Sounderupdated statistical model predictions of maximum usable frequency for HF sky wave predictions
Abstract
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 obliqueincidence sounder data from the DoD Solid Shield exercises on May 1214, 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 realtime 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 2030% 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 realtime), where it is found to work better in this case than a statistical trend line approach for daytime forecasting.
 Publication:

NASA STI/Recon Technical Report N
 Pub Date:
 October 1985
 Bibcode:
 1985STIN...8619500R
 Keywords:

 Atmospheric Sounding;
 Earth Ionosphere;
 Mathematical Models;
 Maximum Usable Frequency;
 Prediction Analysis Techniques;
 Sky Waves;
 Statistical Analysis;
 F Region;
 High Frequencies;
 Interpolation;
 Solar Radiation;
 Sunspots;
 Communications and Radar