Geodynamo, Solar Wind, and Magnetopause 3.4 to 3.45 Billion Years Ago-Reference-Cited by-同舟云学术

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

Published:2010-03-05 Issue:5970 Volume:327 Page:1238-1240
ISSN:0036-8075
Container-title:Science
language:en
Short-container-title:Science

Author:

Tarduno John A.¹²,Cottrell Rory D.¹,Watkeys Michael K.³,Hofmann Axel³,Doubrovine Pavel V.¹⁴,Mamajek Eric E.²,Liu Dunji⁵,Sibeck David G.⁶,Neukirch Levi P.²,Usui Yoichi¹⁷

Affiliation:

1. Department of Earth and Environmental Sciences, University of Rochester, Rochester, NY 14627, USA.

2. Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA.

3. School of Geological Sciences, University of KwaZulu-Natal, Durban 4000, South Africa.

4. Physics of Geological Processes, University of Oslo, Oslo 0316, Norway.

5. Beijing SHRIMP Centre, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, China.

6. Code 674, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA.

7. Department of Earth Sciences, Tohoku University, Sendai, Miyagi 980-8578, Japan.

Abstract

Early Origin of Earth's Magnetic Field Earth's magnetic field protects us from stellar winds and radiation from the Sun. Understanding when, during the Earth's formation, the large-scale magnetic field was established is important because it impacts understanding of the young Earth's atmosphere and exosphere. By analyzing ancient silicate crystals, Tarduno et al. (p. 1238 ; see the Perspective by

Jardine

) demonstrate that the Earth's magnetic field existed 3.4 to 3.45 billion years ago, pushing back the oldest record of geomagnetic field strength by 200 million years. This result combined with estimates of the conditions within the solar wind at that time implies that the size of the paleomagnetosphere was about half of that typical today, but with an auroral oval of about three times the area. The smaller magnetosphere and larger auroral oval would have promoted loss of volatiles and water from the early atmosphere.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Reference29 articles.

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5. Evidence for a 3.45-billion-year-old magnetic remanence: Hints of an ancient geodynamo from conglomerates of South Africa

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