Each mission lasts for one month, and the polar cycle floats with the wind (not the current). Usually within two years between missions, the latest one is Anita-III (formerly called Anita-I, Anita-II), which has been upgraded to 48 corner antennas. Neutrino is a very strange particle, which hardly acts on any substance and penetrates directly. No charge, small mass, no strong interaction, only interaction and gravity, small interaction and light particles, so it is a difficult problem to detect it!
This discovery began when the Antarctic transient pulse antenna (ANITA) detected very high-energy neutrinos. ANITA is different from other neutrino detectors in that it is a wireless antenna array suspended on a helium balloon at an altitude of 37,000 meters, which can detect the wireless signal of ultra-high energy neutrinos hitting the ice sheet. Anita found a strange signal, which seems to be triggered by neutrinos, but it has high energy and seems to violate the physical theory. The researchers also looked at the data of the IceCube Neutrino Observatory, which detected that thousands of photodetectors were deployed about 1.5 km under the Antarctic ice, and detected the Cherenkov light released by neutrinos and ice.
The ice cube is insensitive to Anita, but it provides the general direction of high-energy neutrinos. After analyzing about 50 neutrino events in the ice cube, the research team speculated that they were emitted by bright quasars. To prove this idea, they consulted the observation data of Russian RATAN-600 wireless telescope. Quasars can detect neutrinos when they find wireless flash sparks. Researchers believe that when quasars are particularly active, gamma ray explosions and flash sparks will occur, and if gamma rays collide with surrounding atoms, neutrino explosions will be triggered. Neutrinos travel at nearly the speed of light, so they reach the earth almost at the same time as the radio explosion. So I think the supermassive black hole of quasars is the source of high-energy neutrinos.