510 Fun and Free Blog

You like science, don’t cha | July 16, 2010

7/17/10

UC Berkeley Campus
Genetics and Plant Biology Building, Room 100
Berkeley, CA
http://scienceatcal.berkeley.edu/lectures

Science@Cal is proud to present a series of free, public science lectures on the third Saturday of every month. These talks are given by renowned UC Berkeley scientists and aimed at general audiences.

Doors open thirty minutes before the talk and seating is on a first-come, first-served basis. Each talk is planned to last an hour, including time for at least a few questions at the end. Admission is free and no science background is required.

This Month’s Topic:
Prof. Bruce Buffett on “Planetary Magnetic Fields”.

“Many of the planets in the solar system have internally generated magnetic fields. All of these fields are produced by the motion of an electrically conducting fluid in the interior, although the details vary from planet to planet. Historical observations of the magnetic field on Earth show that the field is continually changing on time scales as short as a few years. Earth’s magnetic field also exhibits spontaneous polarity reversals, which cause the north and south magnetic poles to flip. The mechanism for reversals is not well understood, but geological records suggest that the onset of reversals is accompanied by a sudden reduction in the field strength. A strong field re-emerges from the interior as the new polarity is established. In this presentation I will discuss the origin of planetary magnetic fields. I will also speculate about the current decline in Earth’s field, which has prompted some researchers to suggest that the field is entering the next reversal.”

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1 Comment »

  1. tank you very much

    Comment by nice homes — July 18, 2010 @ 12:26 am


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