Computer Science – Sound
Scientific paper
Mar 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23..409h&link_type=abstract
Planetary and Space Science, vol. 23, Mar. 1975, p. 409-418.
Computer Science
Sound
2
Collisionless Plasmas, Cosmic Plasma, Ion Acoustic Waves, Particle Acceleration, Plasma Turbulence, Drift Rate, Electric Fields, Electrical Resistivity, Electron Trajectories, Lines Of Force, Magnetic Fields, Mean Free Path, Neutral Sheets
Scientific paper
An astrophysical electron acceleration process is described which involves turbulent plasma effects: the acceleration mechanism will operate in 'collision-free' magnetoactive astrophysical plasmas when ion-acoustic turbulence is generated by an electric field which acts parallel to the ambient magnetic lines of force. The role of 'anomalous' (ion-sound) resistivity is crucial in maintaining the parallel electric field. It is shown that, in spite of the turbulence, a small fraction of the electron population can accelerate freely, i.e., runaway, in the high parallel electric potential. The number density n(B) of the runaway electron component is of order n(b) approximately equal to n/2(cs/U-)(cs/U-), where n = background electron number density, cs = ion-sound speed and U- = relative drift velocity between the electron and ion populations. The runaway mechanism and the number density n(B) do not depend critically on the details of the non-linear saturation of the ion-sound instability.
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