Radio Detection of High-Energy Cosmic Rays: LOPES
Abstract
The detection of radio pulses emitted in the atmosphere during the air shower development of high-energy primary cosmic rays is the task of the LOPES (LOFAR Prototype Station) project. LOFAR (Low Frequency Array) is a new digital radio interferometer under development using high bandwidth ADCs and fast data processing to filter out most of the interference. By storing the whole waveform information in digital form transient events like air showers can be analyzed even after they have been recorded. To test this technology and to demonstrate its ability to measure air showers a LOPES is set up to operate in conjunction with an existing air shower experiment (KASCADE-Grande). The LOPES antennas are operating in the frequency range of 40-80 MHz. For several air-shower events a coincident and coherent signal has been found and a preliminary analysis has already been performed. The main goal of further investigations is to calibrate the radio signal with help of the observables of the individual air-showers given by KASCADE-Grande.
- Publication:
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22nd Texas Symposium on Relativistic Astrophysics
- Pub Date:
- 2005
- Bibcode:
- 2005tsra.conf..687H