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A LA UNE

25 avril 2014 5 25 /04 /avril /2014 07:05

A la limite de la visibilité terrestre....

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neo 02/05/2014 20:19


http://www.space.com/25702-twisters-on-the-sun-spotted-by-spacecraft-video.html


A NASA spacecraft has captured spectacular video of an enormous plasma "tornado" spinning off the sun.


NASA's Solar Dynamics Observatory probe, or SDO, watched the dark-hued twister churn and ultimately erupt over the course of one day, from April 29 to 30. Mission scientists used the spacecraft's
imagery to create an 18-second-long video of the dramatic solar tornado.


"The suspended plasma is being pulled and stretched by competing magnetic forces until something triggers the breakaway," NASA officials wrote on SDO's Facebook page, assuming the voice of the
spacecraft. "This kind of activity is fairly common on the sun, but we have only been able to view them at
this level of detail since I began operations just four years ago."


 


The plasma appears dark in this ultraviolet-light view because it is cooler than the material surrounding it, NASA officials added.


The $850 million Solar Dynamics Observatory launched in February 2010 on a five-year mission to study
the variations in solar activity that influence life on Earth. The probe uses three different instruments to observe the sun, gathering data that is helping scientists better understand the solar
magnetic field and space weather.


Over the course of its operational life, SDO has recorded many stunning images of solar flares, coronal mass ejections and other sun phenomena.


 



Solar Quiz: How Well Do You Know Our Sun?




Many of us take the sun for granted, giving it little thought until it scorches our skin or gets in our eyes. But our star is a fascinating and complex object, a gigantic fusion
reactor that gives us life. How much do you know about the sun?


Start the Quiz





 




0 of 10 questions complete





In September 2011, for example, the spacecraft recorded video of another solar tornado — this one five times the size of Earth — swirling across the sun, twisting at speeds of up to 186,000 mph
(300,000 km/h). (For comparison, tornado wind speeds here on Earth max out at around 300 mph, or 480 km/h.)


Solar activity waxes and wanes on an 11-year cycle. The sun is now in an active phase of the current cycle, which is known as Solar Cycle 24. However, the sun has been notably quiet during Solar
Cycle 24, and scientists say the current maximum is the weakest in the last century or so.


Follow Mike Wall on Twitter @michaeldwall and Google+. Follow us @Spacedotcom, Facebook or Google+. Originally published
on Space.com.




EDITOR'S RECOMMENDATIONS



'Twisters' On The Sun Spotted By Spacecraft | Video


The Sun's Wrath: Worst Solar Storms in History


Anatomy of Sun Storms & Solar Flares (Infographic)


Attack of the Sun | Video Show






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Sun Unleashes Major Solar Flare (Video)





Solar Eclipse Map Shows What Tuesday's Eclipse Will Look Like Anywhere





Total Solar Eclipses: How Often Do They Occur (and Why)?





'Twisters' On The Sun Spotted By Spacecraft | Video





Deadly Tornado Outbreak Seen From Space (Video)





Could Alien Life Cope with a Hotter, Brighter Star?





Length of Alien Planet's 'Day' Clocked for 1st Time, an 8-Hour World





Private Team Wants to Bring 36-Year-Old NASA Probe Out of Retirement




neo 28/04/2014 15:08


http://earthsky.org/tonight/partial-solar-eclipse-for-australia-afternoon-of-april-29?utm_source=EarthSky+News&utm_campaign=716fdec5cb-EarthSky_News&utm_medium=email&utm_term=0_c643945d79-716fdec5cb-393511181







Partial solar eclipse for Australia afternoon of April 29







 



65 










Tonight for April 28, 2014


Courtesy U.S. Naval Observatory





Image top of post via David Paleino




Annular eclipse – aka a “ring of fire” eclipse – via Hiroki Ono. View larger



Someone at just the right spot in Antarctica could see an annular eclipse of the sun – sometimes called a ring of fire eclipse – on April 29, 2014. From there, the new moon will block out all but the outer edge of the sun’s disk. Outside of this small, inaccessible region of
Antarctica, though, the April 29 solar eclipse will be partial for those able to see it. In particular, a partial solar eclipse will be seen from across Australia. Follow the links
below to learn more.



Who can see the April 29, 2014 solar eclipse?



Local eclipse times for major cities in Australia


You need this! Observing solar eclipses safely



What causes a solar eclipse?



Eclipse calculators for your sky




Map shows worldwide extent of 2014 April 29 solar eclipse. The numbers from 0.20, 0.40, 0.60 and 0.80 represent the magnitude of the eclipse – the fraction of the solar diameter that
is covered over by the moon. In Antarctica, where there is an annular eclipse, the magnitude = 0.9868.





