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Metadata Identifier: gov.noaa.ngdc.stp.solar:G00533
MD_DataIdentification
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Solar Magnetic Field |
The solar magnetic field is approximately a dipole at high latitudes and is
highly irregular at middle and low latitudes. The field apparently gives rise to a
coupling between solar differential rotation and the 11-year cycle of solar activity;
the field also governs the evolution of individual active regions. Field magnitudes
range from a few gauss in quiet regions to a few thousand gauss in some active regions.
Longitudinal (line-of-sight) components of the solar magnetic field are measured by
magnetographs which use the Zeeman effect. The solar magnetic fields are photographically
or computer drawn contours of the solar longitudinal magnetic field distribution across
the whole sun at different levels of nanotesla (gauss). The computer plotted contours
use solid lines for positive and dotted lines for negative field polarities. The polarities
on the photographs are indicated by bright areas as positive and dark areas as negative.
The data also can be drawings of individual sunspot regions with coordinates, polarity
and intensity in nanotesla of each spot indicated. The National Geophysical Data Center
(NGDC) archives (from about 14 stations): 1) once-daily (Scout) measurements of sunspot
magnetic fields. These may be marked-up sunspot maps, large-scale magnetic maps or
tables. If sunspot maps, the magnetic field intensity and polarity is indicated. If
tables, the heliographic position of the spot is given followed by the magnetic classification,
or the maximum strength and polarity, or both; 2) solar magnetograms of the whole
disk, both Kitt Peak and Mt. Wilson daily magnetograms appear in Solar-Geophysical
Data (SGD), a monthly NGDC publication; 3) data on the mean solar magnetic field from
sun-as-a-star integrated light measurements. Stanford daily data appear in SGD. Mean
daily measurements are reported in monthly tables.
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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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Solar Magnetic Field |
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G00533 |
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Uncontrolled Keywords |
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Solar Geophysical Data (SGD) International Standard Serial Numbers
(ISSN)
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'ISSN 0038-0911 Solar Geophysical Data (SGD) Published Monthly'
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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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National Geophysical Data Center (comp) |
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originator |
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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/IONOSPHERE/ |
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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 |
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http://www.ngdc.noaa.gov/stp/ |
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Bounding Box |
Temporal Extent |
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1931-01-01 |
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