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26 novembre 2013 2 26 /11 /novembre /2013 14:14

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Gérard 27/11/2013 01:25


Salut à toi Damien,


Visiblement Ison ne s'est pas encore disloquée à la distance quasiment la plus proche du soleil.


 


Rappelez vous d'elenin, on avait beaucoup spéculé dessus et résultat, elle s'est rétamée.


On va attendre et puis on verra bien.


 


Merci à toi Damien.


Une bonne nuit à toi.


 


Bonjour chez toi.


Gérard

Ferlinpimpim 27/11/2013 10:53



Salut gérard, il n'y a aucun catastrophisme en vue, juste Ison visible sur les images solaires et bientôt dans le ciel, je l'espère....



yannem 26/11/2013 21:09


salute,


quelque chose d'inquiétant?

Ferlinpimpim 27/11/2013 10:50



Salut, non, c'est une comète.... Peut-être très visible en début de mois prochain depuis la Terre....



Lef"s 26/11/2013 18:49


Bonjour


Je pense que Helios voulais parler de ce qui ce trouve a droite de Dschubba. Effectivement c'est quoi?


http://sohowww.nascom.nasa.gov/data/realtime/c3/512/

Ferlinpimpim 26/11/2013 20:37



Bonsoir, non, ce n'est pas Ison. C'est sur deux images, mais pas sur celle d'avant ( 16h06 )....



neo 26/11/2013 16:06


http://earthsky.org/space/big-sun-diving-comet-ison-might-be-spectacular-in-2013?utm_source=EarthSky+News&utm_campaign=045d3fb0e0-EarthSky_News&utm_medium=email&utm_term=0_c643945d79-045d3fb0e0-393511181


 


By Deborah Byrd in
Blogs | Human World | Space on Nov 26, 2013








Is Comet ISON disintegrating?








View larger. | ISON on Nov. 19 by Greg Hogan











There’s evidence that Comet ISON may be disintegrating, as it hurtles toward the sun’s intense heat. If so, bummer. But the verdict isn’t in.


















Comets ISON (brighter) and Encke from November 19-22, 2013 as seen encountering the solar wind. Image via NASA.





Here is Comet ISON Monday morning, November 25. It will encounter the sun on November 28 – Thanksgiving Day in the U.S. Will it survive?



NOVEMBER 25, 2013. There has talk for some days about whether Comet ISON has fragmented. The sungrazing comet experts were saying no, but Monday morning Karl Battams – one of
the great communicators at NASA’s Comet ISON Observing Campaign website – said that something is happening to the
comet. There are signs it may be fragmenting. He wrote:



There’s evidence that ISON’s nucleus might not be holding up well (by which I mean falling apart!) It was always a possibility…we’ll see!



Later, he added:



It is absolutely conceivable that ISON remains in one piece, and is just being a sungrazer.



In other words, the word isn’t in yet on whether ISON is still intact.


The evidence for ISON’s possible disintegration comes in the form of a rapid drop in emissions, in recent days, from a certain kind of molecule (hydrogen cyanide molecule) known to be embedded
in cometary ice. At his Bad Astronomy blog on Slate, Phil Plait
explained that it’s the ice of a comet like ISON that holds the comet together. ISON is full of fresh ice. It’s a first-time visitor from the Oort comet cloud surrounding our solar system. If
enough ice boils off the comet as it gets closer to the sun, the comet will literally fall apart.


But how much ice has ISON lost? Enough so that the comet will fall apart? Meanwhile, dust has also been observed to be pouring from the comet. These signs could mean that ISON’s
nucleus has completely disrupted. Or not.


Why don’t astronomers know what will happen? Karl Battams explained:



… these reports are new, and while they are undoubtedly valid, we do still need to keep observing the comet to be sure what it happening. Remember: Comet ISON is a dynamically new sungrazing
comet, fresh in from the Oort Cloud, and the last time we saw an object like this was never! Furthermore, a sungrazing comet just three days from perihelion has never been
studied in this kind of detail – we’re breaking new ground here! When we factor in your standard ‘comets are unpredictable’ disclaimer, what we have is a huge recipe for the unknown.



We do know that, after traveling at least a million years from the Oort Cloud, Comet ISON is now plummeting fast toward the sun. Its perihelion or closest point to the sun will be on November 28 – Thanksgiving Day in the U.S. At perihelion, the
comet will be traveling at 248 miles per second, encountering solar temperatures of up to 5,000 degrees Fahrenheit.


