Sounder-updated statistical model predictions of maximum usable frequency for HF sky wave predictions. Memorandum report

Technical Report · Wed Oct 30 04:00:00 EST 1985

OSTI ID:6060562

Reilly, M H; Daehler, M

Measured solar parameters, such as sunspot number or 10.7 cm flux, have traditionally been used as inputs to drive statistical-model predictions of maximum usable frequencies (MUFs) on HF radio sky wave paths of interest. Much greater accuracy can be obtained by using ionospheric sounder inputs to drive or update statistical-model predictions, and this is demonstrated here using oblique-incidence sounder data from the DoD Solid Shield exercises on May 12-14, 1981. From analysis of ionograms collected for several paths every fifteen minutes, it is found that deployment of a reasonable number of sounders in a large area, in order to update the simple statistical model, MINIMUF, yields MUF prediction capability on unsounded communication paths in the area within 0.4 MHz rms error. This value is obtained from real-time updating and a spatial interpolation process developed here, whereby data at sounder control points is interpolated to ionospheric reflection points for communication paths of interest. The results from the interpolation are found to be at least 20-30% more accurate than updating at any one of the nearby sounder control points. The updating procedure applies under day and night conditions, and also works well in a forecasting mode (not real-time), where it is found to work better in this case than a statistical trend line approach for daytime forecasting. (Author)

• Research Organization: Naval Research Lab., Washington, DC (USA)
• OSTI ID: 6060562
• Report Number(s): AD-A-161041/9/XAB; NRL-MR-5677
• Country of Publication: United States
• Language: English

Related Subjects

640104* -- Astrophysics & Cosmology-- Solar Phenomena
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Ionospheric
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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
DATA ANALYSIS
EARTH ATMOSPHERE
ELECTRONIC EQUIPMENT
EQUIPMENT
F REGION
IONOSONDES
IONOSPHERE
MATHEMATICAL MODELS
PERFORMANCE
PLANETARY IONOSPHERES
RADIATIONS
RADIO EQUIPMENT
SOLAR ACTIVITY
SOLAR RADIATION
STARSPOTS
STELLAR ACTIVITY
STELLAR RADIATION
SUNSPOTS