Solar Magnetic FieldAlternate Views: Get Data, FAQ, ISO Rubric, DOI Rubric, CSW, HTML, Components, XML
Solar Magnetic Field
G00533
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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http://www.ngdc.noaa.gov/stp/
ftp://ftp.ngdc.noaa.gov/STP/IONOSPHERE/
http://www.ngdc.noaa.gov/stp
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Solar Data Manager
DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce
Contact Data Center
303.497.6133 or 303.497.6323
7:30 - 4:30 Mountain
Fees
Depends on the Data Set


Ordering Instructions
Ordering Instructions: Prepay by check, money order or bank card. There is a standard handling charge, with additional costs for special handling. Orders may be placed via fax, email, regular mail or telephone Custom Order Process: Contact data center for information

Non-Digital Form: Paper Pages Ordering Instructions: Price information is available upon request. Prepay by check, money order or bank card There is a standard handling charge, with additional costs for special handling. Orders may be placed via fax, email, regular mail or telephone Custom Order Process: Contact data center for information

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Access Constraints: No Constraints Use Constraints: None Distribution Liability: While every effort has been made to ensure that these data are accurate and reliable within the limits of the current state of the art, NOAA cannot assume liability for any damages caused by any errors or omissions in the data, nor as a result of the failure of the data to function on a particular system. NOAA makes no warranty, expressed or implied, nor does the fact of distribution constitute such a warranty.