Other
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufm.p43e..07b&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #P43E-07
Other
[1507] Geomagnetism And Paleomagnetism / Core Processes, [1510] Geomagnetism And Paleomagnetism / Dynamo: Theories And Simulations, [5440] Planetary Sciences: Solid Surface Planets / Magnetic Fields And Magnetism
Scientific paper
An intermittent tidal strain could provide a means to drive the ancient Martian dynamo. A suite of laboratory observations has been performed to validate the excitation of a rotational parametric instability (RPI) from the periodic proximity of a tide raising body. RPI arises through straining of otherwise circular streamlines which couple inertial modes of the fluid core giving rise to growth, collapse and decay of large scale flows when viscous and ohmic damping are overcome. In our laboratory, a tide-like instability is imposed on a rotating contained fluid through an independently controlled, traveling elliptical perturbation which can be turned on and off for set times relative the apparatus' fluid spin-up time. Results of our pulsed RPI experiment will be reported which model the coming and going of a body in the Martian neighborhood as a means to sustain a planetary dynamo.
Aldridge Keith D.
Baker Robin R.
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