Space

September 2, 2014

NASA probes studying Earth’s radiation belts celebrate two year anniversary

This image was created using data from the Relativistic Electron-Proton Telescopes on NASA’s twin Van Allen Probes. It shows the emergence of a new third transient radiation belt. The new belt is seen as the middle orange and red arc of the three seen on each side of the Earth.

Twin Van Allen Probes celebrated Aug. 30 two years of studying the sunís influence on our planet and near-Earth space. The probes, shortly after launch in August 2012, discovered a third radiation belt around Earth when only two had previously been detected.

The radiation belts are layers of energetic charged particles held in place by the magnetic field surrounding our planet. The new third belt occurred only occasionally but persisted for as long as a month. This revealed to scientists the dynamic and variable nature of the radiation belts and provided new insight into how they respond to solar activity.

“The primary science objective of the Van Allen Probes is to provide understanding of how particles in the radiation belts form and change in response to energy input from the sun,” said Mona Kessel, the missionís program scientist at NASA Headquarters in Washington. “The discoveries and understanding gained have far exceeded expectations.”

The probes, each weighing just less than 1,500 pounds, were specifically designed to withstand and study the harsh radiation belt region around Earth. The belts are critical regions that have a connection to Earthís atmosphere and space-based technologies. The belts are affected by solar storms and space weather events and as a result, can swell dramatically. When this occurs, they can pose dangers to communications and GPS satellites, as well as humans in low-Earth orbit.

Formerly known as the Radiation Belt Storm Probes, the mission was renamed Van Allen Probes in November 2012 in honor of Dr. James Van Allen, who discovered the two radiation belts in 1958.

The twin spacecraft have also revealed how particles in the heart of the belts can be accelerated to nearly the speed of light; proven that electrons in the belts are undergoing acceleration from very low frequency plasma waves; and shown persistent stripe-like structures are a common feature of the inner belt, and are caused by Earthís rotation, a mechanism previously thought to be incapable of such an effect.

The Van Allen Probes mission has given us the means to validate theories about plasma physics and the acceleration processes going on inside the belts, said Barry Mauk, Van Allen Probes project scientist at the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland. They also have shown us new structures and features in this region of space, the existence of which we had never suspected. It has been a very illuminating two years, and we look forward to many more with these remarkable spacecraft.

The Van Allen Probes are the second mission in NASA’s Living With a Star (LWS) Program to explore aspects of the connected sun-Earth system that directly affect life and society. LWS is managed by the agency’s Goddard Space Flight Center in Greenbelt, Maryland. APL built the spacecraft and manages the mission for the agencyís Science Mission Directorate in Washington.




All of this week's top headlines to your email every Friday.


 
 

 

Headlines September 19, 2014

News: McKeon on broader military authorization: Anything can ‘fail or pass’ - Rep. Howard “Buck” McKeon, R-Calif., chairman of the House Armed Services Committee, said if Congress returns after the midterm elections to weigh a broader military authorization for the battle against Islamic State, it might not pass. Defense contractor gets 7 years for giving secrets...
 
 

News Briefs September 19, 2014

U.S. military deaths in Afghanistan at 2,203 As of Sept. 16, 2014, at least 2,203 members of the U.S. military had died in Afghanistan as a result of the U.S.-led invasion of Afghanistan in late 2001, according to an Associated Press count. At least 1,823 military service members have died in Afghanistan as a result...
 
 

Pratt & Whitney, U.S. Air Force complete qualification for F135 engine testing

Pratt & Whitney, a United Technologies Corp. , together with its U.S. Air Force partner at the F135 Heavy Maintenance Center at Tinker Air Force Base, Okla., celebrated another significant milestone qualification for F135 engine testing at the Oklahoma City Air Logistics Complex. OC-ALC which in addition to engine testing is also qualified to perform...
 

 
Navy photograph

Triton has first cross-country flight from Palmdale

Northrop Grumman photograph The MQ-4C Triton Unmanned Aircraft System takes off from Northrop Grummanís Palmdale, Calif., facility Sept. 17 for its first cross-country flight to Naval Air Station Patuxent, River, Md. PALMDALE,...
 
 
Air Force photograph by Michael J. Pausic

Future of NATO: Adapting to a new security environment

Air Force photograph by Michael J. Pausic Gen. Phillip Breedlove informs the assembled crowd about the results of the recent NATO Summit and the areas of instability that affect Europe that have regional implications. Seated in...
 
 
Air Force photograph by Scott M. Ash

AFRL commander describes Air Force’s technology vision

Air Force photograph by Scott M. Ash Maj. Gen. Thomas Masiello takes a question from an audience member after discussing Air Force Research Laboratory breakthrough technologies during the 2014 Air Force Association’s Air ...
 




0 Comments


Be the first to comment!


Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>