Accession Number : AD0479375
Title : HF COMMUNICATION EFFECTS: PHYSICS AND CHEMISTRY OF THE IONOSPHERE.
Descriptive Note : Final rept.,
Corporate Author : STANFORD RESEARCH INST MENLO PARK CA
Personal Author(s) : Whitten, R. C., Jr. ; Edmonds, R. S. ; Poppoff, I. G.
Report Date : AUG 1965
Pagination or Media Count : 186
Abstract : The ionosphere from 50 to 700 km is discussed in an attempt to provide information of value and interest to radio communicators. Diurnal, seasonal, and solar cyclical variations of the ionosphere are considered as well as effects of diffusion, turbulence and winds, tidal and wave motions, chemical reactions, and magnetic disturbances. Ionization by extreme UV photons, solar X-rays, and Lyman-alpha and cosmic radiation are presented as functions of solar activity. The ionization and deionization processes (dissociation, recombination, charge transfer, and ion-atom interchange) that control ion and electron densities in the ionosphere are discussed. Detailed models of (1) the quiet ionosphere, (2) sudden ionic disturbances, (3) polar cap absorption events, and (4) ionospheric and geomagnetic storms are developed. Current theories of ionospheric processes and phenomena are evaluated and remaining problems of interpretation pointed out. (Author)
Descriptors : *IONOSPHERIC PROPAGATION), *ATMOSPHERE MODELS), (*IONOSPHERIC DISTURBANCES, (*IONOSPHERE, (*RADIO TRANSMISSION, IONOSPHERIC PROPAGATION), WAVE PROPAGATION, COMMUNICATION AND RADIO SYSTEMS, TURBULENCE, SOLAR WIND, SOLAR FLARES, SOLAR RADIATION, HYDROSTATICS, IONIZATION, IONS, RECOMBINATION REACTIONS, REACTION KINETICS, COSMIC RAYS, HIGH FREQUENCY, LOW FREQUENCY, POLAR REGIONS, AURORAE, ELECTRON DENSITY, RESEARCH MANAGEMENT, BIBLIOGRAPHIES.
Subject Categories : Radiofrequency Wave Propagation
Distribution Statement : APPROVED FOR PUBLIC RELEASE