Physics – Plasma Physics
Scientific paper
Jan 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989plap.work...37h&link_type=abstract
In ESA, Proceedings of an International School and Workshop on Plasma Astrophysics, Volume 1 p 37-44(SEE N89-24910 18-75)
Physics
Plasma Physics
Auroras, Cosmic Plasma, Magnetohydrodynamic Stability, Particle Acceleration, Plasma Physics, Plasma Potentials, Field Aligned Currents, Magnetohydrodynamic Waves, Plasma Conductivity, Plasma-Electromagnetic Interaction, Solar Flares, Stellar Mass Accretion, Stress Relieving, Wave Propagation
Scientific paper
The existence of field-aligned potential drops is related to unstable field-aligned currents. It is postulated that the region of instability, once set up, can propagate spontaneously into the interior of the current circuit, like a fracture in a stressed solid body, and thus achieve a fast magnetic stress relief. Most of the released magnetic energy is converted into kinetic energy of field-aligned particle beams. Parallel voltage and energy flux depend on the primary magnetic stress, the propagation properties of shear Alfven-waves, and the threshold for current instability. Numerical examples for the efficiency of such an acceleration process for three cosmic situations are given.
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