  In solar cycles 23-24, solar activity noticeably decreased, and, as a result,
solar wind parameters decreased. Based on the measurements of the OMNI base for
the period 1976-2019, the time profiles of the main solar wind parameters and
magnetospheric indices for the main interplanetary drivers of magnetospheric
disturbances (solar wind types CIR, Sheath, ejecta and MC) are studied using
the double superposed epoch method. The main task of the research is to compare
time profiles for the epoch of high solar activity at 21-22 solar cycles and
the epoch of low activity at 23-24 solar cycles. The following results were
obtained. (1) The analysis did not show a statistically significant change in
driver durations during the epoch of minimum. (2) The time profiles of all
parameters for all types of SW in the epoch of low activity have the same shape
as in the epoch of high activity, but locate at lower values of the parameters.
(3) In CIR events, the longitude angle of the solar wind flow has a
characteristic S-shape, but in the epoch of low activity it varies in a larger
range than in the previous epoch.
