ANITAIV
ANITA-IV refers to the fourth long-duration balloon mission in NASA’s Antarctic Impulsive Transient Antenna (ANITA) program. The mission built on a series of balloon-borne radio detectors designed to observe nanosecond radio impulses produced by high-energy particle cascades in Antarctic ice or in the atmosphere. ANITA-IV conducted a circumpolar flight over Antarctica, carrying a polar array of horn antennas that detected broad-band radio signals in the 200–1200 MHz range, triggered by impulsive events characteristic of the Askaryan effect and extensive air showers from cosmic rays.
The instrument combined a high-gain, wide-field antenna system with fast data acquisition and calibration subsystems to
Results and impact: ANITA-IV did not yield a confirmed detection of ultra-high-energy neutrinos during its flight,