Accession Number : AD0869932

Title :   Solar Influences on HF Absorption and the Resulting Hawaii to California Lowest Observed Frequency.

Descriptive Note : Technical publication Oct 69-Jan 70,

Corporate Author : NAVAL WEAPONS CENTER CHINA LAKE CA

Personal Author(s) : Bleiweiss, Max P.

Report Date : MAY 1970

Pagination or Media Count : 48

Abstract : The theory of the absorption of high frequency (HF) radio waves is presented and used to determine the expected lowest observed frequency (LOF). Next, experimental LOFs obtained with an HF oblique incidence sounder receiver on the Hawaii-California propagation path are presented and compared with the absorption theory. The LOFs are also compared with the CNO predictions. The conclusions are that the LOF is not influenced appreciably by a varying component of background solar radiation, or seasonal changes, and that the LOF is a predictable quantity which closely follows the theory. (Author)

Descriptors :   (*IONOSPHERIC PROPAGATION, SOLAR RADIATION), (*RADIO WAVES, ABSORPTION), IONIZATION, HIGH FREQUENCY, ELECTRON DENSITY, MATHEMATICAL PREDICTION, TRANSMITTER RECEIVERS, BANDWIDTH, CALIFORNIA, HAWAII.

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE