Two main emission mechanisms have been proposed in the past for radio emission from EAS: Cherenkov radiation from a charge excess moving with a velocity higher than the speed of light in the traversed medium (the so-called “Askaryan” mechanism motivated by Askaryan 1962; Askaryan 1965) and acceleration of charged particles in the earth’s magnetic field.

While the former is dominant in case of dense media (Buniy & Ralston 2002; Zas et al. 1992; Alvarez-Muniz et al. 2000), polarisation measurements in a number of experiments subsequently supported the dominance of the geomagnetic emission mechanism for radio emission from EAS in air (e.g., Allan et al. 1969). It also seems unavoidable in principle for highly relativistic charged particles moving in the earth’s magnetic field.

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