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Historical Data for Geomagnetic Field ModellingDescribed here are the various types of historical data (by which we mean actual measurements of the field taken in the past) which are available for geomagnetic field modelling, concentrating exclusively on observations made prior to the 20th century. These data take quite diverse forms, being derived from voyages of discovery or scientific expeditions, from surveys on land, or from observatories after the formation of the Gottingen Magnetic Union. Toward the latter part of the 19th Century, declination was measured quite regularly by various naval vessels for the purpose of constructing charts. Prior to the invention of a method for measuring field intensities by Gauss in 1832, all measurements were of declination or inclination. During the 19th Century over 40,000 observations are available in one year (the first International Polar Year 1882-83). Prior to 1800 there are only of the order of 12,000 measurements. We discuss measurement methods and the types of instruments used, and focus on specific problems which have been noted, such as those associated with the measurement of intensity on iron ships in the late 19th Century.
Document ID
19920019378
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Jackson, Andrew
(Oxford Univ. Oxford, United Kingdom)
Date Acquired
September 6, 2013
Publication Date
June 1, 1992
Publication Information
Publication: NASA. Goddard Space Flight Center, Types and Characteristics of Data for Geomagnetic Field Modeling
Subject Category
Geophysics
Accession Number
92N28621
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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