Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...618l.157w&link_type=abstract
The Astrophysical Journal, Volume 618, Issue 2, pp. L157-L160.
Astronomy and Astrophysics
Astronomy
30
Sun: Corona, Sun: Flares
Scientific paper
Chromospheric evaporation is a central element of current models of solar flares. The high-velocity upflows that should accompany evaporation, however, are rarely observed in high-resolution solar flare spectra. Thus the absence of blueshifted line profiles represents a significant discrepancy between the theory and observations of this phenomenon. In this Letter we present an algorithm for computing multiple-loop time-dependent hydrodynamic simulations of solar flares using a minimum of assumptions. We show that these simulations can accurately reproduce the Ca XIX and S XV line profiles observed with the Bragg Crystal Spectrometer on Yohkoh during the earliest stages of a flare. Since our model represents the flare as a succession of independently heated threads, the strongly blueshifted emission evident during the initial heating of a thread is largely masked by emission from threads that have been heated previously and do not show bulk motions.
Doschek George A.
Warren Harry P.
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