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Soleil / Sun

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This photo shows the Sun's power in exquisite detail. From 93 million miles away, we earthlings are blissfully unaware of the sheer magnitude of powerful activity roiling on the the sun’s surface.

This photo shows the Sun's power in exquisite detail

But thanks to NASA’s Solar Dynamics Observatory (SDO) spacecraft, which has been snapping pictures of the sun for the last five years, we can see this massive monster in action, like in the SDO image below: What you’re seeing is a representation of The sun’s magnetic field is constantly changing unlike Earth’s, which means it’s growing and shrinking in strength. Sometimes it can swell to be thousands of times stronger than Earth’s. When that happens, it generates black blemishes called sun spots, as shown in the image below: If we go back to the first image, what you’re seeing are two giant sunspots in blue and yellow. The blue and yellow are false colours — in reality, the sunspots are black. But these false colours serve an important purpose: The magnetic field of the sunspot in blue has an opposite charge from the sunspot in yellow.

(2) Twitter. A timelapse of the Sun in 4K. Project. Modélisation 3D du soleil. Illustration: CEA Modélisation 3D du Soleil: de son cœur à sa surface Une équipe du laboratoire Astrophysique Instrumentation & Modélisation (CEA/CNRS/Université Paris Diderot) a réussi à modéliser les effets d'ondes de gravité dans une simulation du Soleil (Le Soleil (Sol en latin, Helios ou Ήλιος en grec) est l'étoile centrale du système solaire.

Modélisation 3D du soleil

Dans la classification astronomique, c'est une étoile de type naine jaune, et...) extrêmement complète, de son cœur nucléaire (Le terme d'énergie nucléaire recouvre deux sens selon le contexte :) à sa surface (Une surface désigne généralement la couche superficielle d'un objet. Le terme a plusieurs acceptions, parfois objet géométrique, parfois frontière physique, et est souvent abusivement confondu avec sa mesure,...) convective, et ce en 3 dimensions (Dans le sens commun, la notion de dimension renvoie à la taille ; les dimensions d'une pièce sont sa longueur, sa largeur et sa profondeur/son...).

Looking In The Sun's Rear-View Mirror: A New Map Of The Local Interstellar Medium.

Cycles solaires

Groupement Français pour l'Observation et l'Etude du Soleil. Alan Friedman’s Astonishing HD Photographs of the Sun Shot from his Own Backyard. Alan Friedman is a fascinating guy.

Alan Friedman’s Astonishing HD Photographs of the Sun Shot from his Own Backyard

By day he’s a maker of greeting cards and a lover of hats, but in his spare time he’s a self-proclaimed space cowboy who points a telescope skyward from his backyard in downtown Buffalo, directly into the light of the sun. Using special filters attached to his camera Friedman captures some of the most lovely details of the Sun’s roiling surface. The raw images are colorless and often blurry requiring numerous hours of coloring, adjusting and finessing to tease out the finest details, the results of which hardly resemble what I imagine the 5,500 degree (Celsius) surface of Sun might look like. Instead Friedman’s photos appear almost calm and serene, perhaps an entire planet of fluffy clouds or cotton candy. La NASA dévoile les multiples visages du Soleil grâce à la sonde SDO. Solar loop. NASA SDO - Today's Sun; September 11, 2012. Www.solarastronomy.org where the Sun always shines! SDO Data - Solar Dynamics Observatory.

Galerie de sdomission. STEREO. SIDC - Solar Influences Data Center. Helioviewer.org - Solar and heliospheric image visualization tool.

Actu solaire - live

Eclipses. Eruptions solaires / CME. Solar Flares: What Does It Take to Be X-Class? Sun Unleashes X6.9 Class Flare. Sun Unleashes X6.9 Class Flare On August 9, 2011 at 3:48 a.m.

Sun Unleashes X6.9 Class Flare

EDT, the sun emitted an Earth-directed X6.9 flare, as measured by the NOAA GOES satellite. These gigantic bursts of radiation cannot pass through Earth's atmosphere to harm humans on the ground, however they can disrupt the atmosphere and disrupt GPS and communications signals. In this case, it appears the flare is strong enough to potentially cause some radio communication blackouts. It also produced increased solar energetic proton radiation -- enough to affect humans in space if they do not protect themselves.

There was also a coronal mass ejection (CME) associated with this flare. Updates will be forthcoming if needed. Solar Stormwatch. Space Weather Now. Le Soleil - SpaceWeather live. Real-time plots auroral activity Welcome on SpaceWeatherLive! Below you will find the status of the solar wind and the Interplanetary Magnetic Field (IMF) from the past two hours as measured by the ACE spacecraft. These parameters are the first parameters used to predict auroral activity. The redder the plots get, the better it is for auroral activity! News and information about meteor showers, solar flares, auroras, and near-Earth asteroids.

SOLARCYCLE 24.com / SolarHam.com / Solar Cycle 24 / Spaceweather / Amateur Radio VHF Aurora Website. iNtegrated Space Weather Analysis System ( iSWA ) : iswa3 : Version 1.9.5 [Prepared Wormhole]

Aurores boréales

SunCalc - sun position, sunlight phases, sunrise, sunset, dusk and dawn times calculator. SunCalc is a little app that shows sun movement and sunlight phases during the given day at the given location.

SunCalc - sun position, sunlight phases, sunrise, sunset, dusk and dawn times calculator

You can see sun positions at sunrise, specified time and sunset. The thin orange curve is the current sun trajectory, and the yellow area around is the variation of sun trajectories during the year. The closer a point is to the center, the higher is the sun above the horizon. The colors on the time slider above show sunlight coverage during the day. Please leave your ideas about improving SunCalc or vote for them here, and follow @suncalc_net for updates. 3D Sun for your iPhone and iPod Touch. Sun Moon Scope. Astronomy Picture of the Day. Discover the cosmos!

Astronomy Picture of the Day

Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. 2015 January 3 Apollo 17: A Stereo View from Lunar Orbit Image Credit: Gene Cernan, Apollo 17, NASA; Anaglyph by Patrick Vantuyne Explanation: Get out your red/blue glasses and check out this awesome stereo view of another world. The scene was recorded by Apollo 17 mission commander Eugene Cernan on December 11, 1972, one orbit before descending to land on the Moon.

Au travers d’un tunnel du Soleil. Aujourd’hui le soleil s’est arrêté.

Au travers d’un tunnel du Soleil

C’est, littéralement, la définition du solstice. Différentes façons de voir le soleil. Amazingly Detailed Photo of the Surface of the Sun. A quoi ressemble le Soleil vu depuis Pluton. En se basant sur des données recueillies par l’ESO (European Southern Observatory), les scientifiques ont réussi à donner une idée (et même une image) de ce à quoi ressemble une belle matinée ensoleillée sur Pluton. Pluton est situé 40 fois plus loin du Soleil que la Terre. Du coup, depuis cette planète naine qui ne représente qu’un cinquième de la Terre, la lumière solaire paraît 1.000 fois plus faible. De plus, cette planète naine est couverte de plaques de méthane gelé et d’une atmosphère brumeuse dans laquelle flotte le méthane gazeux.

Soit des conditions qui diffèrent largement de celles que l'on peut connaitre sur Terre. Avez-vous déjà partagé cet article? Mercredis scientifiques @ATLAS Saint-Ouen.