Speaker
Description
The energy region around the "knee" of the cosmic-ray spectrum marks a transition where changes in the observed spectral shape and composition indicate a shift in the underlying physical processes of the sources of Galactic cosmic rays. In this work, cosmic-ray transport around this energy is simulated with CRPropa, using the JF12 Galactic magnetic field model with both large-scale and turbulent components. A population of Galactic single-particle sources is placed in the Galactic plane, and particle trajectories are followed through the full three-dimensional magnetic field environment.
To better understand the influence of the magnetic field and location of the source, a source-dependent transmission efficiency is defined, based on the fraction of particles that reach an observer located roughly around the location of the Earth compared to those that leave the Galaxy. The results suggest that how visible a source is from Earth depends not only on where the source is located, but also on how particles propagate through the Galactic magnetic field.
In the next stage of this work, more realistic source scenarios will be studied, including specific source types with physical energy spectra and mixed nuclear compositions. Using CRPropa with the JF12 field, the cosmic-ray energy and composition distributions expected at Earth will be simulated for different source models. This will allow us to explore how different types of sources may produce different composition signatures at Earth, helping to connect observations with possible source populations and Galactic propagation effects.
| Talk category | NOVA Network 3 |
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