Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...267..566p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 267, no. 2, p. 566-576.
Astronomy and Astrophysics
Astrophysics
18
Coronal Loops, Magnetohydrodynamic Flow, Plasma Heating, Solar Flares, Viscosity, Electron Beams, Stellar Models, X Ray Spectra
Scientific paper
We discuss the importance of compressional viscosity for a correct description of flare plasma dynamics and for its diagnostics with high resolution soft X-ray spectroscopy. We have separated the influence of viscosity from that of other physical effects at work during flares by comparing hydrodynamic simulations differing only for the presence or absence of viscosity. We show that the influence is significant on the flaring plasma dynamics as well as on the relevant spectra, when the flare heating is mostly delivered either at the loop apex or by means of low-energy-cutoff nonthermal electron beams. For base-heated loop flares, instead, the effect of viscosity is significant only with very intense heating. We also discuss possible markers of shocks in the observed spectra of Ca XIX (3.18 A) and Fe XXV (1.85 A) and show that viscosity influences time-integrated spectra and, a fortiori, spectra with one second-time resolution, as available with the Bragg Crystal Spectrometer on board YOHKOH.
Peres Giovanni
Reale Fabio
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