Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982a%26a...108...61m&link_type=abstract
Astronomy and Astrophysics, vol. 108, no. 1, Apr. 1982, p. 61-68. Research supported by the Observatoire de Meudon and Comision
Astronomy and Astrophysics
Astrophysics
20
Chromosphere, Extreme Ultraviolet Radiation, Solar Corona, Solar Flares, Solar X-Rays, Atmospheric Heating, Atmospheric Ionization, Carbon, Photoionization, Silicon
Scientific paper
X and UV radiation emitted from the flare corona and transition zone are shown to affect both the energy balance and ionization balance of chromosphere layers. The effect of X-rays is most important in producing temperature increases through the chromosphere, while it does not affect in a substantial way the overall ionization balance of abundant elements, with the exception of He I and, possibly, O I. UV lines radiation, on the other hand, produces strong variations in the ionization balance of some elements, in particular C I and Si I, and induce non LTE effects which modify the emergent spectra. Variations in the Si I continuum intensities at wavelengths under 1682 A are shown to be strongly decoupled from local variations in the Planck function, and cannot be used to derive temperature changes at the temperature minimum level.
Hénoux Jean-Claude
Machado Marcos E.
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