Determining the foF2 critical frequency at the path midpoint from oblique sounding data based on the Smith method

A simple method for finding the critical frequency at a path midpoint from the distance-frequency characteristic measured on the one-hop path, based on the Smith method (the transmission curve method). The proposed method is the solution of the problem for the regular ionosphere along the path; therefore the method accuracy is also estimated as applied to irregular paths. The modeling results for the Khabarovsk-Irkutsk path are considered, and the experimental results for the Magadan-Irkutsk path are presented.