Electromagnetic torques in the core and resonant excitation of decadal polar motion

Details Electromagnetic torques in the core and resonant excitation of decadal polar motion Electromagnetic torques in the core and resonant excitation of decadal polar motion

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005geoji.160..721m&link_type=abstract

Geophysical Journal International, Volume 160, Issue 2, pp. 721-728.

Astronomy and Astrophysics

Astronomy

4

Core Dynamics, Earth Rotation, Markowitz Wobble, Torsional Oscillations

Scientific paper

Motion of the rotation axis of the Earth contains decadal variations with amplitudes on the order of 10 mas. The origin of these decadal polar motions is unknown. A class of rotational normal modes of the core-mantle system termed torsional oscillations are known to affect the length of day (LOD) at decadal periods and have also been suggested as a possible excitation source for the observed decadal polar motion. Torsional oscillations involve relative motion between the outer core and the surrounding solid bodies, producing electromagnetic torques at the inner-core boundary (ICB) and core-mantle boundary (CMB). It has been proposed that the ICB torque can explain the excitation of the approximately 30-yr-period polar motion termed the Markowitz wobble. This paper uses the results of a torsional oscillation model to calculate the torques generated at Markowitz and other decadal periods and finds, in contrast to previous results, that electromagnetic torques at the ICB can not explain the observed polar motion.

Affiliated with

Also associated with

No associations

Rating

Electromagnetic torques in the core and resonant excitation of decadal polar motion 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 Electromagnetic torques in the core and resonant excitation of decadal polar motion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electromagnetic torques in the core and resonant excitation of decadal polar motion will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1358997