ИСТИНА

During many years there were observations of echo-signals in different radio physical experiments. One of the reasons of echo phenomena can be propagation of a signal along a magnetic line to the conjugate hemisphere and back to the transmitter. The experimental evidences of such a mechanism were given for the middle latitudes. In the Geophysical Observatory Loparskaya (LOP, 68.25 N, 33.08 E; Ф = 64.52 N, 113.9 E, L = 5.2) a ground facility for observations of this kind of radio echoes in the high-latitude region has been constructed. It is a modified ionosonde with additional equipments which permit to investigate a chosen range of time delay. The first experiments have shown the possibility of the facility to be used for investigation of radioechoes.