Absolute Magnetic Measurements Research Articles

Fog-based automatic true north detection for absolute magnetic declination measurement

Abstract. Absolute magnetic measurements are of great importance in magnetic observatories. They allow not only instrument calibration but also data quality checking. They require the vertical and the geographic or true north as reference directions, usually determined by means of a level and by pointing an azimuth mark, respectively. We present here a novel system able to measure the direction of the magnetic field and of the vertical and true north. A design of a north seeker is proposed taking into account sensor bias as well as misalignment errors. Different methods are derived from this model and measurement results are presented. A measurement test at high latitude is also shown.

150th anniversary of Gauss's first absolute magnetic measurement

150th anniversary of Gauss's first absolute magnetic measurement

Application of vertical variometer‐measurements to the study of secular magnetic variations

The advance of terrestrial magnetism as a science has been largely confined to a better understanding of the magnetic fluctuations generated by processes external to the lithosphere. Aside from the obvious fact that the Earth's magnetic field is locally disturbed by magnetic inhomogeneities of the crustal rocks, our knowledge of the Earth's permanent field is purely descriptive. The magnetic charts now available—useful as they are to the navigator and to the surveyor—have not provided magneticians with data adequate for the formulation of even a tentative hypothesis of the origin of the permanent field and of its secular variations. As the matter stands now, it is unlikely that the mere continuation of the present observational activity will yield facts of a new kind within the next 50 years. The study of secular magnetic variations in other ways than by repeating from time to time absolute magnetic measurements at widely scattered stations offers a good chance for achieving further progress.

Review of[Van Rijckevorsel: Comparison of the instruments for absolute magnetic measurements at different observatories

Terrestrial MagnetismVolume 3, Issue 4 p. 187-187 Review of[Van Rijckevorsel: Comparison of the instruments for absolute magnetic measurements at different observatories] G.W. Littlehales, G.W. LittlehalesSearch for more papers by this author G.W. Littlehales, G.W. LittlehalesSearch for more papers by this author First published: December 1898 https://doi.org/10.1029/TM003i004p00187AboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat No abstract is available for this article. Volume3, Issue4December 1898Pages 187-187 RelatedInformation