Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...491..952k&link_type=abstract
Astrophysical Journal v.491, p.952
Astronomy and Astrophysics
Astronomy
20
Sun: Corona, Sun: Transition Region, Sun: Magnetic Fields, Sun: Uv Radiation, Sun: X-Rays, Gamma Rays
Scientific paper
The Multispectral Solar Telescope Array was launched on 1991 May 13, in order to obtain narrowband images of the solar corona and transition region. Calibrated EUV and H Lyman- alpha images are used to constrain a simple loop model of the energy balance in 23 X-ray bright points (XBPs). The results are consistent with substantial back heating of the lower transition region by thermal conduction from the corona. Statistical analysis shows that length and temperature are uncorrelated for XBP loops; implications of this finding for coronal heating are discussed. Some evidence is found for a systematic imbalance between radiative and conductive losses. Inferences of effective loop cross section by modeling suggest that the coronal filling factor is nearly unity.
Hoover Richard B.
Kankelborg Charles C.
Walker Arthur B. C. II
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