Accession Number : AD0760685

Title :   A D-Region Model Which Accounts for Quiet and Disturbed VLF Propagation Phenomena.

Descriptive Note : Research rept. Jul 72-Jan 73,

Corporate Author : NAVAL ELECTRONICS LAB CENTER SAN DIEGO CALIF

Personal Author(s) : Bleiweiss,M. P. ; Hildebrand,V. E. ; Hill,J. R.

Report Date : 30 MAR 1973

Pagination or Media Count : 29

Abstract : The work reported in the report is part of a continuing program to devise and test atmospheric models for use in radio wave propagation prediction. The requirement to be met was to build a time-varying model of the D-region of the ionosphere which, when used in vlf propagation models, could account for vlf propagation phenomena observed during ambient conditions and during the times when a solar X-ray flare was in progress. A further objective was to test the validity of a model having a minimum of complexity. The model presented here succeeds in the grosser aspects but will require further work to acquire a detailed match between the observed and predicted propagation.

Descriptors :   (*IONOSPHERIC DISTURBANCES, MATHEMATICAL MODELS), (*IONOSPHERIC PROPAGATION, ATMOSPHERE MODELS), VERY LOW FREQUENCY, ELECTRON DENSITY, SOLAR FLARES, RADIOFREQUENCY INTERFERENCE

Subject Categories : Atmospheric Physics
      Radiofrequency Wave Propagation

Distribution Statement : APPROVED FOR PUBLIC RELEASE