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Photospheric Faculae and the Solar Oblateness: a Reply to "faculae and the Solar Oblateness" by R. H. Dicke

Chapman, Gary A. and Ingersoll, Andrew P. (1973) Photospheric Faculae and the Solar Oblateness: a Reply to "faculae and the Solar Oblateness" by R. H. Dicke. Astrophysical Journal, 183 . pp. 1005-1023. ISSN 0004-637X. doi:10.1086/152287.

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Dicke has recently contested our statement in an earlier paper that faculae could account for a large part, if not all, of the solar oblateness signal measured by Dicke and Goldenberg in 1966. Using the facular oblateness signal published in our earlier paper and some hitherto unpublished data from his 1966 observations, he concludes that faculae account for only a small part (11 percent) of the observed excess oblateness. His analysis considers data only from a restricted 48-day sample and is based on the assumption that only the observed oblateness signal is subject to error. Our analysis considers data from all 64 days on which observations were made, and is based on the assumption that both the observed oblateness signal and the facular signal are subject to error. We find that faculae account for at least one-third to one-half of the observed excess oblateness, depending on whether 48 days or 64 days are used in the analysis. Moreover, faculae may account for all of the observed excess oblateness provided the facular error is sufficiently large. Thus faculae cannot be excluded as the major source of Dicke and Goldenberg's 1966 oblateness signal.

Item Type:Article
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Ingersoll, Andrew P.0000-0002-2035-9198
Additional Information:© 1973 American Astronomical Society. Received 1972 July 19; revised 1973 February 14. We appreciate helpful criticisms of the first draft of this paper by an unknown referee. We gratefully acknowledge support of this research by company funds of The Aerospace Corporation and by the National Aeronautics and Space Administration under grant NGL 05-002-003 awarded to the California Institute of Technology. We thank Dr. Eldon L. Haines for bringing to our attention the paper by Chandler (1972). We also thank Dr. Dicke for sending some of his data to us (Dicke 1972b).
Group:UNSPECIFIED, Division of Geological and Planetary Sciences
Funding AgencyGrant Number
Aerospace CorporationUNSPECIFIED
Subject Keywords:faculae, solar; rotation, solar; gravitation
Record Number:CaltechAUTHORS:20131127-085027418
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Official Citation:Photospheric Faculae and the Solar Oblateness: a Reply to "faculae and the Solar Oblateness" by R. H. Dicke Chapman, Gary A.; Ingersoll, Andrew P. Astrophysical Journal, Vol. 183, pp. 1005-1024 (1973) (ApJ Homepage) Publication Date: 08/1973
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:42749
Deposited By: Ruth Sustaita
Deposited On:27 Nov 2013 17:56
Last Modified:10 Nov 2021 16:27

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