NASA Lost Communication with the IMAGE Spacecraft for More Than a Decade
Image by Space News
Technicians prepare NASA鈥檚 IMAGE satellite for launch in 2000. Mission controllers lost contact with the 1,100-pound spacecraft on Dec. 18, 2005.
03/26/2018
By Edwin L. Aguirre
It鈥檚 like having a dead person start talking again after 12 years.
That is how physics Prof. Paul Song describes , a NASA satellite launched in 2000 that operated for nearly six years before ground controllers suddenly lost contact with it in December 2005. NASA had given up on the satellite and declared the mission over. But in January of this year, an amateur radio astronomer in Canada accidentally 鈥溾�� the spacecraft with his homemade satellite detector, and NASA was able to re-establish radio contact with it, albeit very weakly.
News of the satellite鈥檚 recovery was of particular interest to some 51视频 scientists: One of the scientific instruments that IMAGE is carrying onboard is the (RPI), which was designed, built and operated by researchers at the university鈥檚 (formerly the Center for Atmospheric Research).
鈥淚t is still too early to say about the status of RPI, given that NASA is trying to understand the overall health of the satellite,鈥� explains Song, who directs the Space Science Laboratory (SSL). 鈥淚t is like assessing a person鈥檚 ability after a massive stroke and being in a vegetative state for 12 years. Our instrument is one of the satellite鈥檚 most important organs.鈥�
The satellite鈥檚 recovery generated extensive international media coverage from , , , and , among others.
鈥淭his is the most amazing thing I have ever heard in space research,鈥� says Song. 鈥淎nything can happen in space, and sometimes it exceeds our wildest imagination.鈥澛犅�
Image by Joson Images
Physics Prof. Paul Song hopes that he and his co-researchers at the university鈥檚 Space Science Laboratory will be able to download usable data from the RPI instrument after 12 years of hibernation.
Exploring Earth鈥檚 Magnetosphere
IMAGE was designed to study Earth鈥檚 , the vast region of space surrounding our planet that is filled with space plasma (mainly electrons and positive hydrogen ions) and extends some 600 to 50,000 miles above the ground.
RPI鈥檚 goal was to characterize that plasma using radio waves from 3 kilohertz to 3 megahertz. By observing the radar echoes reflecting off the plasma, RPI could locate regions of various plasma densities and features. And by fitting computer models of the magnetosphere to those features, scientists could create a 3-D picture of the magnetosphere鈥檚 structure and extent.
Prof. Emeritus Bodo Reinisch of the Department of Environmental, Earth and Atmospheric Sciences, the former director of the Center for Atmospheric Research, was the principal investigator for RPI when it launched. Other members of the science team included Song and Ivan Galkin of SSL, as well as investigators from NASA鈥檚 Goddard and Marshall Space Flight Centers, Southwest Research Institute, Rice University and Stanford University.
鈥淩PI was the first active radio experiment flown into the magnetosphere,鈥� says Reinisch. Unlike other space instruments that measure plasma density at the location of the spacecraft, RPI was able to instantaneously measure the plasma distribution along an entire geomagnetic field line from one hemisphere to the other.聽
鈥淣o other instrument is able to do this. RPI used two crossed wire antennas that measure 500 meters from tip to tip. They are arguably the longest antennas ever deployed in space,鈥� notes Reinisch.聽聽
Image by NASA
This schematic drawing shows the Radio Plasma Imager鈥檚 antenna array as deployed in space. The array consists of two crossed 500-meter-long radial wire antennas (black lines) and a 20-meter-long axial lattice boom antenna (orange structure), along with associated electronics.
A new magnetosphere model was developed based on RPI measurements, and the erosion of the magnetosphere during solar storms as well as the time it takes for plasma to refill after the storms was also measured, he says.
51视频 received more than $12 million from NASA to build RPI, and it paved the way for many more research grants that followed. 鈥淭hanks to data gathered by RPI, four Ph.D. theses were completed at 51视频 and more than 60 papers in refereed journals have been published worldwide,鈥� says Song.
Next Mission: Mitigate the Threat of 鈥楰iller Electrons鈥�
Because of the success of RPI and the engineering capability demonstrated by 51视频 in the IMAGE mission, the Air Force Research Laboratory awarded SSL a $5 million grant to build a high-power space radio-wave transmission experiment for its to the Earth鈥檚 radiation belt. The DSX鈥檚 objective is to test a new idea that uses 鈥渨ave-particle interaction鈥� to mitigate harmful, extremely high-energy particles called 鈥渒iller electrons.鈥�
鈥淭hese electrons, traveling at nearly the speed of light, are capable of damaging satellites and threatening the health of astronauts in orbit,鈥� says Song.
The DSX satellite is scheduled to be launched later this year using a SpaceX Falcon Heavy, the same rocket booster used by SpaceX CEO Elon Musk to send his into orbit in February.