Turbulent structure in Earth's fluid core inferred from time series of geomagnetic dipole moment

Details Turbulent structure in Earth's fluid core inferred from time series of geomagnetic dipole moment Turbulent structure in Earth's fluid core inferred from time series of geomagnetic dipole moment

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3415308s&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 15, CiteID L15308

Physics

Geophysics

5

Geomagnetism And Paleomagnetism: Core Processes (1213, 8115), Geomagnetism And Paleomagnetism: Dynamo: Theories And Simulations, Geomagnetism And Paleomagnetism: Time Variations: Secular And Longer, Mathematical Geophysics: Spectral Analysis (3205, 3280), Nonlinear Geophysics: Turbulence (3379, 4568, 7863)

Scientific paper

The physical grounds are discussed for assessing turbulent structures hidden inside the Earth's liquid core by using a time series of the geomagnetic dipole moment obtained from historical and paleomagnetic data. We propose the idea that the time-averaged wavenumber spectra of electric current density at the core-mantle boundary (CMB) and also velocity near the CMB have relation to the frequency spectrum of the dipole moment. We performed computer simulations of a magnetohydrodynamic spherical dynamo to verify this idea. We show that the frequency spectrum of the dipole moment in the simulation is similar to that inferred by paleomagnetic observations. The simulation results indicate that the underlying kinetic energy spectrum is proportional to m -5/3 in a high wavenumber range, where m is the azimuthal wavenumber. We speculate that a similar turbulent energy spectrum may exist in the Earth's core with a peak near m = 5.

Affiliated with

Also associated with

No associations

Rating

Turbulent structure in Earth's fluid core inferred from time series of geomagnetic dipole moment does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Turbulent structure in Earth's fluid core inferred from time series of geomagnetic dipole moment, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Turbulent structure in Earth's fluid core inferred from time series of geomagnetic dipole moment will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-973729