NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Solar rotation measurements at Mount Wilson. II - Systematic instrumental effects and the absolute rotation ratePossible sources of systematic error in solar Doppler rotational velocities are examined. Scattered light is shown to affect the Mount Wilson solar rotation results, but this effect is not enough to bring the spectroscopic results in coincidence with the sunspot rotation. Interference fringes at the spectrograph focus at Mount Wilson have in two intervals affected the rotation results. It has been possible to correlate this error with temperature and thus correct for it. A misalignment between the entrance and exit slits is a possible source of error, but for the Mount Wilson slit configuration, the amplitude of this effect is negligibly small. Rapid scanning of the solar image also produces no measurable effect.
Document ID
19810060831
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Labonte, B. J.
Howard, R.
(Mount Wilson and Las Campanas Observatories Pasadena, CA, United States)
Date Acquired
August 11, 2013
Publication Date
September 1, 1981
Publication Information
Publication: Solar Physics
Volume: 73
Subject Category
Instrumentation And Photography
Accession Number
81A45235
Funding Number(s)
CONTRACT_GRANT: NGR-09-140-015
CONTRACT_GRANT: NSF AST-77-24652
CONTRACT_GRANT: N00014-76-C-0113
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available