Salut Damien,

En fait,nous avons à faire à 2 taches assez conséquentes et déjà très actives,comme on peut le voir et qui seront en effet face à nous dans les 5 prochains jours....

Sur ce site on nous donne des prévisions sur d'éventuelles éjections et leurs classes avec les taches en présence:

http://spaceweather.inf.brad.ac.uk/fm/

Et pour finir,je te souhaite mes meilleurs voeux pour cette nouvelle années,dans un climat général qui promet en événement....  ;)

• • Ferlin1

    Mercredi 9 Janvier 2013 à 19:18
    Merci Stephane. Meilleurs voeux à toi aussi. Je ne m'attendais pas du tout à cette deuxième tache, exactement à la même latitude. Elle est très certainement liée à 1654, ce qui en fait une configuration encore plus dangereuse. Tôt ce matin, ce n'était pas encore visible...Ca va être rock and roll, si le Soleil le veut...

Salut Ferlin,

Il y a une deuxième tâche qui suit celle-ci. C'est plutôt rare ce genre de configuration. Bientôt des aurores boréales en France ?

• • Ferlin1

    Mercredi 9 Janvier 2013 à 19:12
    Salut Vax... Tu fais bien de m'en parler, je n'avais même pas regardé, je m'en étais tenu à 1654... Et bin, surprenant... Quelle configuration!!!.... Ca peut être très sensible...

January 9, 2013 – INDIAN OCEAN – Because the Carlsberg Ridge is one of the slowest-spreading, and so supposedly less active oceanic ridges, many had thought it unlikely to be the location of a major volcanic eruption.. At ridges such as this, heat is thought to be released more slowly from the underlying magma. However, we may have to rethink that previous assessment. The Carlsberg Ridge region is currently being shaken by a major seismic swarm, which could very well be volcanic in nature. The strongest tremor in the current swarm is a magnitude 5.0. Nature journal said in previous eruption, “A huge plume of hydrothermal chemicals, drifted up to 1.4 kilometers above the vent site and 70 kilometers along the underwater ridge was seen some years ago. It's by far the biggest vent plume ever seen, and confirms that such plumes form following volcanic eruptions at the sea floor, even at slow-spreading oceanic ridges.” ¹

The Carlsberg Ridge is the northern section of the Central Indian Ridge, a divergent tectonic plate boundary between the African Plate and the Indo-Australian Plate, traversing the western regions of the Indian Ocean. The ridge of which the Carlsberg Ridge is a part extends northward from a triple point junction near the island of Rodrigues (the Rodrigues Triple Point) to a junction with the Owen Fracture Zone. The ridge started its northwards propagation in the late Maastrichtian and reached the incipient Arabian Sea in the Eocene. Then it continued to accrete basalt but did not propagate for nearly 30 Ma. Then, in the early Miocene it started to propagate westwards towards the Afar hot spot, opening the Gulf of Aden. The Carlsberg Ridge is seismically active, with a major earthquake being recorded by the U.S. Geological Survey at 7.6 on the moment magnitude scale on July 15, 2003.

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January 9, 2013 – SPACE - Near Earth Asteroid (NEA) 2012 DA14 has its annual flyby of the earth on February 15, 2013. Its projected orbit, according to NASA, will bring it well within the orbits of geosynchronous satellites currently orbiting our planet. NASA has indicated that there is no danger of this asteroid impacting our planet, however they have not ruled out our gravity changing the asteroids orbital pattern. NEA 2012 DA 14 was discovered on February 23, 2012 by the Observatorio Astronómico de Mallorca (OAM), near the Spanish city of La Sagra. According to NASA’s Near Earth Object Program, NEO, the asteroid will pass the earth at a distance of 21,000 miles, putting the asteroid’s trajectory in between the earth and the satellites orbiting our planet. Geosynchronous satellites orbiting our planet orbit at a distance of roughly 26,200 miles above the earth. Geostationary orbiting objects orbit at a distance of roughly 22,236 miles above the Earth’s equator. These objects are considered to be in High Earth Orbit (HEO). Any object in space considered to be in a Low Earth Orbit (LEO) is approximately 1250 miles above the equator. The term Medium Earth Orbit (MEO) refers to an orbiting object approximately 12,500 miles above the Earth’s equator, in between objects in an LEO and a HEO, geosynchronous orbit.

