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Title: Solar Records: The Wolf Sunspot Index and Umbral/Penumbral Ratio

Abstract

These data from observations of sunspot activity cover the period 1875 through 1981; reconstructions are possible back to 1832. Available sunspot models and the theory of mixing length indicate that the observed changes in the umbral/penumbral (U/P) ratio may be equivalent to changes in the solar constant. The U/P ratio is calculated from measurements of solar activity and has been shown to be in good agreement with the Northern Hemisphere temperature record. The data consist of year, number of sunspot groups, Wolf sunspot number, umbra area, whole area, penumbral area, and umbral/penumbral ratio. The data are in one file (3.3 kB).

Authors:

  1. National Center for Atmospheric Research, Boulder, CO (United States)
Publication Date:
Other Number(s):
NDP-014
Product Type:
Dataset
Research Org.:
Environmental System Science Data Infrastructure for a Virtual Ecosystem (ESS-DIVE) (United States); Carbon Dioxide Information Analysis Center (CDIAC), Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (USA)
Sponsoring Org.:
USDOE Office of Science (SC)
Subject:
54 ENVIRONMENTAL SCIENCES
OSTI Identifier:
1389514
DOI:
https://doi.org/10.3334/CDIAC/SAR.NDP014

Citation Formats

Hoyt, Douglas V. Solar Records: The Wolf Sunspot Index and Umbral/Penumbral Ratio. United States: N. p., 1985. Web. doi:10.3334/CDIAC/SAR.NDP014.
Hoyt, Douglas V. Solar Records: The Wolf Sunspot Index and Umbral/Penumbral Ratio. United States. doi:https://doi.org/10.3334/CDIAC/SAR.NDP014
Hoyt, Douglas V. 1985. "Solar Records: The Wolf Sunspot Index and Umbral/Penumbral Ratio". United States. doi:https://doi.org/10.3334/CDIAC/SAR.NDP014. https://www.osti.gov/servlets/purl/1389514. Pub date:Tue Jan 01 00:00:00 EST 1985
@article{osti_1389514,
title = {Solar Records: The Wolf Sunspot Index and Umbral/Penumbral Ratio},
author = {Hoyt, Douglas V.},
abstractNote = {These data from observations of sunspot activity cover the period 1875 through 1981; reconstructions are possible back to 1832. Available sunspot models and the theory of mixing length indicate that the observed changes in the umbral/penumbral (U/P) ratio may be equivalent to changes in the solar constant. The U/P ratio is calculated from measurements of solar activity and has been shown to be in good agreement with the Northern Hemisphere temperature record. The data consist of year, number of sunspot groups, Wolf sunspot number, umbra area, whole area, penumbral area, and umbral/penumbral ratio. The data are in one file (3.3 kB).},
doi = {10.3334/CDIAC/SAR.NDP014},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}