Abstract
Abstract—Nonequilibrium distributions of cosmic rays accelerated by the Fermi mechanism are formed by multiple interactions with magnetic fluctuations in the upstream region of a collisionless shock. The shock ram pressure is transferred to accelerated cosmic rays, which may in turn amplify the magnetic turbulence. A short-wave plasma instability induced in the upstream region of a collisionless shock caused by the interaction between cosmic rays and the background plasma is discussed.
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