Accession Number : AD0663663

Title :   VHF REFRACTION AND SCATTERING BY VISIBLE AURORAL FORMS,

Corporate Author : BOEING SCIENTIFIC RESEARCH LABS SEATTLE WASH GEO-ASTRO PHYSICS LAB

Personal Author(s) : Fremouw,E. J. ; Lansinger,J. M.

Report Date : SEP 1967

Pagination or Media Count : 21

Abstract : Two relatively new techniques, one analytical and one observational, have been applied to the problem of differential phase shifting of radio waves by the aurora. The radio measurements used were interferometer observations of Cassiopeia A. The analytical technique consists of computing the Kirchhoff-Fresnel diffraction integral for models of wavefront perturbation produced in the ionosphere, the results being compared in detail with interferometer records of isolated refraction events. All-sky-camera and photometer records show many of these events to be directly related to passage of auroral forms through the radio line of sight. Random-scatter events have been analyzed stochastically and compared in detail with the aurora in and near the line of sight. For this comparison, a high-sensitivity television camera was mounted on one of the tracking antennas, providing movies of the aurora with a time resolution of 100 milliseconds and comprising the new observational technique. (Author)

Descriptors :   (*IONOSPHERIC PROPAGATION, *AURORAE), PHASE SHIFT CIRCUITS, SCATTERING, MATHEMATICAL ANALYSIS, REFRACTION, RADIO WAVES, VERY HIGH FREQUENCY, INTERFEROMETERS, TELEVISION EQUIPMENT

Subject Categories : Atmospheric Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE