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J/ApJ/707/482 Models of the solar atmosphere. III. (Fontenla+, 2009)
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Beginning of ReadMe :J/ApJ/707/482 Models of the solar atmosphere. III. (Fontenla+, 2009)
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Semiempirical models of the solar atmosphere.
III. Set of non-LTE models for Far-Ultraviolet/Extreme-Ultraviolet irradiance
computation.
Fontenla J.M., Curdt W., Haberreiter M., Harder J., Tian H.
<Astrophys. J., 707, 482-502 (2009)>
=2009ApJ...707..482F
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ADC_Keywords: Sun ; Models, atmosphere ; Ultraviolet
Keywords: solar-terrestrial relations - Sun: activity - Sun: atmosphere -
Sun: chromosphere - Sun: faculae, plages - Sun: UV radiation
Abstract:
Semiempirical atmospheric models of solar surface features as observed
at moderate resolution are useful tools for understanding the observed
solar spectral irradiance variations. Paper I described a set of
models constructed to reproduce the observed radiance spectrum for
solar surface features at 2 arcsec resolution that constitute an
average over small-scale features such as granulation. Paper II showed
that a revision of previous models of low-chromospheric inter-network
regions explains the observed infrared CO lines in addition to the UV
and radio continuum from submillimeter to centimetric wavelengths. The
present paper (1) shows that the CaII H and K line wing observations
are also explained by the new quiet-Sun-composite model, (2)
introduces new low-chromospheric models of magnetic features that
follow the ideas in Paper II (Fontenla et al. 2007ApJ...667.1243F),
(3) introduces new upper chromospheric structures for all quiet-Sun
and active-region models, and (4) shows how the new set of models
explains EUV/FUV observations of spectral radiance and irradiance.
This paper also discusses the chromospheric radiative-loss estimates
in each of the magnetic features. The new set of models provides a
basis for the spectral irradiance synthesis at EUV/FUV wavelengths
based on the features observed on the solar surface.
Description:
Observations by the SOHO/SUMER instrument have been used to produce
the atlas of Curdt et al. (2001, Cat. J/A+A/375/591) showing the
spectrum of the average quiet-Sun in the wavelength range
700-1500AA. We use these observations for defining a set of
atmospheric models based on the distribution of observed intensities
at a few wavelengths.
The quiet-Sun components are defined from the CaII K line intensity
enhancements as described by Fontenla & Harder (2005MmSAI..76..826F).
Observations of the solar disk in the CaII K line from several
facilities are available. We currently use images obtained by the
Precision Solar Photometric Telescope instrument at the Mauna Loa
Solar Observatory (hereafter MLSO/PSPT). These data (see
http://lasp.colorado.edu/pspt_access/) provide an almost continuous
and accurate record since 2005 January and permit comparison of the
computed with observed spectral irradiance.