Skip to main content
eScholarship
Open Access Publications from the University of California

A Century of Solar Ca ii Measurements and Their Implication for Solar UV Driving of Climate

  • Author(s): Foukal, Peter
  • Bertello, Luca
  • Livingston, William C.
  • Pevtsov, Alexei A.
  • Singh, Jagdev
  • Tlatov, Andrey G.
  • Ulrich, Roger K.
  • et al.
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.

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Main Content
Current View