[38.01] High-Resolution Imaging of the Solar Photosphere Using Simultaneous G-Band and Continuum Observations

AAS 200th meeting, Albuquerque, NM, June 2002
Session 38. Solar Photosphere, Chromosphere and Transition Region
Display, Tuesday, June 4, 2002, 10:00am-6:30pm, SW Exhibit Hall

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[38.01] High-Resolution Imaging of the Solar Photosphere Using Simultaneous G-Band and Continuum Observations

A. A. van Ballegooijen, P. Nisenson (Harvard-Smithsonian Center for Astrophysics)

Imaging of the Sun with ground-based telescopes requires accurate correction for the effects of turbulence in the Earth's atmosphere (``seeing"). An observed solar image is a convolution of a true solar image with a point spread function (PSF) describing the seeing effects. We present a new method for image reconstruction that uses pairs of images taken at two nearby wavelengths (G-band, 430.5 nm, and nearby continuum, 450.8 nm). Each image pair is taken strictly simultaneously, so that the two images are affected by the same PSF. A burst of 21 such image pairs is taken within a few seconds; the sun does not change much during this time, but the seeing varies randomly from one pair to the next. We determine the true solar images (and 21 PSFs) by iterative deconvolution. The method is applied to measurements obtained at the Dunn Solar Telescope (NSO/Sacramento Peak) on November 2, 2001. Preliminary results from the analysis of these data are presented.

This work is supported by a grant from the National Science Foundation.

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