ИСТИНА

The proposal to use ground based radio telescopes for detection of Askaryan radio pulses from particle cascades arising when the extremely high-energy (EHE >1020 eV) cosmic rays (including neutrinos) interact with the lunar regolith of multi gigaton mass had been made in the end of 80th in the framework of the Russian (Soviet) DUMAND Program. During more than a quarter of century a number of lunar experiments were carried out mainly in 1-3 GHz frequency range using the large radio telescopes of Australia, USA, Russia and other countries but these experiments put only the upper limits to the EHE cosmic rays fluxes. For this reason, it would be of the great interest to search for nanosecond radio pulses from the Moon in a wider interval of frequencies (including lower ones of 100 - 350 MHz) with larger radio detectors – for example the giant radio telescope SKA (Square Kilometer Array) which is constructed in Australia, New Zeeland and South Africa. In this paper there are discussed possibilities to use one of the most sensitive meter-wavelength (~110 MHz) Large Phased Array (LPA) of 187x384 m2 and the wide field of view meter-wavelength array of the Pushchino Radio Astronomy Observatory as prototypes of low frequency radio detectors for lunar experiments. The new scheme for fast simulation of ultrahigh and extremely high-energy cascades in dense media is also suggested. This scheme will be used later for calculations of radio emission of cascades in the lunar regolith with energies up to 1020 eV and higher in the wide frequency band of `0.1 – a few GHz.