Physics
Scientific paper
Jun 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..401d&link_type=abstract
Annales Geophysicae (ISSN 0939-4176), vol. 9, June 1991, p. 401-406.
Physics
2
Critical Frequencies, Diurnal Variations, F 2 Region, Ionospheric Propagation, Europe, Harmonic Analysis, Solar Terrestrial Interactions, Thematic Mapping
Scientific paper
The method of Spherical Cap Harmonic Analysis has been applied to the critical frequency of the F2 layer, observed at several European vertical incident ionospheric stations. The aim was the regional mapping and modeling of this parameter in Europe. To enable this, a spherical cap including Europe, centered at 50 deg N, 14 deg E with a half-angle of 20 deg has been considered. The model is based on the expansion of Fourier longitudinal series and Legendre colatitudinal functions as the orthogonal basis functions over the caplike region of interest. It has been found that only 9 coefficients of the Spherical Cap Harmonic expansion, truncated at the integral Haines' index K = 2, are necessary to well portray the basic features of the critical frequency in the considered region.
Cander Lj R.
de Franceschi Giorgiana
de Santis Angelo
Pau Silvia
Zolesi Bruno
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