Quasi-geostrophic flows responsible for the secular variation of the Earth's magnetic field

Details Quasi-geostrophic flows responsible for the secular variation of the Earth's magnetic field Quasi-geostrophic flows responsible for the secular variation of the Earth's magnetic field

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008geoji.173..421p&link_type=abstract

Geophysical Journal International, Volume 173, Issue 2, pp. 421-443.

Astronomy and Astrophysics

Astronomy

22

Inverse Theory, Earth Rotation Variations, Dynamo: Theories And Simulations, Rapid Time Variations, Satellite Magnetics

Scientific paper

We present core flows constructed from high resolution secular variation (SV) models for the epochs 2001, 2002.5 and 2004, assuming that these flows are quasi-geostrophic in the core interior and that they do not cross the axial cylindrical surface tangent to the inner core. A large jet encircling the inner core and carrying a significant part of the core angular momentum and axial vortices of ~700 km diameter mainly clustering around the cylinder tangent to the solid inner core, are inferred from geomagnetic SV. New regularizations are suggested from dynamic considerations. It is found that medium and small-scale velocity fields contribute significantly to the large-scale SV. Accordingly, final models of core flows are calculated after an iterative process, whereby the magnetic field variation produced by small-scale stochastic magnetic fields and medium to small-scale computed velocity fields are incorporated into the inversion itself as modelling errors. This study represents a significant step in an effort to join geomagnetic observations and the fluid core dynamics on short timescales.

Affiliated with

Also associated with

No associations

Rating

Quasi-geostrophic flows responsible for the secular variation of the Earth's magnetic field 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 Quasi-geostrophic flows responsible for the secular variation of the Earth's magnetic field, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Quasi-geostrophic flows responsible for the secular variation of the Earth's magnetic field will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1540131