magnetic field tagged posts

The gravitational effects associated with the presence of the Moon and Sun cause cyclical deformation of the Earth’s mantle and wobbles in its rotation axis. This mechanical forcing applied to the whole planet causes strong currents in the outer core, which is made up of a liquid iron alloy of very low viscosity. Such currents are enough to generate the Earth’s magnetic field. Credit: © Julien Monteux and Denis Andrault

The Earth’s magnetic field permanently protects us from the charged particles and radiation that originate in the Sun. This shield is produced by the geodynamo, the rapid motion of huge quantities of liquid iron alloy in the Earth’s outer core...

Artist’s impression of a high critical temperature superconductor immersed in a magnetic field. The magnetic field generates whirls of current called vortices. These allow to better perceive an ordered electronic structure that coexists with the superconducting state. Credit: © UNIGE – Xavier Ravinet

New research shows electronic densities measured in these superconductors are a combination of 2 separate effects. As a result, a new model suggests the existence of 2 coexisting states, rather than competing ones as was postulated for the past 30 years. A small revolution in the world of superconductivity.

A superconducting material is a material that, below a certain temperature, loses all electrical resistance...

In this artist’s illustration, the young Sun-like star Kappa Ceti is blotched with large starspots, a sign of its high level of magnetic activity. New research shows that its stellar wind is 50 times stronger than our Sun’s. As a result, any Earth-like planet would need a magnetic field in order to protect its atmosphere and be habitable. The physical sizes of the star and planet and distance between them are not to scale. Credit: M. Weiss/CfA

Nearly 4B years ago, life arose on Earth. Life appeared because our planet had a rocky surface, liquid water, and a blanketing atmosphere. But life thrived thanks to another necessary ingredient: the presence of a protective magnetic field...

Sandia National Laboratories technician Eric Breden installs a transmission cable on the silver disk that is the new pulsed-power machine’s central powerflow assembly. Credit: Randy Montoya

A new Sandia National Laboratories accelerator called Thor is expected to be 40X more efficient than Sandia’s Z machine, the world’s largest and most powerful pulsed-power accelerator, in generating pressures to study materials under extreme conditions.”Thor’s magnetic field will reach about one million atmospheres, about the pressures at Earth’s core,” said David Reisman, lead theoretical physicist.

Though unable to match Z’s 5 million atmospheres, the completed Thor will be smaller—2,000 rather than 10,000 square feet—and will be considerably more efficient due to design improvements that use hundre...