On the prediction of F1 ledge occurrence and critical frequency

Details On the prediction of F1 ledge occurrence and critical frequency On the prediction of F1 ledge occurrence and critical frequency

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997adspr..20.1773s&link_type=abstract

Advances in Space Research, Volume 20, Issue 9, p. 1773-1775.

Mathematics

Probability

2

Scientific paper

The probability of occurrence of F1 ledge is presented for different solar position and activity conditions by using the hourly ionogram scaling information given by the monthly bulletins of ionospheric data. The information considered includes cases of L condition. An updated and selected data base is used to test the Du Charme et al. (1973) formula adopted in the IRI model taking into account alternative solutions for the particular restrictions imposed by the IRI for high values of solar zenith angle. Special attention is given to the critical frequency prediction for twilight hours.

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