Historical data for geomagnetic field modelling
Described 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 deri...
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ftnasantrs:oai:casi.ntrs.nasa.gov:19920019378 2023-05-15T16:53:56+02:00 Historical data for geomagnetic field modelling Jackson, Andrew Unclassified, Unlimited, Publicly available Jun 1, 1992 http://ntrs.nasa.gov/search.jsp?R=19920019378 unknown http://ntrs.nasa.gov/search.jsp?R=19920019378 Accession ID: 92N28621 No Copyright CASI 46 NASA. Goddard Space Flight Center, Types and Characteristics of Data for Geomagnetic Field Modeling; p 1-30 1992 ftnasantrs 2012-02-15T19:21:05Z Described 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. Other/Unknown Material International Polar Year NASA Technical Reports Server (NTRS) |
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Open Polar |
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NASA Technical Reports Server (NTRS) |
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ftnasantrs |
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unknown |
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46 |
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46 Jackson, Andrew Historical data for geomagnetic field modelling |
topic_facet |
46 |
description |
Described 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. |
format |
Other/Unknown Material |
author |
Jackson, Andrew |
author_facet |
Jackson, Andrew |
author_sort |
Jackson, Andrew |
title |
Historical data for geomagnetic field modelling |
title_short |
Historical data for geomagnetic field modelling |
title_full |
Historical data for geomagnetic field modelling |
title_fullStr |
Historical data for geomagnetic field modelling |
title_full_unstemmed |
Historical data for geomagnetic field modelling |
title_sort |
historical data for geomagnetic field modelling |
publishDate |
1992 |
url |
http://ntrs.nasa.gov/search.jsp?R=19920019378 |
op_coverage |
Unclassified, Unlimited, Publicly available |
genre |
International Polar Year |
genre_facet |
International Polar Year |
op_source |
CASI |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19920019378 Accession ID: 92N28621 |
op_rights |
No Copyright |
_version_ |
1766044541603807232 |