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Simulation aids the search for the origin of cosmic rays by Julia Weiler Bochum, Germany (SPX) Sep 15, 2022
Cosmic rays seem to surround us everywhere. This is precisely what makes it difficult to find its sources. It would be helpful if we could trace their path through space. A new programme can help. An international research team has developed a computer programme that can simulate the transport of cosmic rays through space. The researchers hope it will help them solve the mystery of the sources of cosmic rays. So far, we do not know which celestial objects emit the high-energy radiation that pelts the Earth from space. Theoretical models are necessary to explain experimental data; the new computer simulation can provide these. A team of researchers from Ruhr-Universitat Bochum (RUB) describes the software in the Journal of Cosmology and Astroparticle Physics, published online on 12 September 2022.
Like an evenly illuminated sky during daytime
Particle trajectories simulated all the way from production to detection The programme can simulate not only cosmic ray propagation, but also signatures of neutrinos and gamma rays that are produced in cosmic ray interactions. "Unlike cosmic rays, these messenger particles can be observed directly from their sources, as they come to Earth on a straight path," explains Dr. Patrick Reichherzer, postdoctoral researcher at RUB. "We can also use the software to predict such signatures from neutrinos and gamma rays from distant galaxies such as starbursts or active galaxies." The presented simulation programme is currently the most comprehensive software and opens up new windows to the Universe. "We can explore new energy ranges in the simulation that couldn't fully be captured in such detail with the programmes available to date," says Professor Karl-Heinz Kampert from the University of Wuppertal. "Most importantly, we can develop a theoretical model that describes the transition from cosmic rays from our own Galaxy to a fraction coming from distant galaxies and compare it with observations."
Theoretical calculations essential to interpret experimental data CRC spokesperson Professor Julia Tjus from the RUB points out: "The publication is a major step towards a quantitative description of the transport and interaction of cosmic rays in three dimensions. CRPropa will significantly contribute to understanding where cosmic rays come from. After all, we need theoretical calculations to help us interpret the variety of data we receive from the various instruments monitoring the cosmos."
Research Report:CRPropa 3.2 - an advanced framework for high-energy particle propagation in extragalactic and galactic spaces
Where do high-energy particles that endanger satellites, astronauts and airplanes come from New York NY (SPX) Sep 15, 2022 For decades, scientists have been trying to solve a vexing problem about the weather in outer space: At unpredictable times, high-energy particles bombard the earth and objects outside the earth's atmosphere with radiation that can endanger the lives of astronauts and destroy satellites' electronic equipment. These flare-ups can even trigger showers of radiation strong enough to reach passengers in airplanes flying over the North Pole. Despite scientists' best efforts, a clear pattern of how and when fl ... read more
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