34th Solar Physics Division Meeting, June 2003
Session 7 Photosphere and Chromosphere I
Poster, Monday, June 16, 2003, 3:30-5:00pm, Mezzanine

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[7.07] A Comparison of Summed Continuum and CaII K-line Images

G.A. Chapman, A.M. Cookson, S.R. Walton (San Fernando Observatory/CSUN), C. Smith (Dept. of Physics & Astronomy/CSUN)

Full-disk photometric images are obtained with two telescopes on a daily basis at the following wavelengths: 393 nm (CaII K-line), 472 nm and 672 nm. In order to explore the characteristics of the fainter facular/network elements, we obtain, on occasion, up to 10 images as closely spaced in time as possible. For the work reported on here, we have used red continuum images at 672 nm (bandpass 10 nm) from the CFDT2 telescope (pixel size 2.5" x 2.5"). These images have been coaligned and summed to reduce noise from non-magnetic intensity features. The customary image processing tools have been applied (Walton et al. 1998). The quiet sun rms intensity fluctuation drops from about 0.58 % on a single image to about 0.21 % on the summed image. On the summed red image, bright facular/network features as faint as about 0.6 % become visible across the solar disk. These features will be compared with those found on images obtained in the CaII K-line to determine their reality in terms of K-line faculae.

This work has been partially supported by grants from NASA (NAG5-7191) and NSF (ATM-9912132).

Reference Walton, S.R., Chapman, G.A., Cookson, A.M., Dobias, J.J. and Preminger, D.G. 1998, Solar Phys. 179, 31-42.


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