Will the magnetic North Pole move to Siberia?

Olsen, Nils; Mandéa, Mioara

doi:10.1029/2007eo290001

Cited by 46 publications

(31 citation statements)

References 7 publications

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“…The abrupt increase in velocity of the NMP at the Earth's surface is linked to a reversed polar flux patch at the CMB, as also noted by Olsen and Mandea (2007). The current position of the NMP is straight above this patch.…”

Section: Discussionmentioning

confidence: 66%

“…The CHAOS model suggests, however, that the velocity has recently started to decrease. This is more clearly shown in a recent study by Olsen and Mandea (2007) from an improved version of the CHAOS model. We performed analyses of power spectral densities, using the adaptive multi-taper method of Riedel and Sidorenko (1995) and program "cross" by R. L. Parker.…”

Section: From Decades To Centuriesmentioning

confidence: 74%

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Magnetic poles and dipole tilt variation over the past decades to millennia

Korte

Mandéa

2008

Earth Planet Sp

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Due to the strong dipolar character of the geomagnetic field the shielding effect against cosmic and solar ray particles is weakest in the polar regions. We here present a comprehensive study of the evolution of magnetic and geomagnetic pole locations and the Earth's magnetic core field in both polar regions over the past few years to millennia. North and south magnetic poles change independently according to the asymmetric complexity of the field in the two hemispheres, and the changes are not correlated to variations of the dipole axis. The recent, strong acceleration of the north magnetic pole motion appears to be linked to a reverse flux patch at the coremantle boundary, and an increasing deceleration of the pole over the next years seems likely. Over the whole studied period of 7000 years two periods of comparatively high velocity of the north magnetic pole are observed at 4500 BC and 1300 BC, based on the presently available data and models. Geographic latitudes and longitudes of magnetic and geomagnetic poles based on the studied geomagnetic field models are available together with animations of the poles and polar field behaviour from our webpage http://www.gfz-potsdam.de/geomagneticfield/poles.

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Section: Discussionmentioning

confidence: 66%

Section: From Decades To Centuriesmentioning

confidence: 74%

Magnetic poles and dipole tilt variation over the past decades to millennia

Korte

Mandéa

2008

Earth Planet Sp

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“…Observations from satellites, magnetic observatories, and field surveys show that the NMP drift speed suddenly increased in the 1990s [Newitt and Barton, 1996;Newitt et al, 2002], from 15 kilometers per year in 1990 to about 60 kilometers per year in 2002, after which it slowly decreased [Olsen and Mandea, 2007;Newitt et al, 2009]. This phe nomenon was observed in both field survey measurements and global geomagnetic models ( Figure 1a).…”

Section: Sudden Acceleration In the 1990smentioning

confidence: 68%

“…It followed more than 150 years of slow drift at less than 15 kilome ters per year, starting with the first location of the NMP by Ross. This sudden accelera tion contrasts with the behavior of the south magnetic pole, which has a drift speed that has never exceeded 15 kilometers per year since the beginning of the twentieth century [Olsen and Mandea, 2007].…”

Section: Sudden Acceleration In the 1990smentioning

confidence: 76%

What Caused Recent Acceleration of the North Magnetic Pole Drift?

et al. 2010

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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 process. During the 1990s the NMP drift speed suddenly increased from 15 kilometers per year at the start of the decade to 55 kilometers per year by the decade's end. This acceleration was all the more surprising given that the NMP drift speed had remained less than 15 kilometers per year over the previous 150 years of observation.

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“…In a recent Eos article, Olsen and Mandea [2007] commented on the rapid motion of the north magnetic pole (NMP) and the ability of recent magnetic field models based on satellite data to give accurate positions for the magnetic poles. The most recent local survey to determine the posi tion of the NMP, carried out in April 2007, confirms their observations concerning the movement of the NMP and supports their thesis that reference field models can now accurately locate the magnetic poles.…”

mentioning

confidence: 99%

Comment on “Will the magnetic North Pole move to Siberia?”

Newitt¹,

Chulliat

2007

EoS Transactions

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In a recent Eos article, Olsen and Mandea [2007] commented on the rapid motion of the north magnetic pole (NMP) and the ability of recent magnetic field models based on satellite data to give accurate positions for the magnetic poles. The most recent local survey to determine the position of the NMP, carried out in April 2007, confirms their observations concerning the movement of the NMP and supports their thesis that reference field models can now accurately locate the magnetic poles. We were able to observe at four locations all within approximately 100 kilometers of the estimated pole position. This small sample, plus one observation made in 2005, is sufficient to reveal that the position of the NMP on 29 April 2007 was 83.95°N, 121.02°W, with a positional uncertainty of approximately 40 kilometers (L.R. Newitt et al., manuscript in preparation, 2007). This is in close agreement with positions derived from recent spherical harmonic models that are based on satellite magnetic data. For example, the NMP position derived from the CHAOS model is within 35 kilometers of the observed position.

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Will the magnetic North Pole move to Siberia?

Cited by 46 publications

References 7 publications

Magnetic poles and dipole tilt variation over the past decades to millennia

Magnetic poles and dipole tilt variation over the past decades to millennia

What Caused Recent Acceleration of the North Magnetic Pole Drift?

Comment on “Will the magnetic North Pole move to Siberia?”

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