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On the apparent velocity of integrated sunlight. I - 1983-1985Frequency measurements for the Delta V = 2 transitions of CO in the integrated light spectrum of the sun are presented. The nature and magnitude of systematic errors which typically arise in absolute velocity measurements of integrated sunlight are explored in some detail, and measurements believed accurate at the level of about 5 m/s or less are presented. It is found that the integrated light velocity varies by about 3 m/s or less over a one-day period. Over the long term, the data indicate an increasing blue-shift in these weak infrared lines amounting to 30 m/s from 1983 to 1985. The sense of the drift is consistent with a lessening in the magnetic inhibition of granular convection at solar minimum. Such an effect has implications for the spectroscopic detectability of planetary-mass companions to solar-type stars.
Document ID
19870053402
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Deming, Drake
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Espenak, Fred
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Jennings, Donald E.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Brault, James W.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wagner, Jeremy
(National Solar Observatory Tucson, AZ, United States)
Date Acquired
August 13, 2013
Publication Date
May 15, 1987
Publication Information
Publication: Astrophysical Journal, Part 1
Volume: 316
ISSN: 0004-637X
Subject Category
Solar Physics
Accession Number
87A40676
Distribution Limits
Public
Copyright
Other

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