Geodynamo, solar wind, and magnetopause 3.4 to 3.45 billion years ago.

@article{Tarduno2010GeodynamoSW,
  title={Geodynamo, solar wind, and magnetopause 3.4 to 3.45 billion years ago.},
  author={John A. Tarduno and Rory D Cottrell and Michael K. Watkeys and Axel Hofmann and Pavel V Doubrovine and Eric E. Mamajek and Dunji Liu and David G. Sibeck and Levi P. Neukirch and Yoichi Usui},
  journal={Science},
  year={2010},
  volume={327 5970},
  pages={
          1238-40
        }
}
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 approximately 50 to 70% that of the present-day field… CONTINUE READING

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