Antarctic Impulsive Transient Antenna (ANITA) is a radio telescope instrument to detect ultra-high energy cosmic-ray neutrinos from a scientific balloon flying over the continent of Antarctica.
It involves an array of radio antennas attached to a helium balloon which flies over the Antarctic ice sheet at 37,000 meters.
At such a height, the antennas can listen to the cosmos and detect high-energy particles, known as neutrinos, which constantly bombard the planet.
It is the first NASA observatory for neutrinos of any kind.
ANITA detects neutrinos pinging in from space and colliding with matter in the Antarctic ice sheet through the Askaryan effect.
Recently, NASA’s Antarctic Impulsive Transient Antenna (ANITA) has detected the unusual upward movement of neutrinos in Antarctica.
Instead of the high-energy neutrinos streaming in from space, they seem to have come from the Earth’s interior, before hitting the detectors of ANITA.
Usually, the high-energy particles move top to bottom (i.e. from space to the earth).
However, ANITA has detected an anomaly i.e. particles have been detected travelling bottom to top.
