Ionospheric absorption at the magnetic equator using the A1 technique

Details Ionospheric absorption at the magnetic equator using the A1 technique Ionospheric absorption at the magnetic equator using the A1 technique

Nov 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jatp...40.1211p&link_type=abstract

Journal of Atmospheric and Terrestrial Physics, vol. 40, Oct.-Nov. 1978, p. 1211-1217.

Physics

Atmospheric Attenuation, Electromagnetic Absorption, Equatorial Atmosphere, Ionospheric Propagation, Radio Attenuation, Annual Variations, Centimeter Waves, Diurnal Variations, Frequency Response, Long Term Effects, Radio Frequencies, Solar Activity Effects, Solar Flux, Solar X-Rays

Scientific paper

A1 absorption data on four operating frequencies, 1.8, 2.0, 2.2 and 2.5 MHz over a period of two years (1972-74) at Trivandrum (dip 0.6 deg S, geograph. lat. 8.6 deg N, long. 76.9 deg E) has been analyzed to study its diurnal, long term, and frequency variations. An empirical relation has been established between noon absorption and solar X-ray and 10.7 cm fluxes. Using this relation, the seasonal cos chi index has been evaluated. The deviation of the estimated absorption using this empirical relation from the observed absorption is found to be less than 10%.

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