‐sec‐ 1 at the end of the flare. Comparison of the times of maximum of SCNA's with those of X‐ray flux obtained from observations made with the Vela, SR‐1, and Aeriel‐1 satellites gave an average relaxation time of 3‐4 min, which is of the same order as that obtained with H a time curves. For one of the SCNA events, that of October 20, 1963, for which information is available

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