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

Dataset · Mon Jan 01 04:00:00 EST 2018

DOI:https://doi.org/10.3334/CDIAC/SAR.NDP014· OSTI ID:1389514

Hoyt, D. V. ^[1]

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1. National Center for Atmospheric Research (NCAR), Atmospheric Chemistry Division; OSTI

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

• Research Organization: Environmental System Science Data Infrastructure for a Virtual Ecosystem
• Sponsoring Organization: U.S. DOE > Office of Energy Research (ER)
• OSTI ID: 1389514
• Report Number(s): osti:1389514; doi:10.3334/CDIAC/SAR.NDP014; cdiac:doi 10.3334/CDIAC/sar.ndp014
• Country of Publication: United States
• Language: English

Related Subjects

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