Determining Dynamo Region Properties from Observations of a Planet's Magnetic Field

Details Determining Dynamo Region Properties from Observations of a Planet's Magnetic Field Determining Dynamo Region Properties from Observations of a Planet's Magnetic Field

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmgp11b0084s&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #GP11B-0084

Other

1510 Dynamo: Theories And Simulations, 1595 Planetary Magnetism: All Frequencies And Wavelengths, 5430 Interiors (8147), 5440 Magnetic Fields And Magnetism

Scientific paper

Determining properties of a planet's deep interior is difficult because we cannot observe this region directly as we can the surface of a planet. On Earth, seismology has provided important information on the structure and composition of the deep interior, including the core. In addition, properties of the Earth's outer core motions have been determined mostly from observations of the geomagnetic field secular variation. Unfortunately we are not at present able to conduct detailed seismic studies and observations of magnetic field secular variation for other planets to provide us with the same quality of information on their cores. We are, however, capable of studying a planet's magnetic field morphology quite extensively with an orbiting spacecraft at relatively low altitude. Here we use numerical dynamo models to determine what magnetic field structures can tell us about a planet's core. We concentrate on properties such as inner core size and outer core convective vigor. We determine that dipole and non-dipole field generation can occur in very different regions of the core, depending on the inner core size and Rayleigh number. This type of study can aid in determining the internal structure and evolution of Mercury, Jupiter, Saturn and Ganymede, planetary bodies for which little is known about these properties.

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