Monday, February 14, 2022

Liquid metal experiment sheds light on solar corona conundrum

We still know so little even about the Sun! The sun is not a constant! Solar activity varies over time!

However, on a daily basis citizens of Western Countries and the rest of the world are inundated with the demagoguery of so called climate crisis/emergency (Global Warming hoax, Climate Change religion and similar pseudo science)! This is so medieval and huge pretense of knowledge!

"The centre of the Sun is incredibly hot, at 15 million degrees Celsius. Its surface is much cooler, at 6000 degrees. Then, in the outer reaches of its atmosphere, it becomes hotter again, with temperatures in the solar corona reaching several million degrees. This “corona heating”, as it is known, is one of greatest mysteries of solar physics. Current theories suggest that it stems from a “hot trail” that forms in the region just below the corona, where strong magnetic fields mean that plasma waves known as Alfvén waves can travel at the speed of sound. Direct evidence for this behaviour has, however, been lacking.

Researchers from the HZDR in Germany have now shed new light on this mystery by confirming the behaviour of Alfvén waves at high magnetic fields for the first time. Using the HZDR’s Dresden High Magnetic Field Laboratory, they showed that the speed of Alfvén waves within a sample of molten rubidium metal can indeed surpass the speed of sound, thus validating a key prediction from the “hot trail” theory. ..."

From the abstract:
"We report Alfvén-wave experiments with liquid rubidium at the Dresden High Magnetic Field Laboratory. Reaching up to 63 T, the pulsed magnetic field exceeds the critical value of 54 T at which the Alfvén speed coincides with the sound speed. At this threshold, we observe a period doubling of an applied 8 kHz cw excitation, which is consistent with the theoretical expectation of a parametric resonance between magnetosonic waves and Alfvén waves. Similar mode conversions are discussed as a possible mechanism for heating the solar corona."

Liquid metal experiment sheds light on solar corona conundrum – Physics World

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