The trajectories of U-type solar radio bursts

The computation is presented of the trajectory of the U-type solar radio burst of 18 Oct., 1974. The correction is also presented of this trajectory with respect to the finite velocity of radio-wave propagation and an attempt is made at comparing the trajectory arcs of the disturbance with the angular dimensions of a sunspot group. In the special case when the sunspot group is located at the solar limb, the comparison of the size of the corrected trajectory arcs with the size of the sunspot group makes it possible to select trajectories by means of the elimination method, to determine the preference of the trajectory for a certain direction and orientation relative to the observer and thereby to determine the possible actual trajectory. (author)