The Battle For Earth's Atmosphere (page 2)
Image 1: The larger auroral oval relative to the modern is the result of a weaker dipole magnetic field and stronger solar wind dynamic pressure. The auroral intensity is brighter due to solar wind densities many times greater than those today, and the dominant color reflects greater energies of the precipitating particles and the mildly reducing Paleoarchean atmosphere. Credit: Courtesy J. Tarduno and R. Cottrell. University of RochesterImage 2: The Barberton Mountain Land, South Africa, is the site yielding data on the ancient magnetic field. Credit: University of Rochester
The Battle For Earth's Atmosphere
Image 1: The larger auroral oval relative to the modern is the result of a weaker dipole magnetic field and stronger solar wind dynamic pressure. The auroral intensity is brighter due to solar ...
Fri 5 Mar 10 from RedOrbit
Oldest measurement of Earth's magnetic field reveals battle between sun and Earth for our atmosphere
Scientists 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 strong wind of energetic particles ...
Thu 4 Mar 10 from ScienceDaily
Oldest measurement of Earth's magnetic field reveals battle between sun and Earth for our atmosphere, Thu 4 Mar 10 from e! Science News
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