The bound-bound and free-free radiative losses for the nonthermal distributions in solar and stellar coronae

Details The bound-bound and free-free radiative losses for the nonthermal distributions in solar and stellar coronae The bound-bound and free-free radiative losses for the nonthermal distributions in solar and stellar coronae

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011a%26a...529a.103d&link_type=abstract

Astronomy & Astrophysics, Volume 529, id.A103

Astronomy and Astrophysics

Astrophysics

1

Atomic Processes, Radiation Mechanisms: Non-Thermal, Sun: Corona, Sun: X-Rays, Gamma Rays, Instabilities

Scientific paper

Context. The radiative-loss function is an important ingredient in the physics of the solar corona, transition region, and flares. Aims: We investigate the radiative losses due to the bound-bound transitions and bremsstrahlung for nonthermal κ- and n-distributions. Methods: The bound-bound radiative losses are computed by integrating synthetic spectra. An analytical expression is derived for nonthermal bremsstrahlung. The bremsstrahlung is computed numerically using accurate values of the free-free Gaunt factor. Results: We find that the changes in radiative-loss functions due to nonthermal distributions are several times greater than the errors due to the missing contribution of the free-bound continuum or errors in atomic data. For κ-distributions, the radiative-loss functions are in general weaker than for Maxwellian distribution, with a few exceptions caused by the behavior of Fe. The peaks of the radiative-loss functions are in general flatter. The situation is opposite for n-distributions, for which the radiative-loss functions have higher and narrower peaks. Local minima and maxima of the radiative-loss functions may also be shifted. The contribution from bremsstrahlung only changes by a few percent except in the extreme nonthermal case of κ = 2. Stability analysis reveals that the X-ray loops are stable against the radiatively-driven thermal instability.
The calculated radiative losses for nonthermal distributions are available as two electronic tables at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/529/A103

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