A Search For Variations in the Solar Radius

Details A Search For Variations in the Solar Radius A Search For Variations in the Solar Radius

May 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.9302c&link_type=abstract

American Astronomical Society, 194th AAS Meeting, #93.02; Bulletin of the American Astronomical Society, Vol. 31, p.988

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on an ongoing analysis of the radius of solar images from two photometric telescopes at the San Fernando Observatory. Data used from CFDT1 with 5 arc-sec pixels begins in 1986. Data used from CFDT2 with 2.5 arc-sec pixels begins in the summer of 1992. The solar diameter is determined along the length of the linear diode array in the geocentric north-south direction by fitting the entire image as described in Walton, et al. (1998). Previously, we reported a solar radius variation in phase with the solar cycle using data from CFDT1. A reanalysis of those data have resulted in a much smaller radius variation than that reported in Chapman, et al. (1998). We will report on efforts to compare the radius found from CFDT1 images with that from CFDT2 images. The two instruments have undergone improvements but each at different times. We will discuss possible radius variations between the two instruments. This work was supported by NSF grant ATM-9504374 and NASA grant NAG5-4973. References Chapman, G.A., Cookson, S.R., Dobias,J.J. and Walton, S.R. 1998, Spring AGU Meeting. Walton, S.R., Chapman, G.A., Cookson, A.M., Dobias, J.J. and Preminger, D.G. 1998, Solar Phys. 179, 31.

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