Animation of the 2014 April 29 solar eclipse



Who can see the April 29, 2014 solar eclipse? Most people who see the partial solar eclipse on April 29 will be in Australia. Those in southern Australia will see the
new moon obscure about 50% of the solar disk in their afternoon hours on April 29. In far-northern Australia (and far-southern Indonesia), observers will see only a tiny, tiny portion
of the solar disk eclipsed by the new moon.


In Melbourne, the eclipse will occur from 3:59 p.m. to sunset before its actual end at 6:09 p.m.,
starting at 16o (1 and 1/2­ hands) above the horizon.


In Sydney, the eclipse will occur from 4:13 pm to sunset, before its actual end at 6:10 p.m.,
starting at 11o (about 1 hand) above the horizon.


Outside of Australia, the partial solar eclipse is visible from parts of Antarctica, a large swath of the South Indian Ocean and the extreme southern reaches of Indonesia.


We list the local times for the partial eclipse for three Australian cities (Perth, Alice Springs and Melbourne). No conversion from Universal Time to local time in your locality is
necessary. Click here for eclipse times at more localities in Australia, Indonesia and the Indian Ocean. Keep in
mind that you need to convert Universal Time to your local time.


Local eclipse times for major cities in Australia, on April 29


Perth, Western Australia
Partial solar eclipse begins: 1:18 p.m. local time
Greatest eclipse: 2:43 p.m.
Partial solar eclipse ends: 4:00 p.m.


Alice Springs, Northern Territory
Partial solar eclipse begins: 3:45 p.m. local time
Greatest eclipse: 4:48 p.m.
Partial solar eclipse ends: 5:44 p.m.


Melbourne, Victoria
Partial eclipse begins: 3:59 p.m. local time
Greatest eclipse: 5:07 p.m.
Sunset: 5:34 p.m.
Partial eclipse ends: 6:09 p.m.


Source: Timeandate.com


Source: Dr. Jay Pasachoff of Williams College


Click here for eclipse times at more localities in Australia, Indonesia and the Indian Ocean.


How do I translate Universal Time into my time?


The French amateur astronomer Xavier Jubier, of Paris, has put a map online; it is a Google map that can be zoomed into, and which enables you to click where you are and find out what
you will see there: http://bit.ly/1rqvwE0




Leaf shadows enable you to watch a solar eclipse indirectly and safely. Image credit:






neo 26/04/2014 12:50




Sun Unleashes Major Solar Flare (Video)



By Tariq Malik, Managing Editor   |   April 25, 2014 06:47am ET







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The sun erupted with a massive solar flare late Thursday (April 24), triggering a temporary communications blackout on some parts of Earth.


The powerful flare peaked at 8:27 p.m. EDT Thursday (0027 April 25 GMT), and ranked as an X1.3-class solar storm, one of the strongest types of flares the sun can experience, according to a
report from the U.S. Space Weather Prediction Center. NASA's sun-watching Solar Dynamics Observatory captured video of the intense solar flare in several difference wavelengths.


The solar flare erupted from an active sunspot region known as Region 2035 located on the far western side (or limb) of the sun as seen from Earth. Because of its position, the flare sparked a
high-frequency radio blackout for about an hour on the daytime side of Earth, most likely over the Pacific Ocean and Eastern Pacific Rim, according to the SWPC update. [Photos: The Biggest Solar Flares of 2014]


 







An X1.3-class solar flare (far right) erupts from the surface of the sun
on April 24, 2014 EDT (April 25 GMT).
Credit: NASA/Solar Dynamics Observatory

View full size image










X-class flares top the scale with the most energy and potential to disrupt communications on Earth. See how
solar flares compare to each other in this Space.com inforgraphic.
Credit: Karl Tate, SPACE.com Contributor

View full size image





"Region 2035 is rotating out of view and won't pose any danger for much longer, but could in the immediate future," SWPC officials wrote in the update.


When aimed directly at Earth, X-class solar flares can endanger astronauts in space, as well as interfere with communications and navigation satellites in orbit. The most powerful X-class flares
can also affect power grids and other infrastructure on the Earth.


Thursday's solar flare was the fourth X-class solar flare of 2014. It followed an X1.2 solar flare on Jan. 7, a monster
X4.9 solar flare on Feb. 24, as well as an X1 solar flare on March 29.


While X-class flares are the most powerful eruptions on the sun, the star also experiences more moderate M-class solar flares (which can supercharge Earth's aurora displays) and weaker C-class
storms.  The sun is currently in an active phase of its 11-year weather cycle, and was expected to reach its peak activity in 2013.


