Heavy ion acceleration at parallel shocks
A study of alpha particle acceleration at parallel shock due to an interaction with Alfvén waves self-consistently excited in both upstream and downstream regions was conducted using a scale-separation model (Galinsky and Shevchenko, 2000, 2007). The model uses conservation laws and resonance condit...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2010-11-01
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| Series: | Nonlinear Processes in Geophysics |
| Online Access: | http://www.nonlin-processes-geophys.net/17/663/2010/npg-17-663-2010.pdf |
| _version_ | 1811261024980959232 |
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| author | V. L. Galinsky V. I. Shevchenko |
| author_facet | V. L. Galinsky V. I. Shevchenko |
| author_sort | V. L. Galinsky |
| collection | DOAJ |
| description | A study of alpha particle acceleration at parallel shock due to an interaction with Alfvén waves self-consistently excited in both upstream and downstream regions was conducted using a scale-separation model (Galinsky and Shevchenko, 2000, 2007). The model uses conservation laws and resonance conditions to find where waves will be generated or damped and hence where particles will be pitch-angle scattered. It considers the total distribution function (for the bulk plasma and high energy tail), so no standard assumptions (e.g. seed populations, or some ad-hoc escape rate of accelerated particles) are required. The heavy ion scattering on hydromagnetic turbulence generated by both protons and ions themselves is considered. The contribution of alpha particles to turbulence generation is important because of their relatively large mass-loading parameter <i>P</i><sub>&alpha;</sub>=<i>n</i><sub>&alpha;</sub><i>m</i><sub>&alpha;</sub>/<i>n</i><sub>p</sub><i>m</i><sub>p</sub> (<i>m</i><sub>p</sub>, <i>n</i><sub>p</sub> and <i>m</i><sub>&alpha;</sub>, <i>n</i><sub>&alpha;</sub> are proton and alpha particle mass and density) that defines efficiency of wave excitation. The energy spectra of alpha particles are found and compared with those obtained in test particle approximation. |
| first_indexed | 2024-04-12T18:56:21Z |
| format | Article |
| id | doaj.art-10b73d0421fd4edfaa27a46132d770b5 |
| institution | Directory Open Access Journal |
| issn | 1023-5809 1607-7946 |
| language | English |
| last_indexed | 2024-04-12T18:56:21Z |
| publishDate | 2010-11-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Nonlinear Processes in Geophysics |
| spelling | doaj.art-10b73d0421fd4edfaa27a46132d770b52022-12-22T03:20:18ZengCopernicus PublicationsNonlinear Processes in Geophysics1023-58091607-79462010-11-0117666367110.5194/npg-17-663-2010Heavy ion acceleration at parallel shocksV. L. GalinskyV. I. ShevchenkoA study of alpha particle acceleration at parallel shock due to an interaction with Alfvén waves self-consistently excited in both upstream and downstream regions was conducted using a scale-separation model (Galinsky and Shevchenko, 2000, 2007). The model uses conservation laws and resonance conditions to find where waves will be generated or damped and hence where particles will be pitch-angle scattered. It considers the total distribution function (for the bulk plasma and high energy tail), so no standard assumptions (e.g. seed populations, or some ad-hoc escape rate of accelerated particles) are required. The heavy ion scattering on hydromagnetic turbulence generated by both protons and ions themselves is considered. The contribution of alpha particles to turbulence generation is important because of their relatively large mass-loading parameter <i>P</i><sub>&alpha;</sub>=<i>n</i><sub>&alpha;</sub><i>m</i><sub>&alpha;</sub>/<i>n</i><sub>p</sub><i>m</i><sub>p</sub> (<i>m</i><sub>p</sub>, <i>n</i><sub>p</sub> and <i>m</i><sub>&alpha;</sub>, <i>n</i><sub>&alpha;</sub> are proton and alpha particle mass and density) that defines efficiency of wave excitation. The energy spectra of alpha particles are found and compared with those obtained in test particle approximation.http://www.nonlin-processes-geophys.net/17/663/2010/npg-17-663-2010.pdf |
| spellingShingle | V. L. Galinsky V. I. Shevchenko Heavy ion acceleration at parallel shocks Nonlinear Processes in Geophysics |
| title | Heavy ion acceleration at parallel shocks |
| title_full | Heavy ion acceleration at parallel shocks |
| title_fullStr | Heavy ion acceleration at parallel shocks |
| title_full_unstemmed | Heavy ion acceleration at parallel shocks |
| title_short | Heavy ion acceleration at parallel shocks |
| title_sort | heavy ion acceleration at parallel shocks |
| url | http://www.nonlin-processes-geophys.net/17/663/2010/npg-17-663-2010.pdf |
| work_keys_str_mv | AT vlgalinsky heavyionaccelerationatparallelshocks AT vishevchenko heavyionaccelerationatparallelshocks |