Accession Number : ADP006300

Title :   Effects of Absorption on High Latitude Meteor Scatter Communication Systems,

Corporate Author : GEOPHYSICS LAB (AFSC) HANSCOM AFB MA

Personal Author(s) : Ostergaard, J. C. ; Weitzen, J. A. ; Kossey, P. A. ; Bailey, A. D. ; Bench, P. M.

Report Date : 03 MAY 1990

Pagination or Media Count : 14

Abstract : Data acquired with the Geophysics Laboratory's High Latitude Meteor Scatter Test-Bed between Sondrestrom Air Base and Thule Air Base. Greeland during the solar disturbances of March and August, 1989 are presented. These events provided a unique opportunity to observe a number of naturally occurring disturbance effects on meteor scatter links operating in the frequency range (35 to 147 MHz) covered by the test-bed. The effects range from signal absorption to system noise variations. The properties of ionospheric absorption in general is discussed and illustrated with computations using electron density profiles from the September 1978 Solar Proton Event (SPE). It has been found that accurate measurements of high levels of ionospheric absorption with riometers pose special problems. These problems are identified and discussed. The data acquired during the March and August solar disturbances are then related to the zenith absorption measured at Thule, and the influence of absorption, as well as system noise variations are discussed.

Descriptors :   *RADIO LINKS, *IONOSPHERIC PROPAGATION, *BURST TRANSMISSION, IONIZATION TRAILS, RADIATION ABSORPTION, TEST BEDS, HIGH LATITUDES, VERY HIGH FREQUENCY, GREENLAND.

Subject Categories : Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE