Imaging coronal emission lines under high sky-background conditions |
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Authors: | C U Keller R N Smartt |
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Institution: | (1) National Solar Observatory, National Optical Astronomy Observatories, P.O.box 26732, 85726-6732 Tucson, AZ, U.S.A.;(2) National Solar Observatory, National Optical Astronomy Observatories, P.O.Box 62, 88349-0062 Sunspot, NM, USA |
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Abstract: | We have obtained images in solar coronal emission lines under high sky-background conditions by making precise differential measurements between the coronal emission line and the near-by continuum, which is primarily due to scattered light from the solar disk. Chopping between the two wavelengths was performed at 100 kHz to avoid artifacts from fast-flying dust particles and other aerosols, and also from seeing effects. The differential signal was detected with a novel CCD camera that demodulates signals up to 100 kHz. These preliminary observations show coronal emission at the 0.2% level of the scattered-light background and pave the way to efficient and precise imaging of coronal emission features under less than ideal coronal-sky conditions.Operated by the Association of Universities for Research in Astronomy, Inc. (AURA) under cooperative agreement with the National Science Foundation. |
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