A Century of Solar Ca ii Measurements and Their Implication for Solar UV Driving of Climate |
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| Authors: | Peter Foukal Luca Bertello William C. Livingston Alexei A. Pevtsov Jagdev Singh Andrey G. Tlatov Roger K. Ulrich |
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| Affiliation: | (1) Heliophysics, Inc., 192 Willow Road, Nahant, MA 01908, USA;(2) Department of Physics and Astronomy, University of California at Los Angeles, Los Angeles, CA 90095-1547, USA;(3) National Solar Observatory, Tucson, AZ 85726, USA;(4) National Solar Observatory, Sunspot, NM 88349, USA;(5) Indian Institute of Astrophysics, Koramangala, Bangalore, India;(6) Kislovodsk Solar Station of Pulkovo Observatory, Kislovodsk, Russia |
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| Abstract: | Spectroheliograms and disk-integrated flux monitoring in the strong resonance line of Ca ii (K line) provide the longest record of chromospheric magnetic plages. We compare recent reductions of the Ca ii K spectroheliograms obtained since 1907 at the Kodaikanal, Mt. Wilson, and US National Solar Observatories. Certain differences between the individual plage indices appear to be caused mainly by differences in the spectral passbands used. Our main finding is that the indices show remarkably consistent behavior on the multidecadal time scales of greatest interest to global warming studies. The reconstruction of solar ultraviolet flux variation from these indices differs significantly from the 20th-century global temperature record. This difference is consistent with other findings that, although solar UV irradiance variation may affect climate through influence on precipitation and storm tracks, its significance in global temperature remains elusive. |
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| Keywords: | Solar activity Magnetic plages Solar ultraviolet irradiance Sun – climate effects |
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