An Anomaly in Geomagnetic Variations at Mould Bay in the Arctic Archipelago of Canada
Standard-run magnetograms obtained from Mould Bay, Prince Patrick Island, demonstrate a striking absence of vertical magnetic field variations corresponding to an anomalous steepening of the vertical field power spectrum. Assuming the presence of a sheet conductor at depth, it is estimated from the...
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1963
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fthighwire:oai:open-archive.highwire.org:gji:8/1/26 2023-05-15T14:28:50+02:00 An Anomaly in Geomagnetic Variations at Mould Bay in the Arctic Archipelago of Canada Whitham, Kenneth 1963-09-01 00:00:00.0 text/html http://gji.oxfordjournals.org/cgi/content/short/8/1/26 https://doi.org/10.1111/j.1365-246X.1963.tb02897.x en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/8/1/26 http://dx.doi.org/10.1111/j.1365-246X.1963.tb02897.x Copyright (C) 1963, Oxford University Press Articles TEXT 1963 fthighwire https://doi.org/10.1111/j.1365-246X.1963.tb02897.x 2012-11-23T22:10:39Z Standard-run magnetograms obtained from Mould Bay, Prince Patrick Island, demonstrate a striking absence of vertical magnetic field variations corresponding to an anomalous steepening of the vertical field power spectrum. Assuming the presence of a sheet conductor at depth, it is estimated from the frequency dependence of the spectrum that a 20 km thick layer with a conductivity about 10−11 e.m.u. is required near the bottom of the crust. There appears to be no evidence for such a highly conducting crust. Anomalous temperatures difficult to reconcile with a stable region are required to explain the anomaly by semiconduction processes. The extent of the Mould Bay anomaly is as yet unexplored. Russian results (Zhigalov 1960), and a search of Arctic magnetograms available here, show that severe attenuation of the vertical field fluctuations occurs over the deep ocean basins. It is concluded that the magnitude of the attenuation found on drifting stations can be explained by the presence of the conducting ocean, with reasonable estimates of the wavelength of the inducing field. However, it appears unlikely that the Mould Bay results can be so explained. Text Arctic Archipelago Arctic Mould Bay Prince Patrick Island HighWire Press (Stanford University) Arctic Canada Mould Bay ENVELOPE(-119.436,-119.436,76.197,76.197) Prince Patrick Island ENVELOPE(-119.507,-119.507,76.751,76.751) Geophysical Journal International 8 1 26 43 |
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HighWire Press (Stanford University) |
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fthighwire |
language |
English |
topic |
Articles |
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Articles Whitham, Kenneth An Anomaly in Geomagnetic Variations at Mould Bay in the Arctic Archipelago of Canada |
topic_facet |
Articles |
description |
Standard-run magnetograms obtained from Mould Bay, Prince Patrick Island, demonstrate a striking absence of vertical magnetic field variations corresponding to an anomalous steepening of the vertical field power spectrum. Assuming the presence of a sheet conductor at depth, it is estimated from the frequency dependence of the spectrum that a 20 km thick layer with a conductivity about 10−11 e.m.u. is required near the bottom of the crust. There appears to be no evidence for such a highly conducting crust. Anomalous temperatures difficult to reconcile with a stable region are required to explain the anomaly by semiconduction processes. The extent of the Mould Bay anomaly is as yet unexplored. Russian results (Zhigalov 1960), and a search of Arctic magnetograms available here, show that severe attenuation of the vertical field fluctuations occurs over the deep ocean basins. It is concluded that the magnitude of the attenuation found on drifting stations can be explained by the presence of the conducting ocean, with reasonable estimates of the wavelength of the inducing field. However, it appears unlikely that the Mould Bay results can be so explained. |
format |
Text |
author |
Whitham, Kenneth |
author_facet |
Whitham, Kenneth |
author_sort |
Whitham, Kenneth |
title |
An Anomaly in Geomagnetic Variations at Mould Bay in the Arctic Archipelago of Canada |
title_short |
An Anomaly in Geomagnetic Variations at Mould Bay in the Arctic Archipelago of Canada |
title_full |
An Anomaly in Geomagnetic Variations at Mould Bay in the Arctic Archipelago of Canada |
title_fullStr |
An Anomaly in Geomagnetic Variations at Mould Bay in the Arctic Archipelago of Canada |
title_full_unstemmed |
An Anomaly in Geomagnetic Variations at Mould Bay in the Arctic Archipelago of Canada |
title_sort |
anomaly in geomagnetic variations at mould bay in the arctic archipelago of canada |
publisher |
Oxford University Press |
publishDate |
1963 |
url |
http://gji.oxfordjournals.org/cgi/content/short/8/1/26 https://doi.org/10.1111/j.1365-246X.1963.tb02897.x |
long_lat |
ENVELOPE(-119.436,-119.436,76.197,76.197) ENVELOPE(-119.507,-119.507,76.751,76.751) |
geographic |
Arctic Canada Mould Bay Prince Patrick Island |
geographic_facet |
Arctic Canada Mould Bay Prince Patrick Island |
genre |
Arctic Archipelago Arctic Mould Bay Prince Patrick Island |
genre_facet |
Arctic Archipelago Arctic Mould Bay Prince Patrick Island |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/8/1/26 http://dx.doi.org/10.1111/j.1365-246X.1963.tb02897.x |
op_rights |
Copyright (C) 1963, Oxford University Press |
op_doi |
https://doi.org/10.1111/j.1365-246X.1963.tb02897.x |
container_title |
Geophysical Journal International |
container_volume |
8 |
container_issue |
1 |
container_start_page |
26 |
op_container_end_page |
43 |
_version_ |
1766302987804737536 |