Physics
Scientific paper
Oct 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991soph..135..211u&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 135, Oct. 1991, p. 211-241.
Physics
17
Line Spectra, Solar Instruments, Solar Spectra, Spectrographs, Software Tools, Spectrum Analysis, Sunlight
Scientific paper
Enhancements to the hardware and software are described for the 150-foot tower system on Mt. Wilson which make possible the acquisition of high-precision line-profile measurements. This system utilizes the 75-foot pit spectrograph with a photomultiplier detector system to scan line profiles repeatedly in order to study variations induced by the passage of waves vertically through the solar atmosphere. Oscillations of line-profile parameters with an amplitude as low as 1.7 m/s are detected with this system using integrated sunlight. Phase relations between oscillations of different parts of the line profile are appropriate to upward energy transport. Consistent with the previous conclusion by Mein and Schmieder (1981), the magnitude of the energy transport is compatible with the 5-min oscillations making an important contribution to the heating of the low chromosphere.
Bogart Richard. S.
Boyden John E.
Magnone Nick
Ulrich Roger K.
Webster Larry
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