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NASA's Radiation Belt Storm Probes Ready for Space Environment Tests
The RBSP team at the Johns Hopkins University Applied Physics Laboratory, shown here in late November, performs final inspections and testing on spacecraft A's solar arrays and one of the mission's five scientific instruments before the satellites head into acoustic testing. Credit: JHU/APL
NASA's Radiation Belt Storm Probes (RBSP) will soon enter a challenging series of tests to certify they are ready for their August 2012 launch and two-year mission in Earth’s orbit. The two RBSP spacecraft will probe Earth's radiation belts, two bands of charged particles encircling our planet that can respond dramatically to increased radiation and energy from the sun causing space weather that can affect spacecraft and other man-made technologies.
During the space environment test campaign, the RBSP team at the Johns Hopkins University Applied Physics Laboratory in Laurel, Md. will subject the spacecraft to physical simulations of the stresses of launch and harshness of space operations, but in a controlled test facility where engineers can monitor the spacecrafts’ conditions. The tests will begin the first week in December and will last into March 2012.
"These are complex spacecraft, each with five very sensitive scientific instruments on board," says Jim Stratton, mission systems engineer for RBSP at the Applied Physics Lab. "The environmental tests are designed to really subject the spacecraft and systems to realistic, challenging conditions and make sure they are ready to fly."
The first test will simulate the incredibly loud noises generated during launch and the beginning of supersonic travel, when the launch vehicle passes through the sound barrier (approximately 770 miles per hour). These sounds, which can reach a maximum of 134 decibels (nearly as loud as a jet engine from 100 feet away), will be duplicated by a specialized speaker system that is controlled via computer to match the sonic profiles of launch and supersonic barrier breakthrough. The RBSP satellites will be mated together and placed at the center of a circular wall of powerful loudspeakers for this test. One of the substantial challenges for the probes is that they must survive launch as a single unit; later, above Earth, they will be separated and guided to their individual orbits.
RBSP will next undergo a vibration test. The spacecraft are mated together again and placed on a special table that will shake them to simulate the intense physical effects of launch, and make sure the probes’ systems and electronics are secure and will operate post-launch.
In January 2012, the spacecraft will undergo an electromagnetic compatibility and interference test. This involves turning on all of the spacecrafts’ internal systems without any external power or grounding to verify there are no electronic issues, and that RBSP can successfully perform its science-gathering mission.
RBSP will enter thermal vacuum testing in APL’s test chambers in February. For five weeks, the craft will endure heating and cooling cycles in a vacuum environment; during the lengthy testing, RBSP will also undergo a 10 day-long mission simulation. After that, in May 2012, the completed RBSP spacecraft are scheduled to leave APL and travel south.
"This is an exciting time for the RBSP program," says David Sibeck the project scientist for RBSP at NASA’s Goddard Space Flight Center in Greenbelt, Md. "APL is making sure the spacecraft are ready for flight and we’re looking forward to the launch next year. RBSP will provide the first multi-point measurements of this little-explored region — a region that responds to energy from the sun in often dramatic ways that we don't yet understand."
RBSP is scheduled for launch no earlier than Aug. 15, 2012, from the Kennedy Space Center, Fla. APL is building the RBSP spacecraft for NASA and will manage the mission. The RBSP mission is part of NASA's Living With a Star program, guided by the Heliophysics Division of the NASA Headquarters Science Mission Directorate in Washington. The program explores fundamental processes that operate throughout the solar system, in particular those that generate hazardous space weather effects near Earth and phenomena that could affect solar system exploration. Living With a Star is managed by NASA's Goddard Space Flight Center in Greenbelt, Md.
Learn more about the Radiation Belt Storm Probes, and see photos and videos of space environment testing, at:
For NASA mission status updates on RBSP, visit:
Geoffrey Brown and Karen C. Fox
Applied Physics Laboratory / NASA Goddard Space Flight Center