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Solar calibration of stellar rotation tracersA study of the time variability of the disk-integrated solar magnetic flux, with a view to the behavior of emission-line intensity variations observed in lower main sequence stars, has determined that solar rotation modulation of the integrated flux is present in 75% of all rotations. For observing intervals of more than twice the lifetime of the features causing rotational modulation, the correct rotation period is identified in more than 90% of all cases. The optimum time for measuring rotational modulation is the decay phase of the activity cycle, and the solar rotation period is measured with an accuracy of a few percent. The lifetime of a rotational modulation period is approximately five rotations, and a sensitivity limit of Delta S= 0.005 is found for the Vaughan et al (1981) stellar rotation measures.
Document ID
19820061068
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Labonte, B. J.
(Hawaii, University Honolulu, HI, United States)
Date Acquired
August 10, 2013
Publication Date
September 15, 1982
Publication Information
Publication: Astrophysical Journal
Subject Category
Astronomy
Accession Number
82A44603
Funding Number(s)
CONTRACT_GRANT: NGL-12-001-011
Distribution Limits
Public
Copyright
Other

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