Prediction of azimuthal angle of arrival of HF waves during the sunrise period


  • N. Narayana Rao,

  • R. I. Beckwith


A previously reported method of application of ionospheric predictions to HF propagation in three dimensions is employed for an investigation of the monthly mean predicted behavior of the azimuthal angle of arrival of HF signals during the sunrise period for a medium range, midlatitude path oriented 27° east from north. A comparison of the prediction model results with experimental data collected over a five-day period each month for twelve months shows that the use of the prediction model offers a significant overall improvement in reducing the errors due to the azimuthal angle-of-arrival deviations from the great circle azimuth. The factors contributing to the discrepancies between the prediction model results and experimental observations are examined.