HIGH-ALTITUDE EXPLOSIONS AND THEIR MAGNETOHYDRODYNAMIC DESCRIPTION

The paper provides approaches for formulating general ideas of a gas d ynamic stage for an explosion in the upper atmosphere in which the geo magnetic field is of importance. Various versions concerned with magne tic pressure influence, particle collisions, and the latitudinal atmos phere nonuniformity are discussed. The following magnetogasdynamic mod els are constructed: 1) a quasitwo-dimensional model which treats the spherically symmetric flows with the magnetic force averaged over angl es, 2) a two-dimensional model, and 3) a three-dimensional model. The latter model is applied to a general case of an arbitrary directed mag netic field. The computational results obtained for particular flows a ccording to the magnetohydrodynamic (MHD) models are given. In the nex t paper we substantiate the MHD-theory application even for very raref ied magnetized plasma.