Accession Number:

ADA191913

Title:

Comparison with Oblique Sounder Data of High-Latitude HF Propagation Predictions from 'Radar C' and 'AMBSCOM' Computer Programs.

Descriptive Note:

Professional paper for May 87,

Corporate Author:

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Personal Author(s):

• Dave, Nikhil

Report Date:

1987-11-01

Pagination or Media Count:

11.0

Abstract:

A study is done using two HF propagation prediction programs - Radar C and AMBCOM - to determine how well they predict median values of oblique sounder data of maximum observed frequencies MOF at high latitudes. The main differences between RADAR C and AMBCOM are the inclusion in the latter of high-latitude ionosphere and auroral absorption models, as well as a more sophisticated and accurate ray-tracing scheme. The data for the Winnipeg-Resolute Bay corresponds to high sunspot number, while the others correspond to low sunspot number. Hence, this study provides information on the performance of the two programs for various high-latitude paths at both high and low sunspot number. AMBCOM was found to give generally better agreement with the above data than did RADAR C. Comparison of details of model predictions from the two computer programs for the above data-base is used to form an understanding of this improvement in prediction capability.

Descriptors:

• *COMPUTER PROGRAMS
• *HIGH FREQUENCY
• *HIGH LATITUDES
• *PROPAGATION
• *RADIATION ABSORPTION
• AURORAE
• IONOSPHERE
• MODELS
• PATHS
• PREDICTIONS
• RADAR
• RAY TRACING
• SOUNDING
• SUNSPOTS

Subject Categories:

• Computer Programming and Software
• Radiofrequency Wave Propagation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE