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Title:
Rotation of the sun measured from Mount Wilson white-light images
Authors:
Howard, R.; Gilman, P. I.; Gilman, P. A.
Affiliation:
AA(Mount Wilson and Las Campanas Observatoires, Pasadena, CA), AB(Mount Wilson and Las Campanas Observatoires, Pasadena, CA), AC(High Altitude Observatory, Boulder, CO)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 283, Aug. 1, 1984, p. 373-384. (ApJ Homepage)
Publication Date:
08/1984
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Astronomical Photography, Solar Rotation, Sunspots, Angular Velocity, Annual Variations, Data Reduction
DOI:
10.1086/162315
Bibliographic Code:
1984ApJ...283..373H

Abstract

The instrumentation, data and data reduction procedures used in white light observations of sunspot rotation rates are described. The study covered 62 yr of rotation observations. The data were all gathered using the same Mt. Wilson telescope, which has had three different main lenses in the interval 1981-82. Details of the exposure calibration and lens operation procedures are provided. The data were treated in terms of eight evenly space determinations of the solar limb and account was taken of all sunspots within 60 deg of the central meridian. Spot movements were traced in terms of groups of contiguous individual spots. Large spots rotated slower than small spots, a condition attributed to greater viscous drag in the larger flux tubes in the photosphere. The data tend to confirm theories that the photospheric gas revolves at a different rate than the sunspots.

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