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G.A. Chapman, S.R. Walton (San Fernando Observatory/CSUN), G. deToma, O.R. White (HAO/NCAR)
Sunspot areas from two photometric telescopes have been compared. The two telescopes are the Precision Solar Photometric Telescope (PSPT) operated on Mauna Loa by the High Altitude Observatory (HAO) and the Cartesian Full Disk Telescope 2 (CFDT2) operated at the San Fernando Observatory (SFO). The PSPT images originally 2048 x 2048 have been binned by two to agreee more closely with those from CFDT2. The binned PSPT pixels are 2" x 2" and the CFDT2 pixels are 2.5" x 2.5". A preliminary analysis shows that sunspot areas from the two are highly correlated although only seven image pairs have been correlated. Comparing the red PSPT spot areas with the red CFDT2 spot areas gives an r2 of 0.9947 and a scale factor of 0.909 ±0.03 where the scale factor implies the red areas are slightly too small. For CFDT2 blue images versus the red PSPT the r2 is 0.9895 with a scale factor of 1.06 ±0.05 implying that the blue areas are slightly too large. Results from other wavelengths and from an expanded data set will be presented and discussed. This research was partially supported by grants from NSF, NASA and a visiting scientist grant from HAO.
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