Cosmic ray propagation in a fractal galactic medium
Simple cosmic ray diffusion in magnetic fields is often discussed in terms of a characteristic scattering mean free path or equivalent diffusion coefficient. This assumes very simple properties of the structure of astrophysical magnetic fields. A better approximation is to assume that the magnetic s...
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| Format: | Article |
| Language: | English |
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Academy of Science of South Africa
2011-01-01
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| Series: | South African Journal of Science |
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| Online Access: | https://sajs.co.za/article/view/10080 |
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| author | Hamid Kermani Jalileldin Fatemi |
| author_facet | Hamid Kermani Jalileldin Fatemi |
| author_sort | Hamid Kermani |
| collection | DOAJ |
| description | Simple cosmic ray diffusion in magnetic fields is often discussed in terms of a characteristic scattering mean free path or equivalent diffusion coefficient. This assumes very simple properties of the structure of astrophysical magnetic fields. A better approximation is to assume that the magnetic structure has fractal properties and there is then the possibility of including very short and very long interaction lengths when modelling the propagation. Results of modelling such propagation in a fractal medium are discussed. Values of the propagation parameter (α) less than 2 were obtained and confirm the plausibility of the hypothesis that supernova are the origin of galactic cosmic rays in the energy range below the knee in the spectrum. |
| format | Article |
| id | doaj-art-e269357bb8cd44f8b5f37d22c590bced |
| institution | DOAJ |
| issn | 1996-7489 |
| language | English |
| publishDate | 2011-01-01 |
| publisher | Academy of Science of South Africa |
| record_format | Article |
| series | South African Journal of Science |
| spelling | doaj-art-e269357bb8cd44f8b5f37d22c590bced2025-08-20T03:13:06ZengAcademy of Science of South AfricaSouth African Journal of Science1996-74892011-01-011071/24 pages4 pages8282Cosmic ray propagation in a fractal galactic mediumHamid Kermani0Jalileldin Fatemi1Department of Physics, Faculty of Science, University of Kerman, Islamic Republic of IranDepartment of Physics, Faculty of Science, University of Kerman, Islamic Republic of IranSimple cosmic ray diffusion in magnetic fields is often discussed in terms of a characteristic scattering mean free path or equivalent diffusion coefficient. This assumes very simple properties of the structure of astrophysical magnetic fields. A better approximation is to assume that the magnetic structure has fractal properties and there is then the possibility of including very short and very long interaction lengths when modelling the propagation. Results of modelling such propagation in a fractal medium are discussed. Values of the propagation parameter (α) less than 2 were obtained and confirm the plausibility of the hypothesis that supernova are the origin of galactic cosmic rays in the energy range below the knee in the spectrum.https://sajs.co.za/article/view/10080cosmic raydiffusionfractalmagnetic field |
| spellingShingle | Hamid Kermani Jalileldin Fatemi Cosmic ray propagation in a fractal galactic medium South African Journal of Science cosmic ray diffusion fractal magnetic field |
| title | Cosmic ray propagation in a fractal galactic medium |
| title_full | Cosmic ray propagation in a fractal galactic medium |
| title_fullStr | Cosmic ray propagation in a fractal galactic medium |
| title_full_unstemmed | Cosmic ray propagation in a fractal galactic medium |
| title_short | Cosmic ray propagation in a fractal galactic medium |
| title_sort | cosmic ray propagation in a fractal galactic medium |
| topic | cosmic ray diffusion fractal magnetic field |
| url | https://sajs.co.za/article/view/10080 |
| work_keys_str_mv | AT hamidkermani cosmicraypropagationinafractalgalacticmedium AT jalileldinfatemi cosmicraypropagationinafractalgalacticmedium |