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

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]
  1. National Center for Atmospheric Research, Boulder, CO (United States)
Publication Date:
Report Number(s):
NDP-014
Product Type:
Dataset
Research Org(s):
Environmental System Science Data Infrastructure for a Virtual Ecosystem; 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

Hoyt, Douglas V. Solar Records: The Wolf Sunspot Index and Umbral/Penumbral Ratio. United States: N. p., Web. doi:10.3334/CDIAC/SAR.NDP014.
Hoyt, Douglas V. Solar Records: The Wolf Sunspot Index and Umbral/Penumbral Ratio. United States. doi:10.3334/CDIAC/SAR.NDP014.
Hoyt, Douglas V. 1985. "Solar Records: The Wolf Sunspot Index and Umbral/Penumbral Ratio". United States. doi:10.3334/CDIAC/SAR.NDP014. https://www.osti.gov/servlets/purl/1389514.
@misc{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},
year = {1985},
month = {1} }
  1. The U.S. Department of Energy’s (DOE) Environmental Systems Science Data Infrastructure for a Virtual Ecosystem (ESS-DIVE) is a data archive for Earth and environmental science data. The mission of ESS-DIVE is to preserve, expand access to, and improve usability of critical data generated through DOE-sponsored research of terrestrial and subsurface ecosystems. By making ESS research data easily accessible, ESS-DIVE has the potential to advance the scientific understanding and prediction of hydro-biogeochemical and ecosystem processes that occur from bedrock through soil and vegetation to the atmospheric interface.
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