Modeling solar flare conduction fronts. I - Homogeneous plasmas and ion-acoustic turbulence.

Details Modeling solar flare conduction fronts. I - Homogeneous plasmas and ion-acoustic turbulence. Modeling solar flare conduction fronts. I - Homogeneous plasmas and ion-acoustic turbulence.

Nov 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...364..295m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 364, Nov. 20, 1990, p. 295-321.

Computer Science

Sound

8

Electric Fields, Ion Acoustic Waves, Plasma Turbulence, Solar Corona, Solar Flares, Chromosphere, Coronal Loops, Electron Energy, Hot Electrons, Solar X-Rays, Temperature Distribution

Scientific paper

A one-dimensional, electrostatic, particle-in-cell simulation is used here to model the expansion of a heated electron population in a coronal loop during a solar flare and the characteristics of the associated X-ray emissions. The hot electrons expand outward from the localized region, creating an ambipolar electric field which accelerates a return current of cooler, ambient electrons. Ion-acoustic waves are generated by the return currents as proposed by Brown et al. (1979), but they play little or no role in containing energetic electrons and the conduction front proposed by Brown et al. does not form. The X-ray emission efficiency of the electrons is too low in the corona for them to be the source of hard X-ray bursts. The particle dynamics changes dramatically if the heated plasma is at low altitudes and expands upward into the more tenuous plasma at higher altitudes. Two important applications of this finding are the radio-frequency heating of the corona and the collisional heating of the chromosphere by precipitating energetic electrons. In both cases, the overlying plasma has a density that is too low to supply a balancing return current to the expanding hot electrons. As a result, an ambipolar electric field develops that tends to confine the energetic electrons behind a front that propagate outward at about the speed of sound.

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