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Climatic Change

, Volume 2, Issue 1, pp 79–92 | Cite as

Variations in sunspot structure and climate

  • Douglas V. Hoyt
Article

Abstract

Sunspot structure is measured by taking the ratio of the area of the umbra to that of the penumbra. The time dependence of this umbral/penumbral ratio is remarkably similar to the record of the Northern Hemisphere surface temperature anomalies. On a year-to-year basis the correlation is 0.57, which is significant at better than the 0.01% level. It is postulated that a change in the umbral/penumbral ratio is proportional to a change in the solar luminosity and that long-term variations in the luminosity lead to corresponding changes in the climate of the Earth.

Keywords

Surface Temperature Time Dependence Northern Hemisphere Temperature Anomaly Hemisphere Surface 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© D. Reidel Publishing Company 1979

Authors and Affiliations

  • Douglas V. Hoyt
    • 1
  1. 1.National Oceanic and Atmospheric AdministrationBoulderUSA

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