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

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23..899b&link_type=abstract

Planetary and Space Science, vol. 23, May 1975, p. 899-903.

Physics

1

Geomagnetism, Solar Activity Effects, Spread F, Sunspots, Diurnal Variations, Kp Index, Midlatitude Atmosphere, Traveling Ionospheric Disturbances, Tropical Regions, Twenty-Seven Day Variation

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 relative to days of high geomagnetic activity. A good correlation is found between days of high A-p index and high spread-F occurrence for a pre-sunrise interval of a few hours. When 3-hourly K-p 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 traveling disturbances, initiated in polar regions at times of high geomagnetic activity.

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