The collision of interplanetary shock waves with the bow shock wave‐magnetopause system is considered both in the gas‐dynamic and magnetohydrodynamic approximations. It is shown that the shock wave is reflected from the magnetopause as a rarefaction wave which, in turn, is reflected from the rearward side of the bow shock. This secondary rarefaction wave arrives at the magnetosphere after a time interval of 3–5 min after the interplanetary shock wave's arrival. The rarefaction wave decreases the flow pressure on the magnetosphere and causes the reverse (i.e., outward) motion of the magnetopause. With the help of an approximate solution of the differential equations the problem of rarefaction wave reflection from the magnetosphere is considered. The law of the subsolar point motion of the magnetosphere during the abrupt shock‐like perturbation is obtained. The experimental data confirm the theoretical results.

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We consider Ihe magnelohydrodynanlic (MHD) interactions of solar coronal fast shock waves o1" flare anti/or nonllarc origin ~.itll Ihe boundaries of coronal streamers and coronal holes.Boundaries arc trealed as MHD tangenlial discontinuities (TD). DilTereni pararlietcrs ol'the observed corona are used iJ] the investigation. The general case of the oblique interaction is studied.[I is shown I:hal a solar tkiSt shock wave must be refracted usually as a fasl shock wave inside the coronal streamer. For the special case of the velocity shear across TD, a slow shock wave is generated. On the contrary, Ihe shock wave reflacled inside the coronal hole is indeed a slow shock wax.e.The signilicance of different efi-ecls due Io the interaction of fasl: alld slow shock waves Oll lhe coronal magnetic fickl is noticed, especially ::it the time of a coronal mass ejection ((?ME). It is also shown, Ihal all oblique fast MHD coronal shock wave may trioger an inslability at the boundary of a streamer considered as a TD. II mighl have a relation with the observed process of abrupt disappearance of the strealner's boundary in the solar corona.