BEXCO - Room F(201/202/203/204)
[CRI104] Direct measurement of the vertical component of the electric field from EAS
- Richard DALLIER
- Richard DALLIER (Subatech and Unité Scientifique de Nançay)
A three-fold antenna system has been installed nearby the center of the CODALEMA particle detector. Its goal is to measure the complete electric field produced by air showers, i.e. along the 3 polarizations EW, NS and vertical. Indeed on all currently operating radio detection arrays, only the horizontal NS and EW polarizations or their projections are measured. This allows the vertical electric field component to be reconstructed, provided that the far-field assumption is valid, but though strong hints based on the theories of air shower radio emission tend to validate this hypothesis, it has never been verified experimentally. We present the 3D antenna and its acquisition system, and the first results obtained allowing one to derive conclusions about the initial hypothesis.