| Where's Saturn? Is that a UFO--or the ISS? What's the name of that star? Get the answers from mySKY--a fun new astronomy helper from Meade. |
BEWARE THE MARS HOAX: A rumor is going around: On Aug. 27th Mars will swell to the size of the full Moon. Don't believe it. Mars will look perfectly normal on Aug. 27th. But there is something eerie and Martian to look for in the sky next week. Get the full story from Science@NASA.
SOLAR ERUPTION: Although the sun is near the lowest ebb of its 11-year activity cycle, spectacular eruptions are still possible. NASA's Stereo-A spacecraft recorded one just last week on August 18th. Click on the image to play the 2.2 MB movie:
This is a solar prominence, a cloud of hydrogen held above the surface of the sun by magnetic force fields. Stereo A photographed the prominence just as the magnetic fields became unstable, producing a twisting, spouting eruption large enough to swallow Earth many times over. Soon, Stereo A will combine data with its sister ship Stereo B on a regular basis. The resulting 3D images will give researchers an unprecedented view of the inner workings of solar activity: more.
GIGANTIC JETS: Think of them as sprites on steroids: Gigantic Jets are lightning-like discharges that spring from the top of thunderstorms, reaching all the way from the thunderhead to the ionosphere 50+ miles overhead. They are enormous and powerful.
You've never seen one? "Gigantic Jets are rare," explains atmospheric scientist and Jet-expert Oscar van der Velde of the Université Paul Sabatier's Laboratoire d’Aérologie in Toulouse, France. "The first one was discovered in 2001 by Dr. Victor Pasko in Puerto Rico. Since then fewer than 30 jets have been recorded--mostly over open ocean and on only two occasions over land."
That's why researchers are excited by the events of Aug. 20th. On that night, amateur astronomer Richard Smedley of Broken Arrow, Oklahoma, was hunting for meteors using a low light video camera when instead he caught two Gigantic Jets:
Click on the image to view the 4.5 MB video
"They were much brighter than a typical meteor--more like a fireball," says Smedley. To appreciate the size of these things, consider the following: "They came from a thunderstorm more than 100 miles away in Missouri: map." This means the Jets were about 48 miles tall measured upward from the top of the thundercloud.
Because they connect thunderstorms directly to the ionosphere, Gigantic Jets play some role in the global flow of electricity around our planet, but how big is that role? "No one knows," says van der Velde. "This is cutting-edge research and these photos from Oklahoma provide an exciting new case-study."
Amateur astronomers, you can contribute to this research. Check your local weather radar map for storms just over the horizon, point your meteor cameras in that direction, and click. Gigantic Jets may not be as rare as we think.