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:

1973-03-30

Pagination or Media Count:

29.0

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