STRUCTURE OF INTERPLANETARY SHOCK-WAVES FROM RADIO SCINTILLATION DATA

The distributions of scintillation index in the interior region of an interplanetary shock wave are obtained by using scintillation observat ions from Pushchino, Russia. The dependence of scintillation index m o n the distance from a shock front surface Delta r is strong and can be represented by a two-component structure of distribution of turbulenc e level (delta N-e)(2). The first component occupies a narrow layer wi th thickness of about 0.02 AU and size of about 0.3 AU, in which the r elative enhancement of delta N-e is about root 15. The second componen t occupies a layer with thickness Delta r = 0.1 AU and size of about 0 .7 AU, in which the relative enhancement of delta N-e is about root 2. The typical distance of the shock front from the Sun was on the order of 1 AU in the events that we investigated.