Access
To read this story in full you will need to login or make a payment (see right).
News and Views
Nature 446, 623-625 (5 April 2007) | doi:10.1038/446623a; Published online 4 April 2007
Open Innovation Challenges
-
Efficient Chromosome Doubling: Plant Cell Division
The Seeker is looking for an efficient chromosome doubling method in plants and in particular, metho...
-
Protect Enzyme from In Planta Degradation
A proposal for stable expression of an enzyme in corn seed is desired.
- More Challenges
- Powered by:
nature jobs
Faculty positions
- The University of Alabama at Birmingham
- Birmingham, Alabama, USA
Biochemist (Genetics / dna) Needed For Growing Nanostructure Designing Co. In Philadelphia
- KSR
- Blue Bell, PA, USA
Palaeomagnetism: A more ancient shield
David J. Dunlop1
Abstract
Earth's magnetic field has protected our atmosphere from erosion by the solar wind ever since it started up. Silicate crystals from some of Earth's oldest rocks date that event to more than 3 billion years ago.
Most planetary magnetic fields originate from the movement of electrically conducting fluid in the planet's interior: Earth's own magnetic dynamo lies deep in its hot, convecting core of liquid iron. The resulting global magnetic field protects Earth's atmosphere from depletion by the solar wind, a continuous, but highly variable, stream of charged particles ejected from the Sun.
- David J. Dunlop is in the Department of Physics, University of Toronto, Toronto, Ontario M5S 1A7, Canada.
Email: dunlop@physics.utoronto.ca
To read this story in full you will need to login or make a payment (see right).
MORE ARTICLES LIKE THIS
These links to content published by NPG are automatically generated.
RESEARCH
The structure of lactate dehydrogenase from Plasmodium falciparum reveals a new target for anti-malarial designNature Structural Biology Correspondence (01 Nov 1996)
Geomagnetic field strength 3.2 billion years ago recorded by single silicate crystalsNature Letters to Editor (05 Apr 2007)
Permanency of the ContinentsNature Article (22 Jan 1966)
Supplementary InformationNature Geoscience Letter (01 Jun 2008)
