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Title:
Modeling the Radiative Signatures of Turbulent Heating in Coronal Loops
Authors:
Parenti, S.; Buchlin, E.; Cargill, P. J.; Galtier, S.; Vial, J.-C.
Affiliation:
AA(Institut d'Astrophysique Spatiale, Batiment 121, F-91405 Orsay, France ), AB(Dipartimento di Astronomia e Scienza dello Spazio, Università di Firenze, Largo E. Fermi 2, 50125 Florence, Italy), AC(Space and Atmospheric Physics, Blackett Laboratory, Imperial College, London SW7 2BZ, UK), AD(Institut d'Astrophysique Spatiale, Batiment 121, F-91405 Orsay, France; and Université Paris-Sud 11 and CNRS (UMR 8617)), AE(Institut d'Astrophysique Spatiale, Batiment 121, F-91405 Orsay, France; and Université Paris-Sud 11 and CNRS (UMR 8617))
Publication:
The Astrophysical Journal, Volume 651, Issue 2, pp. 1219-1228. (ApJ Homepage)
Publication Date:
11/2006
Origin:
UCP
Astronomy Keywords:
Methods: Statistical, Magnetohydrodynamics: MHD, Sun: Corona, Sun: Flares, Sun: UV Radiation, Techniques: Spectroscopic, Turbulence
DOI:
10.1086/507594
Bibliographic Code:
2006ApJ...651.1219P

Abstract

The statistical properties of the radiative signature of a coronal loop subject to turbulent heating obtained from a three-dimensional (3D) magnetohydrodynamics (MHD) model are studied. The heating and cooling of a multistrand loop is modeled and synthetic spectra for Fe XII 195.12, Fe XV 284.163, and Fe XIX 1118.06 Å are calculated, covering a wide temperature range. The results show that the statistical properties of the thermal and radiative energies partially reflect those of the heating function in that power-law distributions are transmitted, but with very significant changes in the power-law indices. There is a strong dependence on the subloop geometry. Only high-temperature radiation (~107 K) preserves reasonably precise information on the heating function.
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