STUDY OF THE EARTH'S IONOSPHERE BY RECEPTION OF RADIO WAVES FROM SATELLITES.
Research rept. no. l, Sep 62-May 63,
BOSTON UNIV MASS
Pagination or Media Count:
A study of ionospheric scintillations by the reception of signals from the Russian satellite 1962 Cosmos I was undertaken. The satellite transmitted at a frequency of 20 Mcs and it was found possible to receive the first two harmonics at 40 Mcs and 60 Mcs. A high percentage of scintillation was observed on all night-time transits of the satellite. No marked variation of scintillation index with elevation angle was observed. The scintillation index varied with wavelength as lambda 0.78 for magnetically quiet days and as lambda 0.36 for magnetically disturbed days. A pronounced latitude dependence of scintillations was observed. The onset of scintillations occurred at a sub-ionospheric latitude referred to a height of 300 km of 35 degrees N on magnetically quiet days and the same effect was observed at 33 degrees N for magnetically disturbed days. A zone of almost uniform scintillation exists beyond a latitude of 41 degrees N. On certain occasions the satellite passed through clouds of irregularities, the size of which were about 550 km. Author