Characterizing the magnetic fields of Mars: What do the tell us about the history of Mars? Michael Purucker, Raytheon Planetary Geodyn. Laboratory,

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Presentation transcript:

Characterizing the magnetic fields of Mars: What do the tell us about the history of Mars? Michael Purucker, Raytheon Planetary Geodyn. Laboratory, GSFC/NASA Greenbelt Inst. Planet. Res.,DLR, Berlin: 23 Feb 2005

Outline What controls the observed magnetic field? A new magnetization model for Mars A magnetic history of Mars

What controls the observed magnetic fields ? Core field strength, geometry, and duration Thickness of magnetic crust Material properties of magnetic crust Subsequent history such as impacts and tectonics (Radial field at 200 km)

Comparative magnetic properties Purucker, 2002: Memoire Proposal

Power spectra compared Voorhies et al, 2002 and Olsen, 2002

Magnetic fields reflect crustal thickness variations

Magnetic fields can be described by source functions (magnetizations) on a global basis. Magnetization highs also correspond globally to areas of thick cool crust as determined by seismology

Martian crustal thickness Few, if any, magnetic features are predicted by the above crustal thickness model and a dipolar magnetic field, suggesting either that magnetic thickness variations are not an important at Mars, or that we don’t yet have a good handle on the (magnetic) crustal thickness.

Magnetics are also useful for tectonic interpretations

Inclination M A new magnetization model Whaler and Purucker, 2005

Interpretation of a new magnetization model

Old terranes lacking large-scale magnetizations Purucker, 2002

Mars’ most intense magnetic fields Purucker, 2002

Structural control of Valles Marineris Purucker et al., 2001

A new paleomagnetic pole made using the distribution and intensity of large scale magnetic features

External field at Mars In addition to a static external field, there are dynamic fields associated with magnetopause boundary crossing in the northern hemisphere. External fields are currently the limiting factor in describing the crustal magnetic field at Mars.

Conclusions Much as we create a chronology tied to a planet’s impact history, we can create a chronology of magnetic events. We still have a poor understanding of the factors responsible for Mars’ intense crustal magnetic field Paleomagnetic poles can provide information on large-scale geodynamic problems. Further progress will come through a better understanding of the external field, and new, lower altitude observations.