Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008apj...687.1363b&link_type=abstract
The Astrophysical Journal, Volume 687, Issue 2, pp. 1363-1372.
Astronomy and Astrophysics
Astronomy
3
Sun: Activity, Sun: Corona, Sun: Magnetic Fields, Sun: Uv Radiation
Scientific paper
Previous studies have been able to reproduce both the observed intensities and the morphology of high-temperature solar plasma using steady state heating models. These models, however, have been unable to reproduce the lower temperature emission observed in active regions. Here we present results from numerical simulations of a coronal bright point. We use potential field extrapolations of a Kitt Peak magnetogram to compute the coronal field lines and populate them with solutions to the hydrostatic loop equations based on a volumetric heating function that scales as B¯/L, where B¯ is the magnetic field strength averaged along a field line and L is the loop length. We consider the effects of altering the magnitude and scale height of the energy deposition and the effect of allowing the loop cross sections to expand proportionally to 1/B¯. We then use the computed densities and temperatures to calculate average intensities and simulated EUV and soft X-ray images and compared them to Yohkoh and SOHO observations. We find that our best-case model (apex heating of expanding loops) can reproduce the high-temperature emission, the general morphology of the lower temperature emission, and the majority of the average intensities of reliable lines over a wide range of temperatures to within ~20%. The morphology in the EUV visualizations, however, shows some differences from the observations. These results suggest the role of nonpotential or evolving magnetic fields, or dynamic processes, but indicate that departures from the potential field hydrostatic case may not be too large.
Brooks David H.
Warren Harry P.
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