Chromospheric evaporation velocities in solar flares

Details Chromospheric evaporation velocities in solar flares Chromospheric evaporation velocities in solar flares

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281l..79f&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 281, June 15, 1984, p. L79-L82.

Computer Science

Sound

29

Chromosphere, Evaporation Rate, Solar Flares, Solar X-Rays, Constraints, Hydrodynamics

Scientific paper

It is shown that the upper limit to chromospheric evaporation velocities in solar flare loops is 2.35 Cs, where Cs is the sound speed in the evaporated material. Upward velocities greater than this limit would imply the existence of additional nonhydrodynamic forces. Several hydrodynamic calculations are made of collisional heat produced by nonthermal energetic electrons, and upward velocities are found which are at the upper limit of large (less than 3 x 10 to the 10th ergs/sec/sq cm) energy flux values. At more modest fluxes (10 to the 10th or 10 to the 9th ergs/sec/sq cm) both thermal and thick target models yield upward velocities which are within 10 to 20 percent of the upper limit. When both temperature and velocity of the evaporated plasma are considered, the thermal model is found to be the most consistent with recent observational data.

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