With Near Earth Asteroid 2012 DA 14′s flyby falling somewhere in between geosynchronous satellite orbit, and objects orbiting in a Medium Earth Orbit pattern, the potential for this NEO impacting other objects orbiting our planet appears to be almost guaranteed. Could one of these objects be impacted by the asteroid and then be propelled back into our atmosphere? The chance of this happening is low, and NASA has not indicated if this potential happenstance will occur. Asteroid 2012 DA 14 has an estimated diameter of about 45 meters, and a mass of roughly 130,000 metric tons, making it a medium-sized asteroid. If Asteroid DA 14 were to impact the Earth, it would do so with the energy of 2.4 Megatons. Additionally NASA estimates the closest it can get to the earth will be 17,000 miles above the equator. NASA continually tracks these asteroids, through their Near Earth Object Program (NEO) in association with the Jet Propulsion Laboratory (JPL). NASA’s Wide-field Infrared Survey Explorer program (WISE) searches the skies of our solar system making observations in an effort to assess Potentially Hazardous Asteroids (PHA) orbiting close to our planet. Potentially hazardous asteroids are a smaller subset of the larger group called the Near Earth Asteroids (NEA) that have close orbits to the Earth’s and are big enough to survive passing through our atmosphere and causing damage of great proportions. The asteroid hunting portion of the WISE program is called NEOWISE. “The NEOWISE analysis shows us we’ve made a good start at finding those objects that truly represent an impact hazard to earth,” said Lindley Johnson, program executive for the Near Earth Object Observation Program at NASA. “But we’ve many more to find, and it will take a concerted effort during the next couple of decades to find all of them that could do serious damage or being mission destination in the future. NASA’s NEOWISE project, which wasn’t originally planned as part of WISE, has turned out to be a huge bonus,” said Amy Mainzer, NEOWISE principal investigator, at NASA’s Jet Propulsion Laboratory in Pasadena California. “Everything we can learn about these projects helps us understand their origins and fate. Our team was surprised to find the over abundance of low inclination PHA’s. Because they will tend to make more close approaches to earth, these targets can provide the best opportunities for the next generation of human and robotic exploration.” Pres. Obama has called for NASA to access an asteroid in orbit for the purposes of exploring ways to divert its orbit away from the earth in the event of a potential impact. A new project, initiated by scientists at California’s Institute for Space Studies, would put an asteroid into orbit around the Earth’s moon, giving us the ability to study it from a closer distance then the asteroids standard orbit. The majority of asteroids orbiting in our solar system do so in the main asteroid belt, between the planets Mars and Jupiter. –Guardian

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The latest from NASA's Earth Observatory (08 January 2013)
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Latest Images:
http://earthobservatory.nasa.gov/IOTD/

* Campi Flegrei, Italy
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* Snow Cover Extent Declines in the Arctic
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* Appalachian Mountains
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* Winter in Southern Greenland
 http://earthobservatory.nasa.gov/IOTD/view.php?id=80082&src=eoa-iotd

* 30th Anniversary of the Pu'u 'O'o Eruption on Kilauea
 http://earthobservatory.nasa.gov/IOTD/view.php?id=80091&src=eoa-iotd

* The Hills of Vladivostok
 http://earthobservatory.nasa.gov/IOTD/view.php?id=80042&src=eoa-iotd

* Storm Turns the Taklimakan Desert White
 http://earthobservatory.nasa.gov/IOTD/view.php?id=80058&src=eoa-iotd

* Moon Phases Over the Persian Gulf
 http://earthobservatory.nasa.gov/IOTD/view.php?id=79834&src=eoa-iotd

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Earth Matters
* Our Top 10 Most Popular Images of 2012
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