Physics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988soph..115..149t&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 115, no. 1, 1988, p. 149-160.
Physics
10
Direct Current, Electric Fields, Electron Acceleration, Ion Acoustic Waves, Solar X-Rays, Coronal Loops, Current Density, Electrical Resistivity, Field Aligned Currents, Fokker-Planck Equation, Time Dependence, Turbulence Effects
Scientific paper
A time-dependent Fokker-Planck equation was numerically solved to demonstrate the dynamics of electrons in a uniform coronal loop with an applied axial dc electric field in the presence of ion-sound waves. This electric field is attributed to an anomalous resistivity due to the ion-sound turbulence caused by an initially given critical current density. The electron momentum distribution becomes a steady state in the whole turbulent region in a short time for which some electrons can be accelerated to the maximum electric potential Kc. The steady energy distribution of electrons flowing out the end of the turbulent region has a very hard power-law-like spectrum with an index of about 0.75. The associated hard X-rays from a thick target also show a hard spectrum with a photon spectral index of 1.3.
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