The European Space Agency (ESA) acted on Wednesday for an official announcement of the termination of the mission’s biggest civilian satellite, spacecraft Envisat, which was launched in 2002, according to RIA Novosti.
According to data presented at the site office, the staff of ESA’s completely lost touch with the unit in April this year, but is still trying to recover the satellite.
Among the many proposed causes of sudden loss of communication with the Envisat engineers isolated power supply failure of the stabilizer, which could lead to blocking receive commands and transmit information. Another version of a short circuit, which could cause the satellite to go into a special mode or security mode, designed primarily to increase the life of the machine. Meanwhile, the transition to this mode could cause a software failure, stop the satellite equipment.
Mass of the satellite Envisat - eight tons, are on board its 10 scientific instruments, which include radars, radiometers designed to measure the temperature. Over its lifetime, the satellite orbited around the planet 50,000 times, passing the scientists a wealth of valuable information.
So, with the help of this comic device, researchers were able to estimate the supply of fresh water in the Arctic Ocean, to watch the process of the evolution of ice shelves in Antarctica. These satellites in most cases used to determine the extent of the oil spill, as well as for many other purposes.
Now, Envisat has become a "veteran" as early as two times higher than the lifetime, the scientists initially planned. However, according to calculations by ESA satellite had to work up to the end of 2014.
In place of this spacecraft will come the first two satellites of new generation, belonging to the European system of GMES (Global Monitoring for Environment and Security).