Abstract
We have processed a 10-year set of BBSO Ca II K-line filtergrams covering most of solar cycle 22. The excess K-line emission is integrated to form linear and square-root activity indices that are fitted to UV data from UARS and SME. Good fits are found both for the Mg II core-wing ratio (linear) and total Lα irradiance (square root) and the indices are thus good proxies for UV data. The SME Lα irradiance is systematically lower by 20% than predicted from our corresponding K-line indices. The 10.7 cm radio data confirms that SME underestimated the flux. The network is partly responsible for the solar cycle variation of the indices and is relatively more important in Lα than in Mg II and Ca II K. This is due to the saturation of Lα equivalent width. We also report on substantial improvements to the equipment and reduction software. The system is now based on a digital CCD camera which promises more accurate measurements in the upcoming solar cycle 23.
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.
Access this chapter
Tax calculation will be finalised at checkout
Purchases are for personal use only
Preview
Unable to display preview. Download preview PDF.
References
Bonnet, R. M., Bruner, E. C., Acton, L. W., Brown, W. A., and Decaudin, ML: 1980, Astrophys. J. 237
Harvey, K. L. and White, O. R.: 1996, presented at SOLERS22.
Johannesson, A., Marquette, W. H., and Zirin, H.: 1995, Solar Phys. 161, 121.
Kankelborg, C. C., Walker, A. B. C., Hoover, R. B., and Barbee, T. W.: 1996, Astrophys. J. 466, 529.
Kariyappa, R.: 1996, presented at SOLERS22.
Kuhn, J. R., Lin, H., and Loranz, D.: 1991, Publ. Astron. Soc. Pacific 103, 1097.
Lean, J. L.: 1991, Rev. Geophys. 29, 505.
Lean, J. L., Livingston, W. C., Heath, D. F., Donnelly, R. R., Skumanich, A., and White, O. R.: 1982, J. Geophys. Res. 87, 10307.
Lean, J. L., Cook, J., Marquette, W., Johannesson, A., and Willson, R. C.: 1997, Astrophysical J., submitted.
Marquette, W. H.: 1992, Proceedings of the Workshop on the Solar Electromagnetic Radiation Study for Solar Cycle 22.
Pap, J. M., London, J., and Rottman, G. J.: 1991, Astron. Astrophys. 245, 648.
Pap, J. M., Marquette, W. H., and Donnelly, R. F.: 1991, Adv. Space Res. 8, 271.
Turmon, M. J. and Pap, J. M.: 1996, presented at SOLERS22.
Warren, H. P., Mariska, J. T., Lean, J., Marquette, W., and Johannesson, A.: 1996, Geophys. Res. Letters 23, 17.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1998 Springer Science+Business Media Dordrecht
About this paper
Cite this paper
Johannesson, A., Marquette, W.H., Zirin, H. (1998). A 10-Year Set of Ca II K-Line Filtergrams. 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_22
Download citation
DOI: https://doi.org/10.1007/978-94-011-5000-2_22
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-6099-8
Online ISBN: 978-94-011-5000-2
eBook Packages: Springer Book Archive