"Just below the sun's corona lies the so-called magnetic canopy, a layer in which magnetic fields are aligned largely parallel to the solar surface. Just as the pitch of a strummed string increases with its tension, the frequency and propagation speed of the Alfvén wave increases with the strength of the magnetic field. The magnetic fields acting on the ionized particles of the plasma resemble a guitar string, whose playing triggers a wave motion. The new work of the Dresden team focuses on the so-called Alfvén waves that occur below the corona in the hot plasma of the solar atmosphere, which is permeated by magnetic fields. However, it remains controversial whether this effect is mainly due to a sudden change in magnetic field structures in the solar plasma or to the dampening of different types of waves. That magnetic fields play a dominant role in heating the sun's corona is now widely accepted in solar physics. ![]() For Stefani, the phenomenon of corona heating remains one of the great mysteries of solar physics, one that keeps running through his mind in the form of a very simple question: "Why is the pot warmer than the stove?" His team conducts research at the HZDR Institute of Fluid Dynamics on the physics of celestial bodies-including our central star. ![]() ![]() "It is all the more astonishing that temperatures of several million degrees suddenly prevail again in the overlying sun's corona," says Dr. At its surface, it emits its light at a comparatively moderate 6000 degrees Celsius. At 15 million degrees Celsius, the center of our sun is unimaginably hot.
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