Morphology of NmF2 nighttime increases in the Eurasian sector

Details Morphology of NmF2 nighttime increases in the Eurasian sector Morphology of NmF2 nighttime increases in the Eurasian sector

Jun 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000angeo..18..618m&link_type=abstract

Annales Geophysicae, vol. 18, Issue 6, pp.618-628

Mathematics

Probability

8

Scientific paper

A statistical analysis of two peaks (pre-midnight and post-midnight) occurrence in NmF2 daily variations was made on a latitudinal chain of four ionosonde stations in the Eurasian longitudinal sector. Overall 6182 cases of the first and 5600 cases of the second peak occurrence were analyzed using all available foF2 observations for the years of solar maximum and minimum. Well-pronounced and systematic variations with season and solar activity were revealed in the occurrence probability of the peaks, their amplitude and timing. The pattern of both peaks occurrence is similar during winter and equinoxes for midlatitude stations implying one and the same mechanism of their formation. The pre-midnight summer peak shows specific variations in particular during solar maximum pointing to a different mechanism controlling its appearance. Possible mechanisms of both peaks formation are discussed.

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