Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...269..309g&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 269, June 1, 1983, p. 309-318.
Astronomy and Astrophysics
Astrophysics
10
Infrared Absorption, Magnetohydrodynamic Turbulence, Molecular Absorption, Solar Spectra, Solar Temperature, Sunspots, Abundance, Atmospheric Pressure, Laser Spectroscopy, Optical Heterodyning, Silicon Oxides, Solar Atmosphere, Spectral Line Width, Stellar Models, Umbras
Scientific paper
Absorption features from the 8 micron SiO fundamental (upsilon = 1-0) and hot bands (upsilon = 2-1) have been observed in sunspots at sub-Doppler resolution using a ground-based tunable diode laser heterodyne spectrometer. The observed line widths suggest an upper limit of 0.5 km/s for the microturbulent velocity in sunspot umbrae. Since the silicon monoxide abundance is very sensitive to sunspot temperature, the measured equivalent widths permit an unambiguous determination of the temperature-pressure relation in the upper layers of the umbral atmosphere. In the region of SiO line formation (log Pg = 3.0-4.5), the results support the sunspot model suggested by Stellmacher and Wiehr (1970).
Deming Drake
Glenar David A.
Jennings Donald E.
Kostiuk Theodor,
Mumma Michael J.
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