Breakthrough in identifying the puzzling cause. Researchers discovered a previously unknown heating mechanism that explains why the 'solar corona,' the atmosphere surrounding the Sun, is much hotter than the solar surface that emits it. The finding at the Princeton Plasma Physics Laboratory (PP
has the potential to help resolve several astrophysical mysteries, including star formation, the source of large-scale magnetic fields in the universe, and the prediction of space weather events that can cause cell phone outages and power grid failures on Earth. Understanding the heating process also has significant implications for fusion energy research.
When the reconnection process is slow while the turbulent cascade is fast, reconnection cannot affect the transfer of energy across scales, he said. But when the reconnection rate becomes fast enough to exceed the traditional cascade rate, reconnection can move the cascade toward small scales more efficiently.
The new discovery demonstrates a regime with an unprecedentedly large magnetic Reynolds number as in the solar corona. The large number characterizes the new high energy transfer rate of the turbulent cascade. “The higher the magnetic Reynolds number is, the more efficient the reconnection-driven energy transfer is,” said Dong, who is moving to Boston University to take up a faculty position.
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