Výsledky vyhledávání - "L. R. Newitt"

Location of the North Magnetic Pole in April 2007

Autor: J. J. Orgeval, L. R. Newitt, Arnaud Chulliat

Publikováno v: Earth, Planets and Space. 61:703-710

Observations have been made at five locations in the vicinity of the North Magnetic Pole (NMP). These were used in four different analyses—virtual geomagnetic pole, simple polynomial, spherical cap harmonic, best fitting grid—to derive positions

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c810c345a8bded8945c360a1a7c164c6
https://doi.org/10.1186/bf03353178

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An Evaluation of a Regional Orthogonal Field Model for Canada with Respect to the Canadian Geomagnetic Reference Field

Autor: V. P. Golovkov, L. R. Newitt

Publikováno v: Journal of geomagnetism and geoelectricity. 49:337-346

Regional spatial-temporal models of the geomagnetic field have been produced by a variety of techniques. Recently, spherical cap harmonic analysis has gained wide acceptance as a means of modelling the magnetic field over a portion of the globe. Time

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6c886bfbcabbdc1e6140f510c6369338
https://doi.org/10.5636/jgg.49.337

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The Position of the North Magnetic Dip Pole in 1994

Autor: C. E. Barton, L. R. Newitt

Publikováno v: Journal of geomagnetism and geoelectricity. 48:221-232

In the spring of 1994, a survey was carried out to redetermine the position of the North Magnetic Pole (NMP). Observations of declination, inclination, and total intensity were made at eight sites around the expected location of the pole. All observa

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::d502a618f0ea130400e56c79ba40a594
https://doi.org/10.5636/jgg.48.221

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A historical summary of Geological Survey of Canada studies of earthquake seismology and geomagnetism

Autor: P. W. Basham, L. R. Newitt

Publikováno v: Canadian Journal of Earth Sciences. 30:372-390

The solid-earth geophysical sciences of seismology and geomagnetism have roots in Canada that predate the founding of the Geological Survey of Canada (GSC) in 1842. These sciences matured in the Dominion Observatory, which was formed in 1904, and cam

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::f2eea589c1a080eef797f2c18cc8a82f
https://doi.org/10.1139/e93-028

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Magnetic flux expulsion from the core as a possible cause of the unusually large acceleration of the north magnetic pole during the 1990s

Autor: L. R. Newitt, Arnaud Chulliat, Gauthier Hulot

Publikováno v: Journal of Geophysical Research : Solid Earth
Journal of Geophysical Research : Solid Earth, American Geophysical Union, 2010, 115 (B7), pp.B07101. ⟨10.1029/2009JB007143⟩
Journal of Geophysical Research : Solid Earth, American Geophysical Union, 2010, 115, pp.B07101. ⟨10.1029/2009JB007143⟩

International audience; The north magnetic pole (NMP) has been drifting in a north‐northwesterly direction since the 19th century. Both local surveys and geomagnetic models derived from observatory and satellite data show that the NMP suddenly acce

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::b8c937dfa0abfeca0c6ce3baf1d28b7e
https://doi.org/10.1029/2009jb007143

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Comparison of IGRF Candidate Models with the Canadian Geomagnetic Reference Field for 1985-1995

Autor: L. R. Newitt, G. V. Haines

Publikováno v: Journal of geomagnetism and geoelectricity. 44:871-880

The DGRF/IGRF candidate models have been compared to the Canadian Geomagnetic Reference Field 1990 (CGRF90) over the approximate area of Canada. It is found that all candidate models for 1985 are of equal quality when compared to the CGRF90. For 1990

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::211b258edc307146f5c53e1bede3252e
https://doi.org/10.5636/jgg.44.871

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Removing magnetic activity from high latitude magnetic repeat station observations

Autor: J. K. Walker, L. R. Newitt

Publikováno v: Journal of geomagnetism and geoelectricity. 42:937-949

The temporal magnetic disturbances which occur during magnetic repeat station surveys cause errors in the determination of the main field secular variation. However, their effects can be significantly reduced by optimizing the survey period and by mo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::87be9d4f54b57a096feaae347bc0ad98
https://doi.org/10.5636/jgg.42.937

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What Caused Recent Acceleration of the North Magnetic Pole Drift?

Autor: Gauthier Hulot, L. R. Newitt, Arnaud Chulliat, Jean-Jacques Orgeval

Publikováno v: Eos, Transactions American Geophysical Union. 91:501-502

The north magnetic pole (NMP) is the point at the Earth's surface where the geomagnetic field is directed vertically downward. It drifts in time as a result of core convection, which sustains the Earth's main magnetic field through the geodynamo proc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::90f54d97d12b57f3f7f995d706fd29d8
https://doi.org/10.1029/2010eo510001

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