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Askaryan radiation

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The Askaryan radiation[1][2] also known as Askaryan effect is the phenomenon whereby a particle traveling faster than the phase velocity of light in a dense dielectric such as salt, ice or the lunar regolith produces a shower of secondary charged particles which contain a charge anisotropy and thus emits a cone of coherent radiation in the radio or microwave part of the electromagnetic spectrum It is similar to the Cherenkov radiation It is named after Gurgen Askaryan, a Soviet-Armenian physicist who postulated it in 1962

The radiation was first observed experimentally in 2000, 38 years after its theoretical prediction So far the effect has been observed in silica sand,[3] rock salt,[4] ice,[5] and Earth's atmosphere[6]

The effect is of primary interest in using bulk matter to detect ultra-high energy neutrinos The Antarctic Impulse Transient Antenna ANITA experiment uses antennas attached to a balloon flying over Antarctica to detect the Askaryan radiation produced as cosmic neutrinos travel through the ice[7][8] Several experiments have also used the Moon as a neutrino detector based on detection of the Askaryan radiation[9][10][11][12]

See also

  • Cherenkov radiation


  1. ^ https://arxivorg/abs/160504975
  2. ^ https://arxivorg/abs/11066283
  3. ^ Observation of the Askaryan Effect in Silica Sand
  4. ^ Observation of the Askaryan radiation in Rock Salt
  5. ^ Observation of the Askaryan Effect in Ice
  6. ^ A large light-mass component of cosmic rays at 1017–10175 electronvolts from radio observations
  7. ^ ANITA Project Overview
  8. ^ ARIANNA collaboration
  9. ^ GLUE project
  10. ^ NuMoon project
  11. ^ LUNASKA project
  12. ^ RESUN project

External links

  • RADHEP-2000 Write-ups

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