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28 juin 2020

It's watching the Sun and finding comets. Lots of comets

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A joint-venture between NASA and the European Space Agency, SOHO is looking at the Sun, in part via the onboard Large Angle Spectrometric Coronagraph (LASCO) instrument. The comet watching is done largely by citizen scientists through the Sungrazer project, and they’ve now discovered well over half of all known comets.

Writing in the journal Science, a team led by Laurent Gizon (S 1994-PHD Stanford) from the Max Planck Institute for Solar System Research describes its use of helioseismology – probing the Sun’s interior with acoustic oscillations, much as seismology uses of earthquakes to investigate Earth’s interior.

“Seeing the geometry and the amplitude of motions in the solar interior is essential to understanding the Sun’s magnetic field,” Gizon says.

Photo : Credit: MPS / Z-C Liang

27 June 2020 / Cosmos 

Motions in the Sun reveal inner workings of Sunspot cycle

“Over the course of a solar cycle, the meridional flow acts as a conveyor belt that drags the magnetic field along and sets the period of the solar cycle,” says Prof. Dr. Laurent Gizon (S 1994-PHD Stanford) MPS Director and first author of the new study. To this end, Gizon and his team used helioseismology to map the plasma flow below the Sun’s surface.

In this study, Gizon and his team used observations of sound waves at the surface that propagate in the north-south direction through the solar interior. 

“The meridional flow is much slower than other components of motion, such as the Sun’s differential rotation,” Gizon explains. 
“It remains to be understood why the solar meridional flow looks like it does, and what role the meridional flow plays in controlling magnetic activity on other stars” adds Laurent Gizon.

Extracts of bignewsnetwork ANI By James M. Patterson - June 26, 2020



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