Piercing Solar Physics Mysteries: Supercomputer Simulations Illuminate the Sun’s Magnetic Dynamo — Scientists have used advan |
Nature Astronomy
Scientists have used advanced supercomputer simulations to demonstrate the existence and significance of a small-scale dynamo in the Sun’s magnetic field. This discovery refutes previous assumptions and advances our understanding of solar dynamics, potentially enabling earlier predictions of major solar events.known as coronal mass ejections out into the solar system. Sometimes these hit Earth, where they can knock out power grids and damage satellites.
In the new study, scientists at Aalto University and the Max Planck Institute for Solar System Research tackled the small-scale dynamo question by running massive computer simulations on petascale supercomputers in Finland and Germany. The joint computing power enabled the team to directly simulate whether the Sun could have a small-scale dynamo.
Some previous studies have suggested that the small-scale dynamo might not work under the conditions found in stars like the Sun, which have a very low magnetic Prandtl number , a measure used in fluid and plasma physics to compare how quickly variations in the magnetic field and velocities even out. Korpi-Lagg’s research team modeled conditions of turbulence with unprecedentedly low PrM values and found that, contrary to what has been thought, a small-scale dynamo can occur at such low values.
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