A study of midlatitude spread-F

Details A study of midlatitude spread-F A study of midlatitude spread-F

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jatp...39.1347s&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 39, Nov.-Dec. 1977, p. 1347-1352.

Physics

Cross Correlation, Magnetic Variations, Midlatitude Atmosphere, Solar Activity Effects, Solar Cycles, Spread F, Atmospheric Ionization, Diurnal Variations, Geomagnetism, Hysteresis, Kp Index, Nocturnal Variations

Scientific paper

Results of a study of the occurrence of spread-F at Christchurch, New Zealand, over the period June 1965-December 1974 are presented. There is a significant positive correlation between the occurrence of spread-F in the post-midnight period and geomagnetic activity, the occurrence of spread-F lagging behind geomagnetic activity variations by one to two days. The study revealed the presence of a marked hysteresis effect in the solar cycle variation of spread-F which is found not to be due to either the combined influence of solar and geomagnetic activity or a delayed response of spread-F to solar activity. It is found that, on a statistical basis, nights with 100% spread-F activity at Christchurch, in the midlatitude trough zone, are associated with steeper latitudinal gradients in ionization around the equatorward edge of the trough compared with nights without any spread-F activity.

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