ИСТИНА

In this paper we study the fine structure of the solar wind ion flux at the fronts of bow (BS) and interplanetary (IPS) shocks on the basis of data analysis of plasma spectrometer BMSW onboard the high apogee satellite SPEKTP-R. Measurements with high time resolution 31 ms allowed to study the fine structure of the plasma fronts with durations varying from parts of second (for IPS) till few seconds (for BS). Accordingly to the different speeds of the motion of these shocks and durations of their fronts the thickness of plasma fronts varies between several tens (for BS) to several hundred (for IPS) km. It is seen from observations that some of these fronts have a laminar type of increasing in ion flux, while another part of these fronts demonstrates quasi-harmonic type of the changes of value and direction of ion flux with periods in the range 0.2-1.0 seconds. Relationship between the structure of the shock fronts, solar wind conditions and main MHD parameters is analyses. Also the levels of plasma density fluctuations before and after shock fronts are compared.