Abstract
We present a method for the determination of the center-to-limb variation (CLV) for Ca II K spectroheliograms. It is based on the calculation of intensity histograms for rings of constant area. Using a simple cutoff criterion in the cumulative histograms, we are able to derive CLVs of the quiet Sun regardless of the solar activity level. Using an example from the literature, we show in which way different methods of normalization of the quiet-Sun CLV may affect the results.
Paper presented at the SOLERS22 International Workshop, held at the National Solar Observatory, Sacramento Peak, Sunspot, New Mexico, U.S.A., June 17–21, 1996.
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© 1998 Springer Science+Business Media Dordrecht
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Brandt, P.N., Steinegger, M. (1998). On the Determination of the Quiet-Sun Center-To-Limb Variation in Ca II K Spectroheliograms. In: Pap, J.M., Fröhlich, C., Ulrich, R.K. (eds) Solar Electromagnetic Radiation Study for Solar Cycle 22. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5000-2_24
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DOI: https://doi.org/10.1007/978-94-011-5000-2_24
Publisher Name: Springer, Dordrecht
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