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Solar Prominence

Bryce Atmosphere/Mood posted on Jan 10, 2010
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Description


Solar Prominence A solar prominence is a large bright feature extending outwards from the sun's surface, often in a loop configuration. Prominences are anchored to the solar surface in the photosphere, and extend outwards into the solar corona. While the corona consists of extremely hot ionized gases, known as plasma, which do not emit much visible light, prominences contain much cooler plasma, similar in composition to that of the chromosphere. A prominence forms over timescales of about a day, and stable prominences may persist in the corona for several months. Some prominences break apart and give rise to coronal mass ejections. Despite decades of study, the mechanism by which prominences form is not yet well understood. Theories have not satisfactorily explained how prominences can remain stable for such a long time when they are much denser than their surroundings. Magnetic fields are known to be the dominant influence on gas motions within the corona, but the exact form of magnetic interaction required to produce and maintain a large prominence has yet to be determined. A typical prominence extends over many thousands of kilometres; the largest observed by SOHO was seen in 1997 and was some 350,000 km (216,000 miles) long - some 28 times the diameter of the Earth. The mass contained within a prominence is typically of the order of 100 billion tonnes of material. If a solar prominence occurs on the disc of the sun it appears darker than it's background (due to the lower temperature of the plasma). These are refered to as solar filaments. Protubérance Solaire Une protubérance solaire est composée d'un plasma relativement froid, de l'ordre de 10 000 K (c-à-d une température du même ordre de grandeur que celle de la chromosphère du soleil) et dense, baignant dans la couronne bien plus chaude et ténue et confiné par le champ magnétique coronal. L'étude moderne des protubérances est particulièrement motivée par leur rôle dans les interactions soleil-terre. En effet, le plasma qui les compose est soutenu et confiné au-dessus de la surface solaire par le champ magnétique coronal, dont la géométrie varie continuellement au cours du temps. Lors de l'évolution du champ magnétique coronal, il arrive que la géométrie magnétique ne soit plus capable de confiner le plasma des protubérances. L'expulsion brutale du plasma produit alors des phénomènes éruptifs à grande échelle pouvant affecter l'environnement terrestre, en particulier notre magnétosphère. On appelle ces éruptions des éjections de masse coronale. Une éjection de masse coronale, souvent appelée CME (Coronal Mass Ejection en anglais), est une bulle de plasma produite dans la couronne du soleil. Elle est souvent liée à une éruption solaire ou à l'apparition d'une protubérance solaire, mais ce n'est pas systématique. Les CME sont des phénomènes à grande échelle : leur taille peut atteindre plusieurs dizaines de rayons solaires. Elles modifient les caractéristiques du vent solaire, se déplaçant à très grande vitesse dans le milieu interplanétaire (entre 100 km/s et 2 500 km/s) et peuvent parcourir la distance Terre-Soleil en quelques jours (typiquement trois jours). Le champ magnétique des CME est très fort : une CME atteignant la Terre peut donc provoquer des orages magnétiques en interagissant avec le champ magnétique terrestre. On observe alors des phénomènes de reconnexion magnétique et certaines lignes de champs peuvent s'ouvrir, affaiblissant ainsi le bouclier magnétique de la Terre. L'étude des CME joue donc un rôle clef dans la météorologie solaire. Thanks - Merci M a g i k

Comments (64)


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eekdog Online Now!

5:48PM | Sun, 10 January 2010

wöw ƒantastic ö. cool effects my friend.

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mickeyrony

5:57PM | Sun, 10 January 2010

Hummm ....It is rather hot. At least more than here. I like and thank you for the narration explanatory I in doubted me a little but me with a little less of narration .lol ..... ((5++) Hummm C'est assez chaud lol. Au moins plus que ici. J'aime bien et merci de la narration explicatives Je m'en doutait un peu mais moi avec un peu moin de narration .lol.....((5++)

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neoexcello

6:11PM | Sun, 10 January 2010

Image of terrific fantasy...beautiful and it gets the imagination dancing on it's toes.

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Faemike55

6:15PM | Sun, 10 January 2010

Fantastic effects and interesting information

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MOSKETON

6:25PM | Sun, 10 January 2010

REALMENTE FANTASTICO.

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shadownet

6:32PM | Sun, 10 January 2010

Well done!

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claude19

6:41PM | Sun, 10 January 2010

Parfait ! Bonne documentation ! Tu sais que depuis d&écembre 2009, le Soleil a retrouvé ses taches !!! Belle composition

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bmac62

6:43PM | Sun, 10 January 2010

Well done...render and scientific info go together very well.

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starfire777

6:45PM | Sun, 10 January 2010

Excellent image and colors!!!

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GreenHawke

7:00PM | Sun, 10 January 2010

Very good! I like science in art. Well, science IS art, right? Very, very good work, Magic! I salute your talents, Sir!

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tamburro

7:10PM | Sun, 10 January 2010

Excellent work, great effect and informations!!! Hugs Magik!!!!

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NefariousDrO

7:14PM | Sun, 10 January 2010

Beautiful stuff, great set of facts to go with it. A most wonderful scene.

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magnus073

7:17PM | Sun, 10 January 2010

La magie, c'est une image stupéfiante que vous avez créée. Vous êtes un grand enseignant mon ami. Vous m'avez enseigné une Proéminence Solaire et je crois que c'est fascinant.

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mgtcs

7:23PM | Sun, 10 January 2010

Another fabulous work my friend, gorgeous colors and superb POV!

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myrrhluz

7:40PM | Sun, 10 January 2010

I love the brighter lighting as it goes from the darker on the lower left to hte brighter on the upper right. Beautiful colors and textures. Terrific image!

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scifibabe

7:40PM | Sun, 10 January 2010

Very unique work - wonderful commentary also about solar prominences. Great effects and pov.

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anitalee

8:37PM | Sun, 10 January 2010

Great work

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jocko500

9:02PM | Sun, 10 January 2010

wonderful done

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amota99517

9:02PM | Sun, 10 January 2010

Outstanding representation of your narrative. I love it!

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kbrog

9:27PM | Sun, 10 January 2010

Fantastic work! Great little bit of infomation too.

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renecyberdoc

11:11PM | Sun, 10 January 2010

fantastic bro.

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lyron

11:12PM | Sun, 10 January 2010

Excellent work!!!

atlas7

11:52PM | Sun, 10 January 2010

Superbe vue et realisation !! 5+

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peedy

12:26AM | Mon, 11 January 2010

Way cool. Corrie

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Primal

12:31AM | Mon, 11 January 2010

Fire Good!!Excellent scene and info!Thanks!

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UteBigSmile

2:19AM | Mon, 11 January 2010

Your Info about this is very interesting! Hug's

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crys-laura

3:44AM | Mon, 11 January 2010

Great work!

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CarolSassy

7:49AM | Mon, 11 January 2010

A cool phenomena in a wonderful atmosphere! Nice one! (:

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miashadows

8:11AM | Mon, 11 January 2010

Stunning worK !!

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unstart

8:29AM | Mon, 11 January 2010

WOW..great depiction!


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