Auroral acceleration in astrophysical plasmas

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Neutron Stars, Magnetohydrodynamics And Plasmas, Novae, Dwarf Novae, Recurrent Novae, And Other Cataclysmic Variables, Cataclysmic Binaries, Symbiotic Stars

Scientific paper

The essentials of the auroral acceleration process are summarized, and a simple set of relations is derived which enables the analysis of parallel potential drops and related parameters in relevant astrophysical systems. The main condition for the occurrence of such potential drops is the existence of intense field-aligned currents driven by forces in the outer, weak magnetic fields of an astrophysical object. In the strong fields near the object the currents may reach a critical limit where the mirror force or current-driven anomalous resistivity require the setup of parallel potential drops for the maintenance of current continuity. Analysis of three candidate systems, solar flares, cataclysmic variables and accreting neutron stars, reveals the possibility of fast and efficient production of highly relativistic electrons manifesting themselves by gamma ray emission.

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