Geodynamics Science Highlight
NASA GSFC Geodynamics 921

SCIENCE HIGHLIGHT

Geodynamics Branch, Code 921

December 2003

Geodynamics Branch Contributions to Special Fall AGU Sessions - 2

Purucker, with Whaler, Fox-Maule and Olsen, Investigates Crustal Magnetic Fields on Earth and Mars

intensity of the radial component of magnetization

Mike Purucker and Kathy Whaler (Edinburgh) interpreted a new, continuous, high-resolution magnetization map of Mars (below) in terms of a global series of magnetic field creation events (1), magnetic field destruction events (2), and again, later events, which simply modify the existing magnetic field patterns (3). These events are shown on the map below, which shows the intensity of the radial component of magnetization.

Results of a new technique for estimating regional heat flux under the Antarctic ice cap

Cathrine Fox Maule (Copenhagen and GSFC), with coauthors Mike Purucker and Nils Olsen (Copenhagen), described a new technique for estimating regional heat flux under Antarctica using CHAMP magnetic field data. The method depends on the loss of permanent magnetization at the ~ 600 degrees Centigrade depth (the Curie isotherm). Starting with a model temperature profile based on seismology and heat flow constraints, they used the magnetic field observations to adjust the depth to this isotherm, then predicted the heat flux at the surface. Predictions for high heat flow were in excellent agreement with current active volcanic areas in the Antarctic.

Contact: Mike Purucker, GSFC, Code 921 (purucker@geomag.gsfc.nasa.gov)

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Responsible NASA official: Dr. Herbert Frey

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Last modified on January 16, 2004