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Thermal bifurcation in the upper photosphere inferred from heterodyne spectroscopy of OH rotational linesLow-noise (S/N greater than 100), high spectral resolution observations of two pure rotation transitions of OH from the solar photosphere are used to make inferences concerning the thermal structure and inhomogeneity of the upper photosphere. It is found that the v = O R22(24.5)e line strengthens at the solar limb, in contradiction to the predictions of current one-dimensional photospheric models. The results for this line support a two-dimensional model in which horizontal thermal fluctuations in the upper photosphere are of the order plus or minus 800 K. This thermal bifurcation may be maintained by the presence of magnetic flux tubes and may be related to the solar limb extensions observed in the 30-200-micron region.
Document ID
19850038129
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Deming, D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kostiuk, T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mumma, M. J. (NASA Goddard Space Flight Center Laboratory for Extraterrestrial Physics, Greenbelt, MD; Kitt Peak National Observatory, Tucson, AZ, United States)
Hillman, J. J. (NASA Goddard Space Flight Center Laboratory for Extraterrestrial Physics, Greenbelt, MD, United States)
Zipoy, D. M. (Kitt Peak National Observatory, Tucson, AZ; Maryland, University College Park, MD, United States)
Date Acquired
August 12, 2013
Publication Date
August 1, 1984
Publication Information
Publication: Solar Physics
Volume: 94
ISSN: 0038-0938
Subject Category
SOLAR PHYSICS
Distribution Limits
Public
Copyright
Other