Ionospheric spread-F at Huancayo, sunspot activity and geomagnetic activity

Details Ionospheric spread-F at Huancayo, sunspot activity and geomagnetic activity Ionospheric spread-F at Huancayo, sunspot activity and geomagnetic activity

Nov 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974p%26ss...22.1579b&link_type=abstract

Planetary and Space Science, Volume 22, Issue 11, p. 1579-1583.

Physics

3

Scientific paper

A superposed-epoch method is used to investigate the occurrence of spread-F at Huancayo relative to days of high sunspot activity and also relative to days of high geomagnetic activity. A good correlation is found between days of high Ap index and high spread-F occurrence for a pre-sunrise interval of a few hours. When 3-hourly kp indices are used they show a peak value approximately 6 hr prior to an above-average occurrence of spread-F. It is suggested that this pre-sunrise spread-F is associated with ionospheric height rises which are produced by travelling disturbances, initiated in polar regions at times of high geomagnetic activity.

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