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Magnetic Observations at International Polar Year Stations in Canada

L. R. Newitt and E. Dawson
Arctic
Vol. 37, No. 3 (Sep., 1984), pp. 255-262
Stable URL: http://www.jstor.org/stable/40488317
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Magnetic Observations at International Polar Year Stations in Canada
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Abstract

During the First International Polar Year (1882-83) magnetic observatories were established in northern Canada at Fort Rae, Fort Conger, and Clearwater Fiord. Repeat magnetic observations made during the centenary of the First Polar Year enable a determination of the secular variation at each of these locations. During the last 100 years the declination has increased easterly by over 20° at Fort Conger and at Clearwater Fiord; however, it has decreased by only 9° at Fort Rae. The total intensity has decreased by over 1900 nT at Fort Rae, but at Clearwater Fiord and at Fort Conger the decrease has been about 1500 nT and 1000 nT respectively. This implies that the decrease in the non-dipole field evident over most of North America in recent times has not been as great in the high Arctic. /// Des observatoires magnétiques ont été établis dans le nord du Canada, à Fort Rae, à Fort Conger et au fjord Clearwater, au cours de la première Année polaire internationale (1882-83). Une répétition des observations magnétiques effectuée durant le centenaire de la première Année polaire a permis de déterminer la variation séculaire à chacun de ces emplacements. Au cours des dernières 100 années, la déclinaison a augmenté vers l'est de plus de 20° à Fort Conger et au fjord Clearwater, mais n'a diminué que de 9° à Fort Rae. L'intensité totale a diminué de plus de 1900 nT à Fort Rae, mais au fjord Clearwater et à Fort Conger, la diminution n'a été que de 1500 nT et de 1000 nT respectivement. Ces données laissent entendre que la diminution dans le champ non dipolaire, manifeste presque partout en Amérique du Nord dans les temps récents, n'a pas été aussi marquée dans le nord de l'Arctique.

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