Daily Mid-Latitude F2-Region Critical Frequency foF2 Variation with Daily Sunspot Number R (P2)

Details Daily Mid-Latitude F2-Region Critical Frequency foF2 Variation with Daily Sunspot Number R (P2) Daily Mid-Latitude F2-Region Critical Frequency foF2 Variation with Daily Sunspot Number R (P2)

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006ihy..worke..94a&link_type=abstract

2nd UN/NASA Workshop on International Heliophysical Year and Basic Space Science. Proceedings of the conference held 27 Novembe

Astronomy and Astrophysics

Astrophysics

Scientific paper

Ionosonde data recorded at Kokubunji, Japan (Latitude 35.7 N; Longitude 139.5 E) during a year of low solar activity (1994) and high solar activity (1990) were used in our research work to study the correlation between daily sunspot numbers (R) and the daily mid - latitude F region critical frequency (foF2) for four seasons (Spring, March; Summer, June; Autumn, October; Winter, December). There is a diurnal variation of (foF2) with (R). Trends found over years of solar maximum (1990) are more positive in March and December, but negative in June and October. The year of solar minimum (1994) there are positive trends in June and October, but negative trends in March and December.

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