Dynamics of the Small-scale Solar Wind Structures with Sharp Boundaries Under Transfer from the Solar Wind to Magnetosheath

This paper is based on the study of small-scale and sharp plasma structures in the solar wind (SW) and their evolution during propagation through the bow shock (BS) to the magnetosheath (MSH). We have used data obtained from two closely separated THEMIS spacecraft upstream and downstream from the BS. We compare the changes of the plasma density, magnitude of the magnetic field and the duration of the same structures both in SW and in the MHS. 15 events are analyzed. We have found that these structures maintain their sharp boundaries while crossing the Earth's bow shock and coming to the magnetosheath. However, the amplitudes of changes are increased in average by 30% and the front durations are increased on average by 40%. These changes are different for the plasma density and magnetic field amplitude. We analyzed the dependence of variations of the front duration and plasma density amplitude on the upstream solar wind parameters and didn't found any correlation between them.