Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apj...614.1022p&link_type=abstract
The Astrophysical Journal, Volume 614, Issue 2, pp. 1022-1027.
Astronomy and Astrophysics
Astronomy
9
Hydrodynamics, Sun: Corona, Sun: Flares, Sun: Uv Radiation
Scientific paper
EUV observations often indicate the presence of bright knots in flare loops. The temperature of the knot plasma is of the order of 1 MK, and the knots themselves are usually localized somewhere near the loop tops. We propose a model in which the formation of EUV knots is due to the spatial structure of the nonflare active region heating. We present the results of a series of one-dimensional hydrodynamic, flare-loop simulations, which include both an impulsive flare heating and a background, active region heating. The simulations demonstrate that the formation of the observed knots depends critically on the spatial distribution of the background heating during the decay phase. In particular, the heating must be localized far from the loop apex and have a magnitude comparable to the local radiative losses of the cooling loop. Our results, therefore, provide strong constraints on both coronal heating and postflare conditions.
Antiochos Spiro K.
Klimchuk James A.
Patsourakos Spiros
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