Radioastronomical measurement of ultrahigh-energy cosmic particle fluxes

The basic principles underlying the radio telescope measurement of ultrahigh-energy particle fluxes are reviewed. Experimental lunar regolith emission data are presented for the $10^{20}$ eV energy range. Some conclusions from theoretical work are discussed, as is the influence of a number of factors on the intensity of the radio pulse due to the cascade disk under the Moon's surface.