Is the non-dipole magnetic field random?
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Is the non-dipole magnetic field random?

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC, Springfield, Va .
Written in English


  • Earth core,
  • Geomagnetism,
  • Random processes,
  • Normal density functions

Book details:

Edition Notes

Other titlesIs the non dipole magnetic field random?
StatementAndrew D. Walker and George E. Backus.
Series[NASA contractor report] -- NASA-CR-204906., NASA contractor report -- NASA CR-204906.
ContributionsBackus, George E., United States. National Aeronautics and Space Administration.
The Physical Object
Pagination1 v.
ID Numbers
Open LibraryOL17822432M

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The main magnetic field of the Earth is a complex phenomenon. To understand its origins in the fluid of the Earth's core, and how it changes in time requires a variety of mathematical and physical tools. This book presents the foundations of . Disc accretion to a rotating star with a non-dipole magnetic field is investigated for the first time in full three-dimensional (3D) magnetohydrodynamic (MHD) simulations. Request PDF | Non-dipole fields and inclination bias: Insights from a random walk analysis | The paleomagnetic assumption that the Earth’s magnetic field is reduced to a . Free decay of the non-dipole magnetic field is studied when the core is rotating relative to the conducting mantle. In the first place, the decay time for a stationary core is calculated, giving the time constants of years for the field n = 2 and years for n = 3. Secondly the effects of the weakly conducting mantle both on the decay constants and on the rotation of the fields are Cited by:

  To understand this properly you shall need to go beyond semi-classical non-relativistic, or partially relativistic approximation methods, and at least learn about the Dirac equation, which is the relativistic generalization of the Schrödinger equa.   However, this is not the case; any increase in the non-dipole field has been shown to be much smaller than the decrease in the dipole field.6 Thus, the total energy of the earth’s magnetic field is decaying and therefore supports a recent creation.   Results indicate that the non-dipole terms contribute on a global scale of Cited by: 3. (After Gilliland ) Strength (r= T) Spatial structure References 5 (D I Location e rn v) 3 0 Surface Dipole field (at magnetic poles) 2 Non-dipole field Mainly dipolar, with dipole axis McElhinny and Evans (); Opdyke inclined about 11" to the axis of (); P. H. Roberts and Soward () rotation at the present time.

‘In the most accurately recorded period, from to , the total (dipole plus non-dipole) energy in the earth’s magnetic field has steadily decreased by ±%. At that rate, the field would lose at least half its energy every years, give or take a century or so. The Earth's North Magnetic Pole is the wandering point on the Earth's surface at which the Earth's magnetic field points vertically downwards (i.e. the "dip" is 90°). That is correct now, but is it still correct before or after a geomagnetic reversal? If so, the North Magnetic Pole means the Earth's south-seeking pole, and it has been. The Earth’s magnetic field, that is central in the remanence and induced processes, is itself complex. Spherical harmonic analysis provides the means of characterizing the Earth’s magnetic field and with such a representation; it is possible to predict the geomagnetic dipolar field and other non-dipolar by: 2.   It describes the magnetic field generated by an electric current. Interaction is the key point of inquiry IMO. We have a mildly varying electric and magnetic field from the sun, we have a hugely varying dynamo within the earth. Varying in spatial attributes, intensity and sense.