Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...314..643d&link_type=abstract
Astronomy and Astrophysics, v.314, p.643-649
Astronomy and Astrophysics
Astrophysics
10
Radiative Transfer, Sun: Flares
Scientific paper
In this paper, we study the effect of different flare-associated disturbances on the white-light continuum emission, using a non-LTE computation code. A systematic study is made to show the variational behavior of the continuum contrast in dependence on different input parameters and different locations on the Sun. The results show that (1) a purely chromospheric temperature rise is not sufficient, under the assumed physical conditions, to produce a significant continuum enhancement, especially at visible wavelengths, except for some extreme cases when the chromospheric temperature is rather high and the event occurs near the disk limb, (2) a downward shift of the transition region would have some effect, if the top column mass density becomes sufficiently large, and (3) the effect of nonthermal electron beam bombardment is obvious only when the transition region has not suffered a great shift. For these three cases, the continuum contrast in the Balmer continuum is much larger than that beyond the Balmer continuum, implying there is a Balmer jump in the modeled spectra. In some special cases, the chromospheric temperature rise enhances the absorption of the photospheric radiation, thus producing a spurious negative continuum contrast. A case for possible temperature rises around the temperature minimum region is also considered. The continuum contrast in the case of enhanced temperature minimum is found to be much flatter than for the above cases, implying a significant emission process in the lower atmosphere.
Ding Ming-De Ding
Fang Chen
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