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

Hoyt, D. V.

doi:10.3334/CDIAC/SAR.NDP014

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

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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).For access to the data files, click this link to the CDIAC data transition website: http://cdiac.ess-dive.lbl.gov/ndps/ndp014.html

Authors:

Hoyt, D. V.

National Center for Atmospheric Research (NCAR), Atmospheric Chemistry Division

Publication Date:: 2018-01-01

Other Number(s):: osti:1389514; doi:10.3334/CDIAC/SAR.NDP014; cdiac:doi 10.3334/CDIAC/sar.ndp014

Research Org.:: Environmental System Science Data Infrastructure for a Virtual Ecosystem (ESS-DIVE) (United States)

Sponsoring Org.:: U.S. DOE > Office of Energy Research (ER)

Subject:: 54 ENVIRONMENTAL SCIENCES

Keywords:: Wolf Sunspot Number; Penumbral Area; Sunspot Groups; Sunspots; Solar Activity; Solar Constant; Umbra Area; Umbral/Penumbral Ratio; Whole Area; Convection; Climate Change; Hoyt; NCAR; Atmospheric Chemistry Division ; NDP-014; GROUP(I); UMBRA(I); WHOLE(I); WOLF(I); YEAR(I)

OSTI Identifier:: 1389514

DOI:: https://doi.org/10.3334/CDIAC/SAR.NDP014

Citation Formats


                    Hoyt, D. V. Solar Records: The Wolf Sunspot Index and Umbral/Penumbral Ratio.  United States: N. p., 2018. 
        Web.  doi:10.3334/CDIAC/SAR.NDP014.

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                    Hoyt, D. V. Solar Records: The Wolf Sunspot Index and Umbral/Penumbral Ratio.  United States.  doi:https://doi.org/10.3334/CDIAC/SAR.NDP014

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                    Hoyt, D. V. 2018.  
"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:Mon Jan 01 00:00:00 EST 2018

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@article{osti_1389514,

  title        = {Solar Records: The Wolf Sunspot Index and Umbral/Penumbral Ratio},

  author       = {Hoyt, D. 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).For access to the data files, click this link to the CDIAC data transition website: http://cdiac.ess-dive.lbl.gov/ndps/ndp014.html},

  doi          = {10.3334/CDIAC/SAR.NDP014},

  journal      = {},

  number       = ,

  volume       = ,

  place        = {United States},

  year         = {2018},

  month        = {1}

}

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DOI: https://doi.org/10.3334/CDIAC/SAR.NDP014

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