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Evidence was found for a magnetic reconnection that produces spicules on the Sun.



  Indications of a magnetic reconnection that generates spicules on the Sun
The background image is a coronal image in the 17.1 nm transmission range recorded by the AIA instrument aboard the SDO spacecraft. The superposed slices show the photospheric magnetic field as well as the emission of the photosphere, chromosphere and corona in the area indicated by the black box. Picture credits: T. Samanta, GST & SDO

An international research team has found evidence that magnetic reconnection is the source of spicule formation on the solar surface. In their article, published in the journal Science the group describes their study of the sun and what they have learned about it.

Scientists have been aware of the generation of spicules on the Sun's surface since 1877, but despite much research, their origins have remained a mystery. With this new effort, the researchers believe they have finally found the answer thanks to the Goode solar telescope. a new, very high resolution solar telescope.

Spicules are small rays of solar plasma that erupt on the entire solar surface. Each lasts only a few minutes, which makes it very difficult to study. Solar scientists have been wondering for some time if they may have the key to the mystery of why the sun's corona is so much hotter than its surface. To find some possible answers, the researchers used the Goode Solar Telescope to look at them in the best possible way. They found something that had not been observed before – just before a spicule erupted, a spot formed on the surface of the sun at the same point where a magnetic field reversed from its surroundings. Such a finding suggested that, due to the magnetic reconnection, spicules could form in which collisions occur between regions of oppositely disposed magnetic field lines. In such collisions, magnetic energy is converted into kinetic energy and heat. On the sun, heat and energy could be responsible for the formation of spicules.






Image sequence (from bottom to top) showing the photospheric magnetic field as well as the emission of the photosphere, chromosphere and corona. Credit: T. Samanta, GST & SDO

The researchers turned to Solar Dynamics Observatory (Earth) data to find out if spicule eruptions are part or all of the reason that the corona is so much hotter than that Surface is -orbitierender satellite with solar observation equipment. When comparing data from the Goode telescope that showed the same part of the Sun at the same time, the spiculum to be examined broke out – the researchers observed a glow of charged iron atoms that occurred just above the spiculum position. They note that such a glow indicates that the plasma in the spiculum has reached at least a temperature of 1 million degrees Celsius.






Summary of our results using observations from the BBSO / GST and SDO / AIA telescopes. Picture credits: T. Samanta, GST & SDO

Mix-Master: Modeling the magnetic reconnection in partially ionized plasma


Further information:
Tanmoy Samanta et al. Generation of Soluble Bubbles and Subsequent Atmospheric Warming, Science (2019). DOI: 10.1126 / science.aaw2796, science.sciencemag.org/content/366/6467/890

Press release

© 2019 Science X Network

Quote :
Indications of magnetic reconnection to the generation of spicules found in the sun (2019, November 15)
retrieved on November 16, 2019
from https://phys.org/news/2019-11-evidence-magnetic-reconnection-spicules-sun.html

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