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| Wednesday, May 28, 2008 at 7:57 AM | Earth-Sized Tornadoes Seen on the Sun Stormy Sun May 27, 2008 -- A fiery tornado towering more than 10,000 kilometers has been spotted twirling on the surface of the sun and firing white-hot charged particles into interplanetary space, say solar scientists. The short-lived plasma twister of April 9, 2008, is leading to new insights about how some high-speed particles -- a particularly dangerous kind of heavy solar radiation for satellites and astronauts -- get catapulted towards Earth. "What we see more...is that the twist is a key element," said Etienne Pariat, a solar scientist at George Mason University in Virginia.
The twist acts like a spring to push material out of the sun, he explained at a May 27 press briefing at the American Geophysical Union Joint Assembly in Fort Lauderdale, Fla.
The coiled eruption on the sun was one of three or four that happen every hour, though until now they were very hard to see and make sense of, explained Edward DeLuca, an astrophysicist at the Harvard-Smithsonian Center for Astrophysics.
The trick to the April 9 twister is that it was caught happening while the bright surface flare was just over the sun's horizon, and so out of view. That allowed the less bright parts of what was going on to become visible.
"It's a beautiful view of the process," said DeLuca.
By seeing it edge-on, it doesn't blind the telescopes on the X-Ray Telescope aboard the solar-observing Hinode satellite, he explained. "When the flare is behind the disk it's easier to see the flare structure."
Another key to confirming the tower of twisting plasma was the additional observations made by the two identical STEREO solar satellites which are a couple of million miles apart. The double images from different vantage points allowed scientists to literally untangle the lines of plasma and verify that this was, indeed, a tornado-like feature.
Before the STEREO satellites went into operation in 2006 solar scientists had no depth perception when they looked at the sun. So even though twisting features were seen, they were impossible to confirm.
"The situation here was dramatically improved when the information from STEREO became available," said Spiros Patsourakos, also of George Mason University.
With the new observations Pariat and Patsourakos were able to compare the real solar twisters to structures they have generated in computer simulations. The nice match they have found in this case means they are beginning to get a handle on how the sun makes these flares and eruptions. That in turn ought to help in the forecasting of space weather around Earth -- which is entirely ruled by the sun.
Storms of high-speed charged particles from the sun can create auroras, interfere with high latitude radio transmissions, create global electrical problems and damage satellites. less |
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Created: Mar 10, 08 | 1 Entry | 71 Views |  |
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| Catalina Excursion Part 2 |
| My friend Jon and I arrive at Catalina Island and walk to a cove to do some snorkeling in the ocean and sightseeing on the beach. http://www.VideoPro2Go.com |
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| Added Aug 31, 09 by VideoPro2Go |
| My friend Jon and I arrive at Catalina Island and more...walk to a cove to do some snorkeling in the ocean and sightseeing on the beach. http://www.VideoPro2Go.com less |
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| Added Aug 31, 09 by VideoPro2Go |
| My friend Jon and I hop on the Marina Flyer and head more...over to Catalina Island to do some sightseeing and snorkeling. http://www.VideoPro2Go.com less |
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| Added Aug 15, 09 by VideoPro2Go |
| A great way to enjoy the splendor of the desert is more...on a motorcycle! Especially when you're riding with with a sexy and fun-loving lady! This was shot entirely in Joshua Tree National Park by Daniel Wolfert. http://www.VideoPro2Go.com less |
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| Added Aug 11, 09 by VideoPro2Go |
| Some shots from the Mojave Desert that capture the more...splendor of its plants, animals and vistas. A video by Daniel Wolfert. http://www.DanielWolfert.com less |
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| Added Jul 20, 09 by Thoroughbred |
| 3 year old COLT - Strong pedigree |
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| Added Jul 20, 09 by Thoroughbred |
| California Native - Studios |
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| Added Jun 24, 09 by VideoPro2Go |
| Last fall my friend Alex and I went location scouting more...in Oak Creek Canyon which is between Flagstaff and Sedona. We camped at Cave Springs Campground. We also did some climbing. The views were magnificent and inspirational. less |
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| Added Jun 10, 09 by VideoPro2Go |
| Joshua Tree National Park in California. A video by more...Daniel Wolfert. less |
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| Added Jun 3, 09 by VideoPro2Go |
| In 2008 I visited my Cousin Shelia and her boy Jimmy. more...They live in the Sierra Nevada Mountains east of Stockton, CA. We did some sightseeing to California Caverns and Big Tree State Park. less |
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