Paleointensity, solar wind and magnetopause 3.45 billion years ago (Invited)

Details Paleointensity, solar wind and magnetopause 3.45 billion years ago (Invited) Paleointensity, solar wind and magnetopause 3.45 billion years ago (Invited)

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmgp33b..07t&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #GP33B-07

Mathematics

Logic

[1521] Geomagnetism And Paleomagnetism / Paleointensity, [1540] Geomagnetism And Paleomagnetism / Rock And Mineral Magnetism, [9623] Information Related To Geologic Time / Archean

Scientific paper

The standoff of the solar wind by the magnetic field produced by a core dynamo defines atmospheric shielding and prevention of volatile loss important for the evolution of a habitable planet. Yet little is known about magnetic field strength for the earliest Earth. Therefore, the potential for intense radiation from the young, rapidly rotating Sun modifying the atmosphere is uncertain. We report Thellier paleointensity results from single silicate crystals bearing magnetic inclusions that indicate the presence of a Paleoarchean geodynamo between 3.40 and 3.45 billion years ago. The field is somewhat weaker than the current field and when combined with the a greater solar wind pressure suggest steady-state Paleoarchean magnetopause standoff distances similar to those observed during recent solar storms. We will discuss efforts to further extend the paleointensity record, using single crystals with magnetic inclusions, such as zircons, eroded from older igneous rocks and now found within Archean sedimentary units.

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