Accession Number : AD0759258

Title :   The Magnetosphere as a Communication Medium at Very Low Frequencies.

Descriptive Note : Rept. for Jan 71-Nov 72,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Koons,Harry C.

Report Date : 28 FEB 1973

Pagination or Media Count : 28

Abstract : The potential exists for communications at very low frequencies (<30 kHz) from a satellite-borne transmitter to receivers with subsurface-antennas. A calculation of the link margin must include plasma antenna effects, coupling to the whistler mode of propagation, ducting through the plasma medium, wave-particle interactions along the propagation path, transmission through the ionosphere, and finally coupling to the subsurface antenna through the earth-ionosphere wave guide. Propagation will also be characterized by multipath ducting in electron density troughs and gradient ducting by the plasmapause. The observational evidence for each of these phenomena is reviewed, and the physics of each is discussed with specific reference to the implications of each for a satellite-to-ground VLF communication link. (Author Modified Abstract)

Descriptors :   (*COMMUNICATION AND RADIO SYSTEMS, VERY LOW FREQUENCY), (*RADIO TRANSMISSION, SPACE TO SURFACE), MAGNETOSPHERE, IONOSPHERIC PROPAGATION, WHISTLERS

Subject Categories : Radiofrequency Wave Propagation
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE