The amount of radiation regularly reaching Earth from the sun 3. Andrews in Scotland. Astronomers might want to focus more on older, less active stars or search for planets with their own magnetic fields, she says. Despite the fact that no extrasolar planets with magnetic fields have ever been detected, Jardine and Tarduno remain optimistic.
Witze, A. Earth's ancient magnetic field just got a lot older. Nature Download citation. Published : 30 July Anyone you share the following link with will be able to read this content:. Sorry, a shareable link is not currently available for this article.
Provided by the Springer Nature SharedIt content-sharing initiative. Advanced search. Skip to main content Thank you for visiting nature. Download PDF. Subjects Geology Geophysics Planetary science. Early magnetism could have helped create conditions to support life.
Auroras are caused by the interaction of Earth's magnetic field with the solar wind. Credit: NASA. The magnetosphere protects Earth against the relentless solar wind. But scientists have had a hard time pinning down how long ago the magnetosphere first formed. They discovered that the magnetosphere was already in existence 3. These are geomagnetic observatories , typically part of a national Geological Survey , for example the British Geological Survey 's Eskdalemuir Observatory.
Such observatories can measure and forecast magnetic conditions that sometimes affect communications, electric power, and other human activities. See magnetic storm. The International Real-time Magnetic Observatory Network , with over interlinked geomagnetic observatories around the world has been recording the earths magnetic field since The military determines local geomagnetic field characteristics, in order to detect anomalies in the natural background that might be caused by a significant metallic object such as a submerged submarine.
Typically, these magnetic anomaly detectors are flown in aircraft like the UK 's Nimrod or towed as an instrument or an array of instruments from surface ships. Commercially, geophysical prospecting companies also use magnetic detectors to identify naturally occurring anomalies from ore bodies, such as the Kursk Magnetic Anomaly. Animals including birds and turtles can detect the Earth's magnetic field, and use the field to navigate during migration. Seismo-electromagnetics is an area of research aimed at earthquake prediction.
Licensed under the Creative Commons Attribution Non-commercial 3. Circuit diagram. See also: Solar wind. Main article: Geomagnetic reversal. McElhinney and W. Senanayake , J. Earth's Core and the Geodynamo. Science, vol.
DOI: Discovery News. Retrieved Eos Vol. Natural Resources Canada, Commonwealth of Australia, Australian Antarctic Division, Geochemistry Geophysics Geosystems 10 : Q09Z Science : PMID
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