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Title: Seasonal & Sunspot-cycle Effects in the Occurrence of Equatorial Spread-F Configurations
Authors: Sastri, J Hanumath
Sastdharan, K
Subrahmanya, V
Rao, M M Srirama
Issue Date: Jun-1979
Publisher: NISCAIR-CSIR, India
Abstract: A study has been made of the seasonal and solar cycle changes in the occurrence of the range- and frequency-type of spread-F at Kodaikanal (geomag, lat" 0'6o N; dip, 3'5 o N) using ionogram data for the period 1957-69. It is found that the range type of spread-F IS the predominant configuration on ionograms at Kodaikanal at any time o year. The occurrence of the frequency type of spread-F-shows a significant positive correlation with sunspot number irrespective of season while that of range-type spread-F shows such behaviour only during local summer months, A comparison of the behaviour of spread-F configurations at Kodaikanal with those at Huancayo reported recently indicates striking longitudinal dependence of the seasonal and solar cycle effects in the occurrence of the two basic forms of spread-F on equatorial ionograms.
Page(s): 135-138
ISSN: 0975-105X (Online); 0367-8393 (Print)
Appears in Collections:IJRSP Vol.08(3) [June 1979]

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