Relation between magnetic activity and spread-F at Kodaikanal

Jagath Kumar, V. R. ; Sanyasi Raju, P. T. ; Ramachandra Rao, B. (1967) Relation between magnetic activity and spread-F at Kodaikanal Journal of Atmospheric and Terrestrial Physics, 29 (12). pp. 1669-1672. ISSN 0021-9169

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The correlation between night time values of spread-F indices, magnetic K-indices and h'maxF values for Kodaikanal are examined for a half solar cycle. Cross correlograms for spread-F indices and magnetic K-indices show that the variations of occurrence of spread-F echoes lag behind the variations of K-index by a period varying from zero in the sunspot maximum period to 5 days in the sunspot minimum period. A similar effect is observed between h'maxF variations and K-index variations but with lesser delay. A strong positive correlation is observed between spread-F indices and h'maxF values without any time lag throughout the half solar cycle.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
ID Code:33024
Deposited On:21 Mar 2011 13:44
Last Modified:10 Jun 2011 04:30

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