Early Earth's Magnetic Field Was a Weakling
Continuing my earlier geomagnetism blurt: University of Rochester geophysicist John Tarduno and an international team measured the magnetization of nanometer-sized magnetic inclusions, isolated within millimeter-sized quartz crystal inclusions, within 3.5 billion year old South African igneous rocks called dacites using a new, super-sensitive superconducting quantum interface device, or SQUID magnetometer. read more
Early Earth's Magnetic Field Was a Weakling
Early Earth's magnetic field weaker than today, likely led to water loss from atmosphere, bigger auroras.
Fri 5 Mar 10 from SPACE.com
Oldest measurement of Earth's magnetic field reveals battle between Sun and Earth for our atmosphere
Scientists at the University of Rochester have discovered that the Earth's magnetic field 3.5 billion years ago was only half as strong as it is today, and that this weakness, coupled with a ...
Thu 4 Mar 10 from PhysOrg
Featured - Oldest measurement of Earth's magnetic field reveals battle between sun and Earth, Fri 5 Mar 10 from Labspaces.net
Earth’s Magnetic Field Is 3.5 Billion Years Old
Evidence for the existence of Earth's magnetic field has been pushed back about 250 million years, new research suggests. The field may therefore be old enough to have shielded some of the planet’s ...
Fri 5 Mar 10 from Wired Science
Geophysicists Push Age of Earth's Magnetic Field Back 250 Million Years
Planetary shield formed soon enough to protect early life forms from harmful solar radiation.
Thu 4 Mar 10 from U.S. News
Geophysicists push age of Earth's magnetic field back 250 million years, Thu 4 Mar 10 from ScienceNews
Earth's Weaker Paleoarchean Magnetism
Continuing my earlier geomagnetism blurt: University of Rochester geophysicist John Tarduno and an international team measured the magnetization of nanometer-sized magnetic inclusions, ...
Sat 6 Mar 10 from Scientific Blogging
Earth Raised up Its Magnetic Shield Early, Protecting Water and Emerging Life
Here we are drinking coffee and tweeting and otherwise going about our ...
Fri 5 Mar 10 from Discover Magazine
Battle Between Sun And Earth For Our Atmosphere
Rochester NY (SPX) Mar 08, 2010 - Scientists at the University of Rochester have discovered that the Earth's magnetic field 3.5 billion years ago was only half as strong as it is today, and ...
Sun 7 Mar 10 from SpaceDaily
Oldest measurement of Earth's magnetic field reveals battle between sun and Earth
According to findings by Univ. of Rochester researchers who visited sites in Africa known to contain extremely old rocks, the Earth's magnetic field 3.5 billion years ago was only half as strong ...
Fri 5 Mar 10 from R&D Mag
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