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Recent Changes in the Magnetic Dipole Moment of the Earth

B. R. Leaton, +1 more
- 01 Jan 1967 - 
- Vol. 213, Iss: 5081, pp 1110-1110
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TLDR
In this paper, the moment of the equivalent dipole of the geomagnetic field (M) can be deduced in terms of the radius of the Earth (a) from the relation of the relation between the Earth's radius and the first three spherical harmonic coefficients.
Abstract: 
IN the course of an investigation into magnetic secular variation, a number of spherical harmonic analyses were performed on successive 5 year means of results from eighty magnetic observatories. From the first three spherical harmonic coefficients the moment of the equivalent dipole of the geomagnetic field (M) can be deduced in terms of the radius of the Earth (a) from the relation .

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Journal ArticleDOI

Geomagnetic Reversals: Although decreasing rapidly, the earth's magnetic field is probably not now reversing.

Allan Cox
- 17 Jan 1969 - 
Journal ArticleDOI

Lengths of geomagnetic polarity intervals

Allan Cox
- 15 May 1968 - 
TL;DR: In this article, a probability model based on the theory of Bernouli trials was proposed to analyze variations in the lengths of geomagnetic polarity, intervals are analyzed by means of the probability that a polarity inversion will occur during one cycle of change in the geOMagnetic dipole moment.
Journal ArticleDOI

Time Variations of the Earth's Magnetic Field: From Daily to Secular

and V Courtillot, +1 more
- 01 Jan 1988 - 
TL;DR: In this paper, the authors provide a short review of the evolution of the separation of the Earth's magnetic field spectra from the ionosphere to the magnetosphere and the internal magnetic field.
Journal ArticleDOI

The paleomagnetism of single silicate crystals: recording geomagnetic field strength during mixed polarity intervals, superchrons, and inner core growth

John A. Tarduno, +3 more
- 01 Mar 2006 - 
TL;DR: In this paper, the authors used the Thellier double-heating method to determine the geomagnetic field strength of the last 160 million years of the Cretaceous Normal Polarity Superchron.
Journal ArticleDOI

Changes in earth's dipole

Peter Olson, +1 more
- 17 Aug 2006 - 
TL;DR: The dipole moment is stronger today than its long time average, indicating that polarity reversal is not likely unless the current episode of moment decrease continues for a thousand years or more.
References
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Journal ArticleDOI

The Earth's Main Magnetic Field—Epoch 1955.0

H. F. Finch, +1 more
- 01 Nov 1957 - 
TL;DR: In this paper, a brief account of the material employed in the preparation of the Admiralty world charts for epoch 1955.0 is given together with the results of a spherical harmonic analysis made to assist in estimating the field values in poorly observed areas.
Journal ArticleDOI

An Analytical Representation of the Estimated Geomagnetic Field and its Secular Change for the Epoch 1965.0

B. R. Leaton, +2 more
- 01 Jan 1965 - 
TL;DR: In this article, the Schmidt quasi-normal coefficients up to 8th order and degree for the main field and up to the 6th order for its rate of change have been derived from surface and airborne observations of magnetic declination from 1955 to mid-June 1964.
Journal ArticleDOI

Main Characteristics of Recent Geomagnetic Secular Variation

Takesi Nagata
- 01 Jan 1965 - 
TL;DR: In this paper, the authors discussed theoretical interpretations of the five main geomagnetic properties of the earth's core and proposed a theoretical interpretation of these five properties based on the concept of the hydromagnetic dynamo.
Journal ArticleDOI

Mathematical model of the geomagnetic field for 1965

L. Hurwitz, +3 more
- 01 May 1966 - 
TL;DR: A mathematical model of the geomagnetic field for 1965 is presented in this article, where the field is given by internal and external spherical harmonic coefficients to degree and order 12.0 and the smoothed surface field defined by the model (and by the charts exactly drawn from the model) is believed to be at least as faithful to nature as that defined by any previously published model or set of charts.
Journal ArticleDOI

Geomagnetic Secular Variation during the Period from 1950 to 1955

Takesi Nagata, +1 more
- 01 Jan 1957 - 
TL;DR: The geomagnetic secular variation during the period from 1950 to 1955 is estimated on the basis of annual mean values of the Geomagnetic field at some seventy magnetic observatories distributed all over the earth as mentioned in this paper.