NASA's Fermi Catches Thunderstorms Hurling Antimatter Into Space

/PRNewswire/ -- Scientists using NASA's Fermi Gamma-ray Space Telescope have detected beams of antimatter produced above thunderstorms on Earth, a phenomenon never seen before.

Scientists think the antimatter particles were formed in a terrestrial gamma-ray flash (TGF), a brief burst produced inside thunderstorms and shown to be associated with lightning. It is estimated that about 500 TGFs occur daily worldwide, but most go undetected.

"These signals are the first direct evidence that thunderstorms make antimatter particle beams," said Michael Briggs, a member of Fermi's Gamma-ray Burst Monitor (GBM) team at the University of Alabama in Huntsville (UAH). He presented the findings Monday, during a news briefing at the American Astronomical Society meeting in Seattle.

Fermi is designed to monitor gamma rays, the highest energy form of light. When antimatter striking Fermi collides with a particle of normal matter, both particles immediately are annihilated and transformed into gamma rays. The GBM has detected gamma rays with energies of 511,000 electron volts, a signal indicating an electron has met its antimatter counterpart, a positron.

Although Fermi's GBM is designed to observe high-energy events in the universe, it's also providing valuable insights into this strange phenomenon. The GBM constantly monitors the entire celestial sky above and the Earth below. The GBM team has identified 130 TGFs since Fermi's launch in 2008.

"In orbit for less than three years, the Fermi mission has proven to be an amazing tool to probe the universe. Now we learn that it can discover mysteries much, much closer to home," said Ilana Harrus, Fermi program scientist at NASA Headquarters in Washington.

The spacecraft was located immediately above a thunderstorm for most of the observed TGFs, but in four cases, storms were far from Fermi. In addition, lightning-generated radio signals detected by a global monitoring network indicated the only lightning at the time was hundreds or more miles away. During one TGF, which occurred on Dec. 14, 2009, Fermi was located over Egypt. But the active storm was in Zambia, some 2,800 miles to the south. The distant storm was below Fermi's horizon, so any gamma rays it produced could not have been detected.

"Even though Fermi couldn't see the storm, the spacecraft nevertheless was magnetically connected to it," said Joseph Dwyer at the Florida Institute of Technology in Melbourne, Fla. "The TGF produced high-speed electrons and positrons, which then rode up Earth's magnetic field to strike the spacecraft."

The beam continued past Fermi, reached a location, known as a mirror point, where its motion was reversed, and then hit the spacecraft a second time just 23 milliseconds later. Each time, positrons in the beam collided with electrons in the spacecraft. The particles annihilated each other, emitting gamma rays detected by Fermi's GBM.

Scientists long have suspected TGFs arise from the strong electric fields near the tops of thunderstorms. Under the right conditions, they say, the field becomes strong enough that it drives an upward avalanche of electrons. Reaching speeds nearly as fast as light, the high-energy electrons give off gamma rays when they're deflected by air molecules. Normally, these gamma rays are detected as a TGF.

But the cascading electrons produce so many gamma rays that they blast electrons and positrons clear out of the atmosphere. This happens when the gamma-ray energy transforms into a pair of particles: an electron and a positron. It's these particles that reach Fermi's orbit.

The detection of positrons shows many high-energy particles are being ejected from the atmosphere. In fact, scientists now think that all TGFs emit electron/positron beams. A paper on the findings has been accepted for publication in Geophysical Research Letters.

"The Fermi results put us a step closer to understanding how TGFs work," said Steven Cummer at Duke University. "We still have to figure out what is special about these storms and the precise role lightning plays in the process."

NASA's Fermi Gamma-ray Space Telescope is an astrophysics and particle physics partnership. It is managed by NASA's Goddard Space Flight Center in Greenbelt, Md. It was developed in collaboration with the U.S. Department of Energy, with important contributions from academic institutions and partners in France, Germany, Italy, Japan, Sweden and the United States.

The GBM Instrument Operations Center is located at the National Space Science Technology Center in Huntsville, Ala. The team includes a collaboration of scientists from UAH, NASA's Marshall Space Flight Center in Huntsville, the Max Planck Institute for Extraterrestrial Physics in Germany and other institutions.

-----
Community News You Can Use
Click to read MORE news:
www.GeorgiaFrontPage.com
Twitter: @gafrontpage & @TheGATable @HookedonHistory
www.ArtsAcrossGeorgia.com
Twitter: @artsacrossga, @softnblue, @RimbomboAAG @FayetteFP

Bring early spring to your home with indoor gardening

(ARA) - Do images of flowering trellises laden with yellow, pink, green and purple blooms dance through your dreams? You may be ready for some warm spring-like temperatures, but the weather outside is still a little frightful. Ignore the weather and bring spring inside with some indoor gardening.

Not only does bringing spring inside help brighten your home, but houseplants can also improve the quality of the air you're breathing. A NASA study found that houseplants remove up to 87 percent of toxic indoor air inside a sealed chamber within 24 hours.

