Radio detection of cosmic ray air showers in the digital era
T. Huege (KIT)

TL;DR
The paper reviews the progress and current state of digital radio detection of cosmic ray air showers, highlighting advances in physics understanding, experimental setups, and potential future applications in cosmic ray physics.
Contribution
It provides a comprehensive overview of the last decade's developments in digital radio detection experiments and discusses the physics, results, and future prospects of the technique.
Findings
Radio detection experiments now cover areas up to 17 km².
Physics of radio emission in air showers is well understood.
Radio signals can accurately determine cosmic ray parameters.
Abstract
In 1965 it was discovered that cosmic ray air showers emit impulsive radio signals at frequencies below 100 MHz. After a period of intense research in the 1960s and 1970s, however, interest in the detection technique faded almost completely. With the availability of powerful digital signal processing techniques, new attempts at measuring cosmic ray air showers via their radio emission were started at the beginning of the new millennium. Starting with modest, small-scale digital prototype setups, the field has evolved, matured and grown very significantly in the past decade. Today's second-generation digital radio detection experiments consist of up to hundreds of radio antennas or cover areas of up to 17 km. We understand the physics of the radio emission in extensive air showers in detail and have developed analysis strategies to accurately derive from radio signals parameters…
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