Thus this week will bring Comet ISON’s moment of truth, its day of reckoning. The comet is close to the sun on our sky’s dome now and won’t be seen from Earth this week except, perhaps, by a
few experienced observers. However, NASA and ESA’s fleet
of sun-observing spacecraft will be watching it.


If it survives its passage near the sun, Comet ISON will return to our skies in early December, and, indeed, early December may be the best time to try to see the comet … if there is a comet
left to see.


Follow the links below below for a Comet ISON viewing schedule and other information.



Comet ISON month-by-month in late 2013.


Why might Comet ISON fragment when closest to the sun?



How bright will Comet ISON be later this year? How long will its tail be?



Who discovered Comet ISON?



What’s the story on Comet ISON’s August 2013 recovery and brightness?



Will Comet ISON live up to expectations?


Best photos, images, videos of Comet ISON




Comets Encke and ISON on November 25, 2013.





neo 26/11/2013 15:44


http://www.space.com/23715-comet-ison-thanksgiving-sun-encounter-science.html?cmpid=555137


 




Comet ISON's Close Sun Encounter This Week Has Scientists Fired Up



By Mike Wall, Senior Writer   |   November 24, 2013 09:30am ET




       
















Comet ISON shines brightly in this image taken on the morning of Nov. 19, 2013. This is a 10-second exposure taken with the Marshall Space Flight Center 20" telescope in New Mexico. The
camera there is black and white, but the smaller field of view allows for a better "zoom in" on the comet's coma, which is essentially the head of the comet.
Credit: NASA/MSFC/MEO/Cameron McCarty

View full size image






The promising Comet ISON's close pass by the sun this week has amateur astronomers on the edge of their seats, but professional
scientists are anticipating the celestial encounter with perhaps even greater relish.


Comet ISON is set to
skim just 730,000 miles (1.2 million kilometers) above the surface of the sun on Thanksgiving Day (Nov. 28). The comet has brightened considerably as it has zoomed closer and closer to the
sun in recent weeks, thrilling stargazers who have captured amazing photos of ISON and giving researchers
interested in comet composition a lot to look forward to in the coming days.


"We're going to see primitive solar system material outgassing and sublimating when it's right close to the sun," said Karl
Battams of the U.S. Naval Research Lab in Washington, D.C., who studies "sungrazing" comets like ISON. "So that right there gives us a huge chunk of valuable information." [How to See Comet ISON in the Night Sky]


 



A pristine sungrazer 


It's not particularly rare for a comet to zip close to the sun, or even dive straight through our star's sizzling-hot atmosphere. But Comet ISON is special, researchers say.


For starters, Comet ISON is bigger than most other sungrazers, with a core estimated to be about 1,650 feet (500 meters) wide,
Battams said. Further, Comet ISON is likely making its first trip through the inner solar system from the distant, frigid comet repository known as the Oort Cloud. So its volatile components have not been baked off
already by previous encounters with the sun, giving scientists a rare look at a relatively pristine comet.







The deep-frozen Comet ISON could blaze spectacularly as it whips past the sun at Thanksgiving 2013. Learn all
about Comet ISON's 2013 visit to the inner solar system in this SPACE.com infographic.
Credit: Karl Tate, SPACE.com contributor




"You have the primitive solar system material in a sungrazing orbit — that's something that is basically unprecedented in modern
recorded history," Battams told SPACE.com. "I'm sure it's happened before, but we have no definite record of a sungrazing Oort Cloud comet."


In addition, ISON was discovered back in September 2012, giving researchers lots of time to prepare for its solar flyby. They've
thus been able to track the comet's journey with a variety of instruments on the ground and in space as part of the NASA-organized Comet ISON Observation Campaign (CIOC).


"We see sungrazing comets all the time, but they're always very small, and usually we get to see them maybe for a few hours in
spacecraft data," said Battams, who is a member of the CIOC team. "In this case, with ISON, we've had well over a year of observing a sungrazing comet. So that helps us build up a picture of
its behavior before it becomes a sungrazer, and then we can compare that to its behavior after it has done the sungrazing thing, assuming it survives."


 



Comet Quiz: Test Your Cosmic Knowledge




Comets are debris left over after the solar system formed 4.6 billion years ago. Let's see what you know about these ancient and elusive celestial wanderers.


Start the Quiz





 




0 of 10 questions complete





Learning about the sun 


Sungrazing comets like ISON also give
researchers a chance to learn more about our star. For example, scientists can measure the speed and other characteristics of the solar wind by noticing how the comet's tail behaves while
it's still relatively far from the sun.


