INVESTIGADORES
MARIAZZI Analisa Gabriela
artículos
Título:
Probing the radio emission from air showers with polarization measurements
Autor/es:
PIERRE AUGER COLLABORATION (A. AAB, ... , A. MARIAZZI, ET AL)
Revista:
PHYSICAL REVIEW D - PARTICLE AND FILDS
Editorial:
American Physical Society
Referencias:
Año: 2014 vol. 89 p. 52002 - 52002
ISSN:
0556-2821
Resumen:
The emission of radio waves from air
showers has been attributed to the so-called geomagnetic emission
process. At frequencies around 50 MHz this process leads to coherent
radiation which can be observed with rather simple setups. The direction
of the electric field induced by this emission process depends only on
the local magnetic field vector and on the incoming direction of the air
shower. We report on measurements of the electric field vector where,
in addition to this geomagnetic component, another component has been
observed that cannot be described by the geomagnetic emission process.
The data provide strong evidence that the other electric field component
is polarized radially with respect to the shower axis, in agreement
with predictions made by Askaryan who described radio emission from
particle showers due to a negative charge excess in the front of the
shower. Our results are compared to calculations which include the
radiation mechanism induced by this charge-excess process.