The Harwell–Grove radio installation for detecting EAS at low elevation, over a 9 km base line

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Abstract
The paper describes an installation set up to investigate the problems of detecting EAS by wholly radio methods. This installation is divided between two stations 9 km apart. At each station local coincidences are taken between two large corner reflector antennas sited 130 m apart, the effective beamwidth in azimuth being ~ 30°. The Harwell station is operational and includes photographic recording of the radio outputs on 5 μs time bases, and considerable monitoring on chart recorders. The Grove station is at present only partially complete.Preliminary results obtained so far reveal that there are broadly three classes of events: (a) pulses which are strictly bandwidth-limited and are attributed largely to random coincidences from sky-noise; (b) pulses of duration ~ 200–400 ns which have steep rise and fall characteristics and which, like those in (a), are "single"; and (c) multiple pulses with fine structure for at least 5 μs. The events in class (b), which disappear when 1 μs delay is inserted in one channel, can possibly be attributed to EAS. The (c) pulses are suspected to arise from distant electrical storms.

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