Eruption de filament solaire
Qu'arrive-t-il au Soleil ? Rien de très spécial. Il a juste
éjecté un filament. À la fin du mois d'août,
un filament solaire est soudainement entré en éruption, entrainant une éjection de matière coronale.
Ce filament avait été maintenu en lévitation pendant plusieurs jours par le
champ magnétique solaire.
Observée attentivement par le satellite SDO, cette
éruption a
déversé moult ions et électrons dans le système solaire, dont certains sont entrés en collision avec la
magnétosphère terrestre trois jours plus tard, engendrant des
aurores polaires. Les boucles de plasma environnant cette
région active sont visibles sur cette
image en ultraviolet au-dessus du filament. Si vous avez raté
les aurores, ne désespérez pas : d'ici deux ans, le Soleil connaitra son
maximum d'activité ce qui promet de nouvelles
éjections de matière coronale, et donc plus d'aurores.
L'image d'astronomie du jour (Astronomy Picture Of the Day - APOD)
Traduction réalisée par Didier Jamet
D'autres images d'astronomie...
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On August 31, the Sun threw a major tantrum. It started with a vast arc of material towering over its surface, a stream of plasma flowing between two sunspots. Sometimes these collapse back down to the Sun’s surface, but this one exploded, blasting hundreds of millions of tons of material out into space. SDO captured …
blogs.discovermagazine.com
solar-center.stanford.edu 
en.wikipedia.org 
spaceweather.com 
solar.physics.montana.edu 