Ionospheric spread-F at Huancayo,sunspot activity and geomagnetic activity |
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| Authors: | GG Bowman |
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| Institution: | Department of Physics, University of Queensland, Brisbane, Q. 4067, Australia |
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| Abstract: | 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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