And as ISON dives past the sun on Thursday, a trail of its particles will cling to the magnetic field in the sun's atmosphere,
opening a window on the processes occurring in this extreme environment.


"That helps us learn about some of the velocities of things that are going on there, the temperatures. We get to actually
visibly see the magnetic field structure," Battams said. "It's a completely unique probe of that region of the solar system."


neo 26/11/2013 15:43


Encke fera peut-être encore plus parler d'elle ...


COMET MOVIE--UPDATED: Comet ISON is getting all the press, but there is a second comet near the sun as well: Comet Encke. NASA's STEREO-A
spacecraft is monitoring both. Click to view an updated movie of the solar wind buffeting two comets:





In the movie, which spans a three+ day period from Nov. 20 to Nov.
23, the sun is to the right, off-screen. At first glance, Earth and Mercury appear to be labeled backwards. The strange arrangement is actually correct. This is how the two planets appear from
STEREO-A's vantage point over the farside of the sun.


"The dark 'clouds' moving from left to right are density enhancements in the solar wind, and these are what are causing the ripples you see in the comet tails," explains Karl Battams of NASA's
Comet ISON Observing Campaign.


The ripples could become even more dramatic if a CME hits the comets. This is Comet ISON's first visit to the sun, but Comet Encke has been here before. In 2007 a CME hit Encke and ripped off its tail. Battams and other researchers hope something similar is about to happen now. "I'd love to see a
big CME hit Comet ISON," he says in a story from Science@NASA. Watching the impact could teach researchers
new things about CMEs and comets.


Stay tuned for updated movies from NASA's solar fleet.


Realtime Comet ISON Photo Gallery


WHICH SIDE OF THE SUN IS FACING COMET ISON? When Comet ISON sweeps through the sun's atmosphere on Nov. 28th, it will be in the 'hot zone'
for CMEs. A strike by one of the massive storm clouds probably wouldn't destroy the comet, but it could have a
dramatic effect on the comet's fragile tail. The odds of a strike depend on which side of the sun is facing the comet at the time of the flyby. This is something you can monitor using a NASA
iPhone app called the Interplanetary 3D Sun:





The app displays an interactive 3D model of the entire sun photographed by extreme UV cameras onboard NASA's twin STEREO probes. The data are realtime and fully interactive (pinch, spin and
zoom). As shown in this target list, you can view the sun from many locations around
the solar system--including Comet ISON.


Active regions are color-coded by their potential for flares: Orange means "expect M-class solar flares," while red denotes sunspots capable of
X-flares. In the screen shot above we see that Comet ISON is bearing down on an active
region, AR1904, that poses a threat for M-class eruptions. A CME might be in the offing after all. Solar flare
alerts: text, voice


COMET ISON, PARTING SHOTS: As Comet ISON approaches the sun, it is becoming increasingly difficult for observers on Earth to photograph the
comet. Indeed, by Nov. 24th it seemed impossible. But it only seemed that way. Working from a high-altitude site in the Canary islands, Juan Carlos
Casado successfully imaged Comet ISON on Sunday morning deep inside the rosy glow of dawn:





"I took this picture of Comet ISON on Nov. 24th at 6: 25 UT from the Teide Observatory," says Casado. "The comet was over the distant island of Gran Canaria above a sea of clouds about 1 hour
before sunrise and only 16° from the sun. The exceptional atmospheric conditions of Teide Observatory allowed me to capture the image."


Could this be the last clear photo of Comet ISON taken from Earth? No one knows. Stay tuned to the realtime photo gallery for more parting shots:


Realtime Comet ISON Photo Gallery



Realtime Space Weather Photo Gallery



Realtime Aurora Photo Gallery


















Hélios 26/11/2013 15:03


Salut,


Qu'est-ce qu'on voit sur la dernière photo LASCO ? Ison ou autre chose ?


http://sohowww.nascom.nasa.gov/data/realtime/c3/512/


Ici, bien expliqué la progression pour voir sur les instruments :


http://www.nasa.gov/content/goddard/nasas-solar-observing-fleet-to-watch-comet-isons-journey-around-the-sun/


Bisous

Ferlinpimpim 26/11/2013 15:13



Salut Hélios, tu as raté le billet précédent. La grosse étoile est Antares. Je pense qu'Encke s'est désintégrée, depuis, mais Ison est toujours là. Bisous.