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Metadata Identifier: gov.noaa.ngdc.stp.solar:G00532
MD_DataIdentification
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Sunspot Numbers |
In 1848 the Swiss astronomer Johann Rudolph Wolf introduced a daily measurement
of sunspot number. His method, which is still used today, counts the total number
of spots visible on the face of the sun and the number of groups into which they cluster,
because neither quantity alone satisfactorily measures sunpsot activity.An observer
computes a daily sunspot number by multiplying the number of groups he sees by ten
and then adding this product to his total count of individual spots. Results, however,
vary greatly, since the measurement stongly depends on observer interpretation and
experience and on the stability of the Earth's atmosphere above the observing site.
Moreover, the use of Earth as a platform from which to record these numbers contributes
to their variability, too, because the sun rotates and the evolving spot groups are
distributed unevenly across solar longitudes. To compensate for these limitations,
each daily international number is computed as a weighted average of measurements
made from a network of cooperating observatories.
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SV_Identification
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NASA/GCMD Data Center Keywords |
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NASA/GCMD Location Keywords |
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GCMD Science Keywords |
NASA/Global Change Master Directory (GCMD) Earth Science Keywords |
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Sunspot Numbers |
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SUNSPOTS |
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Uncontrolled Location Keywords |
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DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
of Commerce (comp).
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publisher |
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NASA/GSFC/SED/ESD/GCDC/GCMD > Global Change Master Directory, Global Change Data Center,
Earth Sciences Division, Science and Exploration Directorate, Goddard Space
Flight Center, NASA
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resourceProvider |
http://gcmd.gsfc.nasa.gov/Resources/valids/archives/keyword_list.html |
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Solar Data Manager |
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
of Commerce
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solar.ngdc@noaa.gov |
pointOfContact |
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Solar Data Manager |
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
of Commerce
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solar.ngdc@noaa.gov |
distributor |
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Solar Data Manager |
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department
of Commerce
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solar.ngdc@noaa.gov |
custodian |
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ftp://ftp.ngdc.noaa.gov/STP/SOLAR_DATA/SUNSPOT_NUMBERS |
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http://gcmd.gsfc.nasa.gov/Resources/valids/archives/keyword_list.html |
GCMD Keywords, Version 6.0.0.0.0 |
Thesuarus for earth science keywords and associated directories hosted and maintained
by NASA.
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information |
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http://www.ngdc.noaa.gov/stp/SOLAR/SSN/ssn.html |
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http://www.ngdc.noaa.gov/stp/SOLAR/ftpsunspotnumber.html |
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Bounding Box |
Temporal Extent |
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1700-01-01 |
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