Analogy between the Drift Planetary Vortices and the Precession of a Spinning Body

Details Analogy between the Drift Planetary Vortices and the Precession of a Spinning Body Analogy between the Drift Planetary Vortices and the Precession of a Spinning Body

Jun 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996stin...9819801n&link_type=abstract

Technical Report, PB97-128375; FOA-R-96-00243-2.2-SE Avdelningen foer Styrning, Material och Undervattenssensorer

Physics

Rotating Bodies, Disks (Shapes), Vortices, Analogies, Planetary Rotation, Planetary Surfaces, Equations Of Motion, Inertia, Vortex Precession, Oblate Spheroids, Rotating Spheres, Equators, Monopoles, Latitude

Scientific paper

The physical origin of a well-known expression for the drift velocity of a monopole vortex on a rotating planet is clarified. It is shown that this drift can be obtained from the equation of motion of a small, rotating disk on the surface of the planet. A rotating planet is slightly oblate, and in an inertial frame, there is a net force on the disk directed from the equator toward the closest pole. The drift along a latitude circle caused by this force is completely analogous to the precession of a spinning body.

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