1978•Indian Institute of AstrophysicsRequires access

Equatorial spread-F configurations and geomagnetic activity.

J. Hanumath SASTRI, K. K. Sasidharan, Vishnu B. Subrahmanyam, M. Srinivasa Rao

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Abstract

Using quarter-hourly ionogram data at Kodaikanal (geomag. lat: 0.6°N; dip: \n3•S0N) for the period 19.57-63 a study is made of the effect of \ngeomagnetic activity on the occurrence of range and frequency types of \nspread-F. It is found that the occurrence of both range and frequency \ntypes of spread-F shows a significant negative correlation with \ngeomagnetic activity but only during years of high sunspot activity.

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What this paper is about

Using quarter-hourly ionogram data at Kodaikanal (geomag. lat: 0.6°N; dip: \n3•S0N) for the period 19.57-63 a study is made of the effect of \ngeomagnetic activity on the occurrence of range and frequency types of \nspread-F. It is found that the occurrence of both range and frequency \ntypes of spread-F shows a significant negative correlation with \ngeomagnetic activity but only during years of high sunspot activity.

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Available abstract

Using quarter-hourly ionogram data at Kodaikanal (geomag. lat: 0.6°N; dip: \n3•S0N) for the period 19.57-63 a study is made of the effect of \ngeomagnetic activity on the occurrence of range and frequency types of \nspread-F. It is found that the occurrence of both range and frequency \ntypes of spread-F shows a significant negative correlation with \ngeomagnetic activity but only during years of high sunspot activity.

Key concepts: Earth's magnetic field, Geology, Geodesy, Geophysics, Physics, Magnetic field, Quantum mechanics

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