Chromospheric downflow velocities as a diagnostic in solar flares |
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Authors: | G H Fisher |
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Institution: | (1) Institute for Astronomy, University of Hawaii, 96822 Honolulu, HI, USA;(2) Institute of Geophysics and Planetary Physics Lawrence Livermore National Laboratory, 94550 Livermore, CA, USA |
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Abstract: | We explore the dynamics of chromospheric condensations driven by evaporation during the impulsive phase of solar flares. Specifically, we find that the maximum chromospheric downflow speed obeys the approximate relation
d
= 0.4 (F/
ch
)1/3, where F is that part of the flare energy flux driving chromospheric evaporation, and
ch
is the mass density in the preflare chromosphere just below the preflare transition region. This implies that chromospheric downflows as measured by H asymmetries may be a powerful probe of flare energetics. |
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Keywords: | |
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