Nc. Rogers et al., COMPARISON OF PREDICTED AND MEASURED TIMES OF PROPAGATION OVER HIGH-LATITUDE PATHS FOR WHICH DIRECTION-OF-ARRIVAL MEASUREMENTS ARE AVAILABLE, Electronics Letters, 32(5), 1996, pp. 490-491
HF radiowave propagation over paths tangential to the auroral oval has
been observed al times appreciably different from those indicated by
conventional computer prediction codes. During these periods, large de
viations of the ray path from the great circle direction occur, sugges
ting a mode of propagation nor currently included in the prediction me
thods.