Fluctuations in the values of the IMF components of the solar wind plasma near the front of a fast reverse shock were analyzed using the WIND satellite data with a time resolution of 11 Hz. Two ways of dividing the magnetic field vector into components were considered: according to the GSE coordinate system and relative to the normal of the interplanetary shock front. It was found that the break frequency of the fluctuation spectrum of magnetic field components in the solar wind upstream region lies in the frequency range from 0.37 to 1.37 Hz. In the solar wind downstream region, the break frequency shifts to the range of 0.45–1.58 Hz, which corresponds to the scale of the proton inertial length. The slope of the fluctuation spectra of the IMF components was shown to vary both on MHD and on transient scales, although to different degrees. On transient scales, the difference can be significant.
O. V. Sapunova (Wed,) studied this question.