Sun Unleashes Spectacular Solar Eruption
NASA's Solar Dynamics Observatory
A burst of solar material leaps off the left side of the sun in what’s known as a prominence eruption.
Image: The Aug. 9 X-class solar flare erupts
Living With a Star
Aug. 9, 2011 --
In April 2010, NASA's Solar Dynamics Observatory (SDO) opened its eyes for the first time. Since then, the spacecraft has revolutionized our understanding of the star on our cosmic doorstep. Through the SDO's high definition view of the sun, solar mysteries have been solved and new mysteries have been revealed for the first time. Today, as the sun ramps up in activity -- fast approaching solar maximum, predicted to occur in 2013 -- our nearest star has generated the largest explosive event since 2006: an X-class solar flare. The "X7" flare reverberated through the inner solar system, causing a storm of high-energy protons to buzz around our planet, drenching our upper atmosphere in X-rays. Even though the flare was directed away from Earth, its impact was felt. To commemorate the most energetic flare in five years, Discovery News has teamed up with Camilla Corona SDO (the SDO's famous mission mascot) to collect some of the SDO's most breathtaking photographs of the past few months.
First Light On April 21, 2010, the first photographs from the SDO were received. One of the iconic first views of the high-definition sun was that of a rising prominence; an arc of solar plasma slowly rising into the sun's hot corona.
Valentines Flare Late on Feb. 14, 2011, while the world celebrated the final hours of Valentines Day, the sun let rip with Solar Cycle 24's first X-class solar flare. At the time, the X2 blast was the biggest since the previous cycle's X9 flare in Dec. 2006.
View Blocked The nature of the SDO's orbit around the Earth means it rarely has its view of the sun interrupted. But occasionally, an unavoidable celestial event causes a break in solar observing service. This partial solar eclipse, as witnessed on July 10, 2010, was the first eclipse experienced by the SDO. Note the edges of the moon's shadow across the sun's disk -- lunar mountains and valleys are silhouetted.
Prominence Rains Down On Feb. 24, 2011, the SDO zoomed in on an M-class flare (a "medium-sized" eruption) to see a vast amount of solar plasma rain back down toward the solar "surface" -- the photosphere.
Comet Death Comets often take a death-plunge deep into the solar corona, ultimately getting snuffed out of existence by the searing heat of the sun. Now we have an incredibly powerful solar observatory looking deep into the corona, we can see these "dirty snowballs" pay the ultimate price.
Coronal Rain What goes on deep in the sun's corona often stays deep in the sun's corona. Until now. With the help of the SDO, solar scientists are able to spot tiny dynamic features in the lowermost regions of the sun's atmosphere. One phenomenon characterized by the SDO is "coronal rain" -- blobs of hot solar plasma "raining" down onto the solar surface. Oh, and that black filament thing sitting in the center of the image? That's just a piece of fluff that stowed away with the SDO before it was launched, forever stuck in the telescope's lens.
Sunspots Sunspots are blemishes seen on the sun's surface. They are the side effect of the tangled magnetic fields from the solar interior getting forced through the sun's photosphere. As the hotter plasma above the photosphere is pushed away, the cooler interior is exposed, producing a dark spot. Sunspots are immensely detailed and the SDO can peer right into them, showing intricate plasma flows and magnetic structures. The pixelated textures surrounding this sunspot group is known as granulation -- regions where plasma up-wells from the solar interior and sinks again, like the convection of boiling water in a saucepan.
Twisting Prominence On March 19, 2011, a beautiful, twisting prominence erupted into space from the solar limb. The incredible detail of the hot solar plasma wrapped in a coiled magnetic field was easily captured as the arc expanded.
An Epic Event On June 7, 2011, something happened to the sun. This "something" baffled solar physicists. This "something" had never been seen before. During a "medium" M-class solar flare, a huge quantity of solar material was kicked into space, but most couldn't escape the sun's gravitational pull. The result was a dense, dark, "giant clod of dirt" that obscured the solar disk. A coronal mass ejection (CME) was also generated, but this fascinating eruption was notable for the strangeness of the imagery captured by the SDO.
An intense solar storm erupted from the sun on Friday (May 3) in a dazzling space weather display captured by a NASA spacecraft.
The solar flare erupted from the edge the sun, with NASA's powerful Solar Dynamics Observatory snapping photos of the sun storm. The flare peaked at 1:32 p.m. EDT (1732 GMT), registering as a relatively medium-strength M5.7-class event.
Friday's solar storm was the second major space weather event in three days, but was not aimed at Earth. According to astronomer Phil Plait, who chronicled the flare on his Bad Astronomy blog, the solar storm launched super-hot solar plasma about 120,000 miles (200,000 kilometers) above the surface of the sun before it faded from view.
The sun fired off a May Day solar eruption on Wednesday (May 1) from the same region, which is currently at the very leftmost edge (or limb) of the sun as seen by the Solar Dynamics Observatory. The active region will be rotating to face Earth soon, mission scientists said.
"Increased number of flares are quite common at the moment, as the sun's normal 11-year activity cycle is ramping up toward solar maximum, which is expected in late 2013," NASA officials said in a statement.
The strongest solar flare of the year occurred on April 11 and registered as an M6.5-class sun storm, still a mid-level event. Scientists classify solar flares based on their intensity. M-class solar flares are medium-strength events that are the weakest type of storm that can still have an impact on Earth. When aimed directly at Earth, they can super-charge the planet's aurora displays.
The strongest type of solar flare are X-class sun storms. When aimed directly at Earth, X-class solar flares can pose a threat to spacecraft and astronauts in space. They can also interfere with communications and GPS navigation signals, and cause radio blackouts.
A radio short-lived radio blackout was caused by the Friday solar flare, but subsided quickly, NASA officials said.
The sun's current solar weather cycle is known as Solar Cycle 24. The Solar Dynamics Observatory is one of several spacecraft constantly monitoring the sun to track its solar weather events.
The Sun in HD: Latest Photos by NASA's Solar Dynamics Observatory
Anatomy of Sun Storms & Solar Flares (Infographic)
The Sun's Wrath: Worst Solar Storms in History
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