ИСТИНА

The report is devoted to the modification of the solar wind (SW) structures during transferring through the bow shock and magnetosheath (MSH). The study is based on the correlation analysis of data obtained from two closely located THEMIS spacecrafts placed in SW and MSH simultaneously. We find out that bow shock and MSH typically add only high frequency fluctuations (with frequencies exceeding 0.01-0.02 Hz) to the variations of solar wind parameters. We observed time variations of correlation coefficient calculated on 2-hour and 30-minute data intervals. We find that that small-scale solar wind structures are extremely modified in MSH though structures of larger scales transfer to the MSH without modification. We suggest that the amplitude of structure , amplitude of IMF and the value of the density of the solar wind plasma are the main parameters controlling the level of modification of the solar wind structure’s in MSH.