Geophysical conditions for round-the-world propagation of HF radio signals

In this work we study properties of RTW signals using data obtained over Magadan-Tory path during several days on June, October and December, 2000. The coordinates of the transmitter location are 60.1N, 150.7E, the coordinates of the receiver location are 51.8N, 103E. In our study we calculated F2-region critical frequencies (foF2) over the RTW path using International Reference Model (IRI). For the calculation of HF radio wave propagation parameters we used the program functioning on the basis of a waveguide approach. We compare experimentally obtained RTW frequency characteristics with calculated maximum usable frequencies (MUF). We analyze foF2 calculated over RTW propagation path with the aim to determine the most favorable conditions of RTW signals propagation.