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posted by janrinok on Saturday March 10 2018, @10:32AM   Printer-friendly
from the I-though-this-had-been-happening-for-a-lot-longer dept.

The Sun is the source of energy that sustains all life on Earth but much remains unknown about it. However, a group of researchers at Queen's [Ed: Queen's University Belfast] have now unlocked some mysteries in a research paper, which has been published in Nature Physics.

In 1942, Swedish physicist and engineer Hannes Alfvén predicted the existence of a new type of wave due to magnetism acting on a plasma, which led him to obtain the Nobel Prize for Physics in 1970. Since his prediction, Alfvén waves have been associated with a variety of sources, including nuclear reactors, the gas cloud that envelops comets, laboratory experiments, medical MRI imaging and in the atmosphere of our nearest star -- the Sun.

Scientists have suggested for many years that these waves may play an important role in maintaining the Sun's extremely high temperatures but until now had not been able to prove it.

Dr David Jess from the School of Mathematics and Physics at Queen's University Belfast explains: "For a long time scientists across the globe have predicted that Alfvén waves travel upwards from the solar surface to break in the higher layers, releasing enormous amounts of energy in the form of heat. Over the last decade scientists have been able to prove that the waves exist but until now there was no direct evidence that they had the capability to convert their movement into heat.

"At Queen's, we have now led a team to detect and pinpoint the heat produced by Alfvén waves in a sunspot. This theory was predicted some 75 years ago but we now have the proof for the very first time. Our research opens up a new window to understanding how this phenomenon could potentially work in other areas such as energy reactors and medical devices."

[...] Dr Samuel Grant from Queen's comments: "By breaking the Sun's light up into its constituent colours, our international team of researchers were able to examine the behaviour of certain elements from the periodic table within the Sun's atmosphere, including calcium and iron.

"Once these elements had been extracted, intense flashes of light were detected in the image sequences. These intense flashes had all the hallmarks of the Alfvén waves converting their energy into shock waves, in a similar way to a supersonic aircraft creating a boom as it exceeds the speed of sound. The shock waves then ripple through the surrounding plasma, producing extreme heat. Using supercomputers, we were able to analyse the data and show for the first time in history that the Alfvén waves were capable of increasing plasma temperatures violently above their calm background."


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  • (Score: 0) by Anonymous Coward on Saturday March 10 2018, @02:59PM (1 child)

    by Anonymous Coward on Saturday March 10 2018, @02:59PM (#650520)

    I wonder if it can be used to explain why the corona is so damn hot. While the surface of the sun (photosphere) is only about 5800 K, the corona is much much hotter, in the 1-3 million kelvin range. There is considerable debate as to why this is so.

  • (Score: 4, Interesting) by fraxinus-tree on Saturday March 10 2018, @04:27PM

    by fraxinus-tree (5590) on Saturday March 10 2018, @04:27PM (#650544)

    TFA (the original one in The Nature, not the one linked) is actually about the corona. How the lower layers are heated was more or less known beforehand.