{"id":441555,"date":"2026-04-27T05:39:08","date_gmt":"2026-04-27T12:39:08","guid":{"rendered":"https:\/\/climatescience.press\/?p=441555"},"modified":"2026-04-27T05:39:10","modified_gmt":"2026-04-27T12:39:10","slug":"first-detection-of-askaryan-radiation-deep-in-antarctic-ice-from-cosmic-ray-showers","status":"publish","type":"post","link":"https:\/\/climatescience.press\/?p=441555","title":{"rendered":"First Detection of Askaryan Radiation Deep in Antarctic Ice from Cosmic Ray Showers"},"content":{"rendered":"
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A detector from the Askaryan Radio Array (ARA) <\/strong>near the South Pole captured 13 distinct impulsive radio bursts<\/strong> during a 208-day observation period in 2019 (using just one station). These signals originated from below the ice surface and have now been reanalyzed and confirmed as Askaryan radiation<\/strong>\u2014coherent radio waves emitted by particle cascades in the ice.<\/p>\n\n\n\n

The Askaryan effect (also called Askaryan radiation) <\/strong>is a powerful, coherent radio-frequency emission produced when an ultra-high-energy particle creates a dense electromagnetic shower in a transparent dielectric medium such as Antarctic ice, rock salt, or silica.<\/p>\n\n\n\n

Physicist Gurgen Askaryan predicted it in 1962. It is now the cornerstone of radio-detection techniques for ultra-high-energy neutrinos and cosmic rays.<\/p>\n\n\n\n

In 1962, physicist Gurgen Askaryan<\/strong> predicted that when a high-energy particle (like a cosmic-ray proton or nucleus) slams into dense matter such as ice, it triggers a shower of secondary particles. In this shower, a slight excess of negative charge builds up (electrons outnumber positrons slightly due to scattering and annihilation effects). This moving charge excess produces a brief, powerful pulse of radio waves <\/strong>(in the ~100 MHz to GHz range) via the Askaryan effect<\/strong>\u2014essentially Cherenkov-like radiation but in radio frequencies, coherent and thus amplified at certain wavelengths.<\/p>\n\n\n\n

This effect was previously observed in labs and in the atmosphere, but detecting it in situ within Antarctic ice proved technically challenging due to the need for buried antennas, low noise, and precise triggering.<\/p>\n\n\n\n

The Askaryan Radio Array (ARA) <\/strong>embeds radio antennas deep in the ice at the South Pole. Its primary goal is hunting ultra-high-energy (UHE) cosmic neutrinos<\/strong>\u2014ghostly particles that could reveal the origins of the universe’s most energetic cosmic rays. Neutrinos interact rarely, so radio detection in vast volumes of transparent ice (where radio waves travel kilometers with little attenuation) offers a scalable way to monitor huge effective volumes cheaply compared to optical detectors like IceCube.<\/p>\n\n\n\n

Cosmic rays hitting the atmosphere create air showers whose cores can penetrate and interact in the upper ice layers, producing similar radio pulses. These serve as a background<\/strong> for neutrino searches but also a perfect calibration source<\/strong>. The 13 events matched predictions in:<\/p>\n\n\n\n