Accession Number : AD0892151

Title :   Auroral Zone Effects on Omega.

Descriptive Note : Technical note,

Corporate Author : NAVAL ELECTRONICS LAB CENTER SAN DIEGO CA

Personal Author(s) : Rothmuller, I. J.

Report Date : 12 JUN 1969

Pagination or Media Count : 31

Abstract : It has been previously shown that there is an ionizing mechanism -- electron precipitation -- which governs the structure of the D-region present at high latitudes but which is not present at mid- and low-latitudes. Because of the geometry of the earth's magnetic field, the flux and energy of the precipitating electrons is a function of latitude and the deviation of the auroral zone D-region due to the precipitating electrons is also latitude dependent. Consequently, the reflection height of a VLF radio wave traversing the auroral zone also is a function of latitude. To provide a correction to the present Omega skywave prediction for paths traversing the auroral zone, the 'auroral zone profile' (the variation in reflection height with latitude) must be found. Seasonal variations and other variations (e.g., solar activity, etc.) must be found as well.

Descriptors :   *RADIO TRANSMISSION), (*AURORAE, IONOSPHERE, POLAR REGIONS, GEOMAGNETISM, ELECTRON DENSITY, DIURNAL VARIATIONS, PERIODIC VARIATIONS, VERY LOW FREQUENCY, REFLECTIVITY, ALTITUDE, ABSORPTION.

Subject Categories : Atmospheric Physics
      Radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE