Sunspot Deficits Measured With a New, 3-inch Full Disk Photometric Telescope

Details Sunspot Deficits Measured With a New, 3-inch Full Disk Photometric Telescope Sunspot Deficits Measured With a New, 3-inch Full Disk Photometric Telescope

May 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...180.1706c&link_type=abstract

American Astronomical Society, 180th AAS Meeting, #17.06; Bulletin of the American Astronomical Society, Vol. 24, p.754

Astronomy and Astrophysics

Astronomy

1

Scientific paper

A new photometric telescope has begun operation which is similar to the old CFDT (Cartesian Full Disk Telescope). The new one has a 3-inch aperture objective and a 1024 element linear diode array. Each pixel corresponds to 2.5 arc-sec on the sky. As with the old CFDT (Chapman, et al./ 1989, Ap. J. 343, 547) this telescope uses the earth's diurnal motion to scan the array and build up a 1024 x 1024 pixel image of the solar disk and nearby sky. Results will be presented here comparing sunspot areas and deficits as measured with the new and old CFDT. Analysis of images obtained under conditions of poor seeing on 24 December 1991 show that the new CFDT gives sunspot areas and deficits that are 1.36 and 1.16 times greater, respectively, than those from the old CFDT. This research has been partially supported by NSF Grant ATM-8817634 and NASA Grant NAG-5-1219.

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