Le maximum solaire est-il passé ?
Qu'est-il arrivé au Soleil ? Rien de très spécial. Il a juste
éjecté un filament. À la fin du mois d'août 2012,
un filament solaire est soudainement entré en éruption, provoquant une éjection de matière coronale.
Ce filament avait été maintenu en lévitation pendant plusieurs jours par
le champ magnétique solaire, et le déclenchement soudain de l'éruption avait été assez inattendu.
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. Ces dernières semaines, le nombre de taches visibles à la surface du Soleil est
tombé quasiment à zéro, ce qui pourrait signifier que
le Soleil a déjà passé le cap d'un assez inhabituel
maximum d'activité de son
cycle de onze ans.
L'image d'astronomie du jour (Astronomy Picture Of the Day - APOD)
Traduction réalisée par Didier Jamet
D'autres images d'astronomie...
Ailleurs sur le web
August 31 CME
On August 31, 2012 a long filament of solar material that had been hovering in the sun's atmosphere, the corona, erupted out into space at 4:36 p.m. EDT. The coronal mass ejection, or CME, traveled at over 900 miles per second. The CME did not travel directly toward Earth, but did connect with Earth's magnetic environment, or magnetosphere, causing aurora to appear on the night of Monday [...]
www.flickr.com
Magnificent CME Erupts on the Sun - August 31
Solar Flare Extremely energetic objects permeate the universe. But close to home, the sun produces its own dazzling lightshow, producing the largest explosions in our solar system and driving powerful solar storms.. When solar activity contorts and realigns the sun’s magnetic fields, vast amounts of energy can be driven into space. This phenomenon can create a sudden flash of light—a solar fla [...]
www.flickr.com
Magnificent CME Erupts on the Sun - August 31 [video]
On August 31, 2012 a long filament of solar material that had been hovering in the sun's atmosphere, the corona, erupted out into space at 4:36 p.m. EDT. The coronal mass ejection, or CME, traveled at over 900 miles per second. The CME did not travel directly toward Earth, but did connect with Earth's magnetic environment, or magnetosphere, causing aurora to appear on the night of Monday, Septembe [...]
www.flickr.com
Magnificent CME Erupts on the Sun [HD VIDEO]
To download this video file go to: svs.gsfc.nasa.gov/goto?11095 On August 31, 2012 a long filament of solar material that had been hovering in the sun's atmosphere, the corona, erupted out into space at 4:36 p.m. EDT. The coronal mass ejection, or CME, traveled at over 900 miles per second. The CME did not travel directly toward Earth, but did connect with Earth's magnetic environment, or magnet [...]
www.flickr.com
A HUGE solar filament erupts into space - Bad Astronomy
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
The K7RA Solar Update
The American Radio Relay League (ARRL) is the national association for amateur radio, connecting hams around the U.S. with news, information and resources.
www.arrl.org
solar-center.stanford.edu 
en.wikipedia.org 
fr.wikipedia.org 
spaceweather.com 
solar.physics.montana.edu 
