Nonlinear forecasts of ƒoF2: variation of model predictive accuracy over time
- Centre for RF Propagation and Atmospheric Research, QinetiQ, Malvern, UK
- *Also at the Department of Electronic and Electrical Engineering, University of Bath, UK
- Correspondence to: A. H. Y. Chan (achan@QinetiQ.com)
Abstract. Space weather effects can strongly influence high-frequency (HF) communications by changing the ionospheric environment through which the radio waves propagate. Since many systems utilize HF communications, the ability to make real-time assessments of propagation conditions is an important part of space weather monitoring systems. In this paper, we present new techniques for measuring high-latitude HF communications link parameters using data from SuperDARN radars. These techniques use ground-scatter returns to define the variation in skip distance with frequency. From these data, the maximum usable frequency (MUF) as a function of range is determined and ionospheric critical frequencies are estimated. These calculations are made in near-real-time and the results are made available on the World Wide Web. F-region critical frequencies calculated using this method show good agreement with ionosonde data.
Key words. Ionosphere (active experiments; instruments and techniques) – Radio science (ionospheric propagation)