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|Title:||A Comparative Study on the 27-day Cycle Variation in Solar Activities Calcium Plage: Sunspots & Radio Emission|
|Authors:||Gupta, M K Das|
Sarkar, S K
|Abstract:||The 27-day cyclic variations in sunspot activity and also in solar radio emission in the decimetric and centimetric wavelengths (S-component) have been analyzed in relation to the 27-day cycle variation in Ca-plage activity. Some of the important results obtained from a comparative study of these three phenomena over a period of nearly six years are as follows. (i) The peaks of the average 27-day cycle in all the three cases have been found to coincide more or less on the same day but their respective nature of variations are different. (ii) The slowly varying component of radio emission at 410, 606, 1415, 2695, 4995, 8800 and 15400 MHz appears to have its peak intensity somewhere in the range 2695 and 4995 MHz. The day-to-day variations of the slowly varying components at different frequencies are highly similar in nature. The correlation coefficient amongst them has been found to be very high; it even approaches 0'99. (iii) In the rising phase of the 27-day cycle, the rate of rise of the Ca-plage index, the sunspot number and the slowly varying component of solar radio emission are quite different but no such comment can be made in the falling phase of the 27-day cycle.|
|ISSN:||0975-105X (Online); 0367-8393 (Print)|
|Appears in Collections:||IJRSP Vol.08(5&6) [October & December 1979]|
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