By planting now, while winter is still in the air, you will have vegetables, herbs and flowers primed for transplanting when warmer weather finally arrives. And since they're inside, you can watch the plants as they shoot their little green stems out of the fresh dirt, monitoring them as they grow.

* Use loose potting soil to promote root growth. Outside, worms and insects tunnel through the dirt, naturally breaking it up to help plants spread their roots. To mimic their effect indoors, use potting soil mixed with peat moss, vermiculite and perlite to create a light texture that won't compact after a couple of waterings.

* Make sure the natural light is adequate. Some plants like direct sunlight and must be located near a south-facing window, while others prefer a few hours of indirect light. But to really keep your herbs and flowers looking strong all season long, consider using artificial light like the Grow Light Pro White from Wards.com, which can also help you get your spring garden started early with seedlings. The Grow Light has four lights that can be turned on as a unit or individually, and it has an adjustable bottom shelf so you can alter the light level as your plants grow.

When plants don't get the light they need, they start to appear thin and frail. As your plants begin to grow, make sure to rotate the pots so the stems grow straight, rather than bending unnaturally toward the source of light.

* Keep the humidity level above 50 percent with a humidifier. Not only will your plants appreciate the extra moisture, but so will you. When the humidity drops below 50 percent, most plants suffer from water loss through their leaves, and it's difficult to regain that water balance, even with frequent watering.

* Really bring spring inside your home with beautiful pots and decorating accents. Visit Wards.com to find beautiful and creative birdhouses that not only are functional, but stylish enough to hang inside. Consider hanging a wire birdhouse in the shape of an acorn in the kitchen window, or using a set of two birdhouses as a unique decoration for your entryway.

* Mix art and fun together with some ivy. Ivy topiaries are very easy to grow, and there are many creative planters and forms you can use to support the ivy as it winds its way toward the sun. Are you a music fan? A guitar and music stand with little pots incorporated into the design can help brighten up your living room. Or maybe you prefer a vintage look created by placing a Madeline Dress Form over your vines, allowing them to grow and construct the skirt. Both styles are available at Wards.com.

Courtesy of ARAcontent

-----
www.fayettefrontpage.com
Fayette Front Page
www.georgiafrontpage.com
Georgia Front Page
Follow us on Twitter: @GAFrontPage

New Lighting Guidelines for Jekyll Island Beaches to Protect Endangered Sea Turtles

NF Note: Please remember "no lights on the beach" during nesting season for the sea turtles. These animals are amazing and they can use all the help we can give them.

PRNewswire/ -- The Jekyll Island State Park Authority (JIA) today announced it's intentions to set greater restrictions on lights near its natural beaches in order to protect sea turtles from the adverse effects of artificial light. The move, once approved as a new ordinance for the state-owned island, will likely be the model for beach lighting ordinances for all of Georgia's coast communities.

Artificial lighting is the light that emanates from any man-made device, such as street-lights, tree lights, beach-walk lanterns, and neon signs. This new ordinance, which strictly defines what will and will not be allowed on and near the beach, will be regulated and enforced by the JIA.

"Jekyll Island is well-known for its conservation efforts, especially through the work of the Georgia Sea Turtle Center," said Ben Porter, chairman of the Jekyll Island State Park Authority. "This is another big step towards making Jekyll Island one of the most environmentally-friendly communities on the East Coast."

The new ordinance was developed in conjunction with the Georgia Department of Natural Resources with vital input from the experts at the Georgia Sea Turtle Center. Once approved, illumination of certain beaches will be prohibited at nighttime during the sea turtle nesting season for the protection of the nesting females and hatchling sea turtles making their way into the sea. Oftentimes hatchlings will confuse artificial lighting with the reflection of the moon, which they use as a marker to get to the ocean once they hatch.

"We were pleased to see the Jekyll Island Authority take the lead in placing these restrictions into an enforceable ordinance," said Noel Holcomb, Commissioner of the Department of Natural Resources. "As Chairman of the Shore Protection Committee, I will promote the standards within this ordinance to the Shore Protection Committee as we consider beachfront projects for permitting under the Shore Protection Act."

Lighting may still be operated during the nesting season if the light, or reflection, is not directly visible from the beach. But the majority of the lights will be low-intensity lighting, such as amber or red LEDs, red neon lights and "Turtle Safe Lighting," which are coated and compact florescent lamps under 13 watts. Additionally, the ordinance states that tinting will be installed on all windows and glass doors within line-of-sight of the beach.

The new ordinance was announced by the Jekyll Island Authority at its regular meeting on Monday. The "first reading" of any new ordinance must be posted for public review, anyone interested in reading the proposed ordinance language can view it on the Authority's Web site at www.jekyllislandauthority.org . The Jekyll Island Authority is expected to adopt the new ordinance at its regular meeting in August.