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|Title:||Effect of Sudden Ionospheric Disturbances on the Field Strength of an If Radio Signal in Relation to Solar X-ray Flux in Different Wavelength Ranges|
|Authors:||Sen, A. K.|
|Abstract:||The SID effects observed on the field strength of an If radio signal at 280 kHz transmitted from Jessore (lat., 23° 10'N; long., 89o 10'E) in Bangladesh at a distance of about 110 km from Calcutta (lat., 22° 34/N; long., 88° 24'E) often appears as an SES or an SAS and the effect sometimes appears to be superimposed on a long duration absorption of signal. From a correlation of the SID data obtained during the period June 1972 May 1973, with the solar X-ray flux in the different wavelength ranges, it appears that the relative strength of the 0.5-3 Ǻ flux with respect to the 1-8 Ǻ flux would be important in determining the form of the effect. An SID effect appear' to occur as an SES when the ratio of 0.5-3 Ǻ flux to 1-8 Ǻ flux is greater than about 0.025, while it tends to appear as an SAS when the ratio is less than about 0.025. The long duration absorption of signal appears to be associated with the longer-life soft X-ray flux in the wavelength range of 8-20 Ǻ.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.04(1) [March 1975]|
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