Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010apj...711..185c&link_type=abstract
The Astrophysical Journal, Volume 711, Issue 1, pp. 185-191 (2010).
Astronomy and Astrophysics
Astronomy
7
Methods: Numerical, Radiative Transfer, Sun: Atmosphere, Sun: Flares
Scientific paper
It is believed that solar white-light flares (WLFs) originate in the lower chromosphere and upper photosphere. In particular, some recently observed WLFs show a large continuum enhancement at 1.56 μm where the opacity reaches its minimum. Therefore, it is important to clarify how the energy is transferred to the lower layers responsible for the production of WLFs. Based on radiative hydrodynamic simulations, we study the role of non-thermal electron beams in increasing the continuum emission. We vary the parameters of the electron beam and disk positions and compare the results with observations. The electron beam heated model can explain most of the observational white-light enhancements. For the most energetic WLFs observed so far, however, a very large electron beam flux and a high low-energy cutoff, which are possibly beyond the parameter space in our simulations, are required in order to reproduce the observed white-light emission.
Carlsson Mats
Cheng Jian-Xia
Ding Ming-De Ding
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