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The boundary conditions for the ideal MHD equations on a plane dis-continuity surface are investigated. It is shown that, for a given mass fluxthrough a discontinuity, its type depends only on the relation between inclina-tion angles of a magnetic field. Moreover, the conservation laws on a surfaceof discontinuity allow changing a discontinuity type with gradual (continu-ous) changes in the conditions of plasma flow. Then there are the so-calledtransition solutions that satisfy simultaneously two types of discontinuities.We obtain all transition solutions on the basis of the complete system ofboundary conditions for the MHD equations. We also found the expressiondescribing a jump of internal energy of the plasma flowing through the dis-continuity. Firstly, this allows constructing a generalized scheme of possiblecontinuous transitions between MHD discontinuities. Secondly, it enables theexamination of the dependence of plasma heating by plasma density andconfiguration of the magnetic field near the discontinuity surface, i.e., bythe type of the MHD discontinuity. It is shown that the best conditions forheating are carried out in the vicinity of a reconnecting current layer nearthe areas of reverse currents. The result can be helpful in explaining thetemperature distributions inside the active regions in the solar corona duringflares observed by modern space observatories in soft and hard X-rays.

MHD discontinuities in solar flares: continuous transitions and plasma heating