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- W3146099524 abstract "Cosmic ray air showers are known to emit pulsed radio emission at frequencies around a few tens of MHz. Accompanying the experimental efforts of the LOPES project, situated at the KASCADE-Grande site of the Forschungszentrum Karlsruhe, we have modeled the underlying emission mechanism in the scheme of coherent geosynchrotron radiation from electron-positron pairs deected in the earth’s magnetic eld. As a follow-up to our earlier analytical calculations, we have developed a Monte Carlo simulation based on analytic parametrisations of air shower properties, including longitudinal and lateral particle distributions, particle energy and track-length distributions, and the longitudinal shower development as a whole. Here we present detailed simulation results. Important ndings are the absence of signicant asymmetries in the total eld strength emission pattern in spite of the asymmetry introduced by the geomagnetic eld, the polarisation characteristics of the geosynchrotron emission, allowing an unambiguous test of the geomagnetic emission mechanism, and the dependence of the radio emission on important shower parameters such as the shower zenith angle, the primary particle energy and the depth of the shower maximum. As a particularly useful result, these dependences have been summarized in a simple parametrisation formula, providing a solid basis for the interpretation of experimental data gathered with current and future experiments. Radio emission from extensive air showers (EAS) has been known to exist since its initial discovery in the 1960ies. Today’s digital signal processing capabilities led to the idea of using digital radio interferometers such as LOFAR for its observation [1]. These considerations sparked the LOPES project situated at the KASCADEGrande site of the Forschungszentrum Karlsruhe in Germany, with the intention to develop a prototype for the measurement of radio emission from EAS based on LOFAR hardware. In the meantime, LOPES has successfully delivered proof-of-principle results conrming a geomagnetic origin of the emission [2]. In conjunction with the plans for an experimental design, a new approach for the interpretation of the emission mechanism was proposed [1]. In this approach, the emission is interpreted as coherent geosynchrotron radiation arising from the deection of the air shower cascade’s secondary electron-positron pairs in the earth’s magnetic eld. Following this concept, we have carried out analytical calculations [3], followed by detailed Monte Carlo simulations [4] of the radio emission from cosmic ray air showers. The Monte Carlo simulations are based on an air shower model describing important shower properties such as the longitudinal and lateral particle distributions, the particle energy and track-length distributions and the overall longitudinal development of the air shower cascade with realistic, widely-used parametrisation formulas such as NKG-functions and Greisenparametrisations, reaching a hitherto unprecedented level of detail in the simulations. Having veried the consistency of the analytical and Monte Carlo simulations, we now present a number of important results for the radio emission’s dependence on specic air shower properties derived with this Monte Carlo model. A more complete discussion of these results can be found in [5]." @default.
- W3146099524 created "2021-04-13" @default.
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- W3146099524 date "2005-01-01" @default.
- W3146099524 modified "2023-09-23" @default.
- W3146099524 title "Simulations and parametrisation of radio emission from cosmic ray air showers" @default.
- W3146099524 hasPublicationYear "2005" @default.
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