CLICK HERE for full report.Yahoo! News wrote:A paper, published in the journal Proceedings of the National Academy of Sciences, describes how a team of scientists detected a new type of magnetic wave that sweeps across the ‘surface’ of Earth’s outer core – so where the core meets the mantle.
This mysterious wave oscillates every seven years and propagates westward at up to 900 miles year.
Owing to Earth’s rotation, these waves align in columns along the axis of rotation. The motion and magnetic field changes associated with these waves are strongest near the equatorial region of the core.
While the research exhibits magneto-Coriolis waves near a seven-year period, the question of the existence of such waves that would oscillate at different periods, however, remains.
Dr Gillet added: “Magnetic waves are likely to be triggered by disturbances deep within the Earth's fluid core, possibly related to buoyancy plumes.
“Each wave is specified by its period and typical length-scale, and the period depends on characteristics of the forces at play. For magneto-Coriolis waves, the period is indicative of the intensity of the magnetic field within the core.
“Our research suggests that other such waves are likely to exist, probably with longer periods – but their discovery relies on more research.”
One for Rory Duff?