Scattering of Superthermal Ions at Shocks: Dependence on Energy
Diffusive shock acceleration requires the production of backstreaming superthermal ions (injection) as a first step. Such ions can be generated in the process of scattering of ions in the superthermal tail off the shock front. Knowledge of the scattering of high-energy ions is essential for matching...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad04dd |
| _version_ | 1797635772261597184 |
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| author | Michael Gedalin Natalia Ganushkina Nikolai V. Pogorelov Vadim Roytershteyn |
| author_facet | Michael Gedalin Natalia Ganushkina Nikolai V. Pogorelov Vadim Roytershteyn |
| author_sort | Michael Gedalin |
| collection | DOAJ |
| description | Diffusive shock acceleration requires the production of backstreaming superthermal ions (injection) as a first step. Such ions can be generated in the process of scattering of ions in the superthermal tail off the shock front. Knowledge of the scattering of high-energy ions is essential for matching conditions of upstream and downstream distributions at the shock transition. Here we analyze the generation of backstreaming ions as a function of their initial energy in a model stationary shock and in a similar rippled shock. Rippling substantially enhances ion reflection and the generation of backstreaming ions for slightly and moderately superthermal energies, and thus is capable of ensuring ion injection into a further diffusive shock acceleration process. For high-energy ions, there is almost no difference in the fraction of backstreaming ions produced and the ion distributions between the planar stationary shock and the rippled shock. |
| first_indexed | 2024-03-11T12:25:05Z |
| format | Article |
| id | doaj.art-cac267d6add344f183a9a8fca873ebed |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-11T12:25:05Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-cac267d6add344f183a9a8fca873ebed2023-11-06T10:55:29ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-01957210610.3847/1538-4357/ad04ddScattering of Superthermal Ions at Shocks: Dependence on EnergyMichael Gedalin0https://orcid.org/0000-0003-1236-4787Natalia Ganushkina1https://orcid.org/0000-0002-9259-850XNikolai V. Pogorelov2https://orcid.org/0000-0002-6409-2392Vadim Roytershteyn3https://orcid.org/0000-0003-1745-7587Department of Physics, Ben Gurion University of the Negev , Beer-Sheva, Israel ; gedalin@bgu.ac.ilFinnish Meteorological Institute , Helsinki, Finland; Climate and Space Science and Engineering Department, University of Michigan , Ann Arbor, MI, USADepartment of Space Science, The University of Alabama in Huntsville , AL 35805, USA; Center for Space Plasma and Aeronomic Research, The University of Alabama in Huntsville , AL 35805, USASpace Science Institute , Boulder, CO 80301, USADiffusive shock acceleration requires the production of backstreaming superthermal ions (injection) as a first step. Such ions can be generated in the process of scattering of ions in the superthermal tail off the shock front. Knowledge of the scattering of high-energy ions is essential for matching conditions of upstream and downstream distributions at the shock transition. Here we analyze the generation of backstreaming ions as a function of their initial energy in a model stationary shock and in a similar rippled shock. Rippling substantially enhances ion reflection and the generation of backstreaming ions for slightly and moderately superthermal energies, and thus is capable of ensuring ion injection into a further diffusive shock acceleration process. For high-energy ions, there is almost no difference in the fraction of backstreaming ions produced and the ion distributions between the planar stationary shock and the rippled shock.https://doi.org/10.3847/1538-4357/ad04ddShocksPlanetary bow shocksInterplanetary shocks |
| spellingShingle | Michael Gedalin Natalia Ganushkina Nikolai V. Pogorelov Vadim Roytershteyn Scattering of Superthermal Ions at Shocks: Dependence on Energy The Astrophysical Journal Shocks Planetary bow shocks Interplanetary shocks |
| title | Scattering of Superthermal Ions at Shocks: Dependence on Energy |
| title_full | Scattering of Superthermal Ions at Shocks: Dependence on Energy |
| title_fullStr | Scattering of Superthermal Ions at Shocks: Dependence on Energy |
| title_full_unstemmed | Scattering of Superthermal Ions at Shocks: Dependence on Energy |
| title_short | Scattering of Superthermal Ions at Shocks: Dependence on Energy |
| title_sort | scattering of superthermal ions at shocks dependence on energy |
| topic | Shocks Planetary bow shocks Interplanetary shocks |
| url | https://doi.org/10.3847/1538-4357/ad04dd |
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