Abstract
The variations in the parameters of twice ionized helium ions He++ of solar wind plasma during the passage of the front of the interplanetary shock are studied. Data taken from measurements by the Bright Monitor of Solar Wind (BMSW) installed onboard SPEKTR-R satellite were used to calculate the parameters of the He++ ions: the speed, temperature, and absolute and relative density (helium abundance). It was found that the absolute density of He++ ions behind the front of the interplanetary shock increases and that the relative density decreases. The average helium abundance behind the shock front was slightly less (by 9%) than that in the unperturbed region. The change in helium abundance correlated with the parameter θBn: the lower the θBn value is, the higher helium abundance decrease behind the front of the interplanetary shock.
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