Radio emission of extensive air shower at CODALEMA: Polarization of the radio emission along the v*B vector

TL;DR

This paper investigates the polarization and emission mechanism of radio signals from extensive air showers caused by cosmic rays, providing evidence for a linear relation between electric field and the v*B vector, advancing detection methods.

Contribution

It presents new evidence supporting the linear relationship between radio emission polarization and the v*B vector in cosmic ray air showers.

Findings

Confirmed linear relation between electric field and v*B vector.

Provided insights into the physical origin of radio emission polarization.

Supported the use of radio detection for high-energy cosmic rays.

Abstract

Cosmic rays extensive air showers (EAS) are associated with transient radio emission, which could provide an efficient new detection method of high energy cosmic rays, combining a calorimetric measurement with a high duty cycle. The CODALEMA experiment, installed at the Radio Observatory in Nancay, France, is investigating this phenomenon in the 10^17 eV region. One challenging point is the understanding of the radio emission mechanism. A first observation indicating a linear relation between the electric field produced and the cross product of the shower axis with the geomagnetic field direction has been presented (B. Revenu, this conference). We will present here other strong evidences for this linear relationship, and some hints on its physical origin.