Physics
Scientific paper
May 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jatp...42..437o&link_type=abstract
Journal of Atmospheric and Terrestrial Physics, vol. 42, May 1980, p. 437-441.
Physics
1
Atmospheric Attenuation, Ionospheric Disturbances, Ionospheric Propagation, Prediction Analysis Techniques, Radio Attenuation, Annual Variations, Broadcasting, Diurnal Variations, High Frequencies, Solar X-Rays, Sporadic E Layer
Scientific paper
A general empirical formula has been obtained for successfully predicting and forecasting HF absorption on global basis. It is shown that by the explicit inclusion of an ionizing flux term in the formula, the necessity for two different cos chi laws for the diurnal and seasonal variations, which had hitherto been the case, has been removed. Even though 1-8 A solar X-ray flux may not necessarily be considered a major source of ionization in the D region, particularly during quiet conditions, 2.2 MHz absorption has been found to respond significantly to changes in this band of X-ray flux and the threshold level of the X-ray flux for this response could be as low as 0.2 x 10 to the -4th erg/sq cm s.
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