Worldwide Magnetograms with Geomagnetic Components D, H, Z, or X, Y, and Z

Metadata Updated: May 29, 2014

The National Geophysical Data Center receives magnetograms from over 200 geomagnetic observatories. The Center archives data from 1867 to the present, however the primary holdings are from 1957 to the present. The archives contain over 5,000 reels of 35 mm microfilm copies of magnetograms. Magnetograms are records obtained from an instrument known as a magnetometer which is designed to measure small variations in the components of the geomagnetic field. There are two types of magnetometers, the La Cour and the Ruska. The magnetogram consists of one or more (usually 3) variometers, one for each element usually D, H, Z (less common X, Y, Z) and a recorder. The standard magnetogram usually has all three components recorded simultaneously on one sheet of paper. In addition to the 3 traces, reference lines (baselines) are recorded. The baselines are used in absolute calibration of the magnetogram. The normal recording speed is 20 mm/hour with the drum turning once in 24 hours.

Access & Use Information

License: No license information was provided. If this work was prepared by an officer or employee of the United States government as part of that person's official duties it is considered a U.S. Government Work.

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Dates

Metadata Date May 28, 2013
Metadata Created Date Aug 20, 2013
Metadata Updated Date May 29, 2014
Reference Date(s) Jan 01, 1957 (publication)
Frequency Of Update weekly

Metadata Source

Harvested from NGDC - STP - Geomag - iso

Additional Metadata

Resource Type Dataset
Metadata Date May 28, 2013
Metadata Created Date Aug 20, 2013
Metadata Updated Date May 29, 2014
Reference Date(s) Jan 01, 1957 (publication)
Responsible Party DOC/NOAA/NESDIS/NGDC > National Geophysical Data Center, NESDIS, NOAA, U.S. Department of Commerce (Point of Contact)
Contact Email
Access Constraints Use Constraints: None, Access Constraints: No Constraints
Bbox East Long 180.000000
Bbox North Lat 90.000000
Bbox South Lat -90.000000
Bbox West Long -180.000000
Coupled Resource
Frequency Of Update weekly
Guid gov.noaa.ngdc.stp.geomag:G00583
Harvest Object Id 102be0b7-1231-4604-9ed9-9d873f99b6d2
Harvest Source Id 21ab3ced-499d-4f59-bb62-448fe06ef827
Harvest Source Title NGDC - STP - Geomag - iso
Licence 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.
Metadata Language
Metadata Type geospatial
Spatial Data Service Type
Spatial Reference System
Spatial Harvester True
Temporal Extent Begin 1957-01-01

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