Some effects of geomagnetic activity and ionospheric height rises on mid-latitude spread-F occurrence

Details Some effects of geomagnetic activity and ionospheric height rises on mid-latitude spread-F occurrence Some effects of geomagnetic activity and ionospheric height rises on mid-latitude spread-F occurrence

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46...55b&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, Jan. 1984, p. 55-64.

Physics

11

Geomagnetism, Magnetic Disturbances, Midlatitude Atmosphere, Spread F, Height, Kp Index, Night Sky, Sunspot Cycle

Scientific paper

It is found that for July and August 1966 (recorded at Brisbane, Australia) there is little tendency for spread-F to occur preferentially when the base height is above the average for the period. For the September-October period, however, spread-F occurs more often (by a factor of 2 or 3 depending on the geomagnetic activity) when the base height is above rather than below the average height. The analysis also shows that the overall spread-F occurrence decreased to some extent after periods of increased geomagnetic activity. This suppressed activity in the hours subsequent to geomagnetic activity is confirmed by superposed-epoch analyses using K indices as controls. It is thought that the results of all the analyses might be explained by invoking a transition height in the ionosphere (controlled by the neutral-particle density of the upper atmosphere).

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