Physics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984soph...94...57d&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 94, Aug. 1984, p. 57-74.
Physics
18
Hydroxyl Radicals, Photosphere, Solar Spectra, Thermodynamic Equilibrium, Limb Darkening, Line Spectra, Molecular Rotation, Optical Heterodyning, Radiative Transfer, Two Dimensional Models
Scientific paper
The authors have obtained low noise (S/N > 103), high spectral resolution (ν/Δν ≈ 106) observations of two pure rotation transitions of OH from the solar photosphere. The observations were obtained using the technique of optically null-balanced infrared heterodyne spectroscopy, and consist of center-to-limb line profiles of a υ = 1 and a υ = 0 transition near 12 μm. These lines should be formed in local thermodynamic equilibrium, and are diagnostics of the thermal structure of the upper photosphere. The data support a two-dimensional model in which horizontal thermal fluctuations of order ±800K occur in the region τ5000 ≈ 10-3 - 10-2. 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 μm region.
Deming Drake
Hillman John J.
Kostiuk Theodor,
Mumma Michael J.
Zipoy David M.
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