Geodynamo, Solar Wind, and Magnetopause 3.4 to 3.45 Billion Years Ago

Details Geodynamo, Solar Wind, and Magnetopause 3.4 to 3.45 Billion Years Ago Geodynamo, Solar Wind, and Magnetopause 3.4 to 3.45 Billion Years Ago

Mar 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010sci...327.1238t&link_type=abstract

Science, Volume 327, Issue 5970, pp. 1238- (2010).

Computer Science

17

Scientific paper

Stellar wind standoff by a planetary magnetic field prevents atmospheric erosion and water loss. Although the early Earth retained its water and atmosphere, and thus evolved as a habitable planet, little is known about Earth’s magnetic field strength during that time. We report paleointensity results from single silicate crystals bearing magnetic inclusions that record a geodynamo 3.4 to 3.45 billion years ago. The measured field strength is ~50 to 70% that of the present-day field. When combined with a greater Paleoarchean solar wind pressure, the paleofield strength data suggest steady-state magnetopause standoff distances of ≤5 Earth radii, similar to values observed during recent coronal mass ejection events. The data also suggest lower-latitude aurora and increases in polar cap area, as well as heating, expansion, and volatile loss from the exosphere that would have affected long-term atmospheric composition.

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