Author/Authors :
Schellart، نويسنده , , P. and Buitink، نويسنده , , S. and Corstanje، نويسنده , , Jeanette A. Thurston-Enriquez، نويسنده , , J.E. and Falcke، نويسنده , , H. and Frieswijk، نويسنده , , W. and Hِrandel، نويسنده , , J.R. and Krause، نويسنده , , M. and Nelles، نويسنده , , A. and Scholten، نويسنده , , O. and ter Veen، نويسنده , , S. and Thoudam، نويسنده , , S. and van den Akker، نويسنده , , M.، نويسنده ,
Abstract :
LOFAR, the Low Frequency Array, is currently the worldʹs largest distributed radio telescope observing at frequencies below 240 MHz. LOFAR is measuring cosmic-ray induced air-showers since June 2011 and has collected several hundreds of events with hundreds of antennas per individual event. We present measurements of the radio signal strength as well as high-precision measurements of wavefront curvature and polarization. These will enable us to disentangle the different emission mechanisms at play, such as geomagnetic radiation, charge excess, and Askaryan or Cherenkov effects, leading to a full understanding of the air-shower radio emission. Furthermore we give a first example on how the full complexity of the signal enables radio measurements to be used to study primary particle composition.
