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Wednesday, 22 November 2006 |
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Sabine Stanley of the University of Toronto presented this week’s DTM seminar: “A Study of Planetary Magnetic Field Morphologies.” Stanley and colleagues use numerical dynamo modeling to study planetary magnetic fields in our Solar System. Dynamo action is occurring in Earth, Jupiter, and Saturn, where it produces axially dipolar-dominated magnetic fields. Dynamo action generates non-dipolar, non-axisymmetric fields in Uranus and Neptune. Mars and the Moon have remanent magnetic fields, most likely from dynamo action in their pasts. Currently, data are insufficient from Mercury to distinguish between dynamo action and a remanent field.
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Friday, 17 November 2006 |
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Don Campbell of Cornell University delivered this week’s DTM seminar entitled, “The radar reflection properties of icy surfaces in the Solar System and the search for lunar ice.” Campbell presented an overview of radar astronomy and its application to the study of asteroids, the terrestrial planets and the icy satellites of the outer Solar System. Campbell highlighted his particular interest in testing for the presence of ice at the lunar poles, the subject of a 19 October 2006 article his and his colleagues published in Nature.
Photo courtesy Cornell University.
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Monday, 13 November 2006 |
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Former DTM staff member Alan Shapley, the first director of the National Geophysical Data Center (NGDC), passed away on October 20, 2006. Shapley was a staff member from 1942 to 1946, during which time he worked on the response of the ionosphere to geomagnetic disturbances.
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