NASA and other space and weather agencies keep watch on the sun's activity using a fleet of spacecraft, including the Solar Dynamics Observatory, NASA's twin STEREO spacecraft and other probes.


Email Tariq Malik at tmalik@space.com or follow him @tariqjmalik and Google+. Follow us @Spacedotcom, Facebook and Google+. Original article on Space.com.

neo 26/04/2014 12:47


http://www.space.com/25631-sun-unleashes-major-solar-flare-video.html?cmpid=557164


http://www.space.com/25627-powerful-x-flare-erupts-on-sun-s-western-limb-video.html


 

neo 26/04/2014 12:44


Space Weather News for April 25, 2014
http://spaceweather.com

X-FLARE: On April 25th, an active region near the sun's western limb erupted, producing an impulsive X-class solar flare.  A pulse of extreme UV radiation from the flare ionized Earth's
upper atmosphere and caused a shortwave radio blackout on the dayside of Earth.   However, a CME hurled into space by the explosion will miss our planet.  Check http://spaceweather.com for updates.

neo 26/04/2014 12:44






When is the best time to see auroras? Where is the best place to go? And how do you photograph them? These questions and more are answered in a new book, Northern Lights - a Guide, by Pal Brekke & Fredrik Broms.



 



















LETTUCE ORBIT EARTH: A new life form is taking root on the ISS, and its name is "Outregeous." Astronauts would like to eat it, but mission
controllers are not giving permission ... yet. Get the full story from Science@NASA.


DOOMED MOON OF MARS: Mars has two small moons: Phobos and Deimos. One of them is doomed. Phobos orbits so close to Mars - about 5,800
kilometers above the surface compared to 400,000 kilometers for our own Moon - that gravitational tidal forces are dragging it down. In 100 million years or so Phobos will likely be shattered by
tidal shear, the debris forming a decaying ring around Mars.


With the countdown clock clicking, astrophotographer Peter Rosén was determined to photograph the diminutive moon, and on April 24th he succeeded:





"My previous attempt at photographing Phobos and Deimos resulted in Deimos alone, so I tried again last night,
slightly changing my setup," says Rosén. "This time I managed to get the even more elusive Phobos at mag. 11.8 , separated only by 11 arcseconds from the blindingly bright Mars at mag.
-1.28."

"I inserted the orbital path of both moons to show how much closer Phobos is to the planet compared to Deimos and also that Phobos is on track."

"So why doesn't Deimos show in this 2-frame animation?," he asks. "It was positioned below the planet at a separation
of 15 arcseconds at that time and being a full magnitude dimmer (almost 13) it was just invisible."


Realtime Mars Photo Gallery


RADIO BLACKOUT: An X-class solar flare
on April 25th irradiated Earth's upper atmosphere with extreme ultraviolet radiation. Waves of ionization rippled around the dayside of the planet, causing a widespread blackout of shortwave
radio transmissions. Radio astronomer Dick Flagg recorded the event at his observatory at the Windward Community College on Oahu:





"This is a dynamic spectrum," explains Flagg. "The vertical axis is frequency (MHz) and the horizontal axis is time (UTC)." All of the horizontal lines corresponding to terrestrial radio stations
vanished in the aftermath of the flare.


The active region responsible for the flare rotated off the solar disk yesterday, so even if it flares again, another radio blackout is unlikely this weekend. NOAA forecasters estimate the odds
of an X-flare on April 26th to be a scant 1%. Solar flare alerts: text, voice


Realtime Space Weather Photo Gallery



Realtime Aurora Photo Gallery



Realtime Comet Photo Gallery
















 


All Sky Fireball Network














Every night, a network of NASA all-sky cameras scans the skies above the United States for meteoritic fireballs. Automated software maintained by
NASA's Meteoroid Environment Office calculates their orbits, velocity, penetration depth in Earth's atmosphere and many other characteristics. Daily results are presented here on
Spaceweather.com.


On Apr. 25, 2014, the network reported 9 fireballs.
(9 sporadics)





In this diagram of the inner solar system, all of the fireball orbits intersect at a single point--Earth. The orbits are color-coded by velocity, from slow (red) to fast (blue). [Larger image] [movies]


On Apr. 24, 2014, the network reported 19 fireballs.
(15 sporadics, 4 April Lyrids)





In this diagram of the inner solar system, all of the fireball orbits intersect at a single point--Earth. The orbits are color-coded by velocity, from slow (red) to fast (blue). [Larger image] [movies]














 


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