Mach number and plasma beta dependence of the ion temperature perpendicular to the external magnetic field in the transition region of perpendicular collisionless shocks
Ion temperature anisotropy is a common feature for (quasi-)perpendicular collisionless shocks. By using two-dimensional full particle simulations, it is shown that the ion temperature component perpendicular to the shock magnetic field at the shock foot region is proportional to the square of the Al...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2019-12-01
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| Series: | AIP Advances |
| Online Access: | http://dx.doi.org/10.1063/1.5129067 |
| _version_ | 1818845875907067904 |
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| author | Ryo Yamazaki Ayato Shinoda Takayuki Umeda Shuichi Matsukiyo |
| author_facet | Ryo Yamazaki Ayato Shinoda Takayuki Umeda Shuichi Matsukiyo |
| author_sort | Ryo Yamazaki |
| collection | DOAJ |
| description | Ion temperature anisotropy is a common feature for (quasi-)perpendicular collisionless shocks. By using two-dimensional full particle simulations, it is shown that the ion temperature component perpendicular to the shock magnetic field at the shock foot region is proportional to the square of the Alfvén Mach number divided by the plasma beta. This result is also explained by a simple analytical argument in which the reflected ions get energy from an upstream plasma flow. By comparing our analytic and numerical results, it is also confirmed that the fraction of the reflected ions hardly depends on the plasma beta and the Alfvén Mach number when the square of the Alfvén Mach number divided by the plasma beta is larger than about 20. |
| first_indexed | 2024-12-19T05:36:37Z |
| format | Article |
| id | doaj.art-dc457df189424fce94de0f9f8008cd02 |
| institution | Directory Open Access Journal |
| issn | 2158-3226 |
| language | English |
| last_indexed | 2024-12-19T05:36:37Z |
| publishDate | 2019-12-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | AIP Advances |
| spelling | doaj.art-dc457df189424fce94de0f9f8008cd022022-12-21T20:34:08ZengAIP Publishing LLCAIP Advances2158-32262019-12-01912125010125010-410.1063/1.5129067Mach number and plasma beta dependence of the ion temperature perpendicular to the external magnetic field in the transition region of perpendicular collisionless shocksRyo Yamazaki0Ayato Shinoda1Takayuki Umeda2Shuichi Matsukiyo3Department of Physics and Mathematics, Aoyama Gakuin University, Sagamihara 252-5258, JapanDepartment of Physics and Mathematics, Aoyama Gakuin University, Sagamihara 252-5258, JapanInstitute for Space-Earth Environmental Research, Nagoya University, Nagoya 464-8601, JapanDepartment of Earth System Science and Technology, Kyushu University, Kasuga 816-8580, JapanIon temperature anisotropy is a common feature for (quasi-)perpendicular collisionless shocks. By using two-dimensional full particle simulations, it is shown that the ion temperature component perpendicular to the shock magnetic field at the shock foot region is proportional to the square of the Alfvén Mach number divided by the plasma beta. This result is also explained by a simple analytical argument in which the reflected ions get energy from an upstream plasma flow. By comparing our analytic and numerical results, it is also confirmed that the fraction of the reflected ions hardly depends on the plasma beta and the Alfvén Mach number when the square of the Alfvén Mach number divided by the plasma beta is larger than about 20.http://dx.doi.org/10.1063/1.5129067 |
| spellingShingle | Ryo Yamazaki Ayato Shinoda Takayuki Umeda Shuichi Matsukiyo Mach number and plasma beta dependence of the ion temperature perpendicular to the external magnetic field in the transition region of perpendicular collisionless shocks AIP Advances |
| title | Mach number and plasma beta dependence of the ion temperature perpendicular to the external magnetic field in the transition region of perpendicular collisionless shocks |
| title_full | Mach number and plasma beta dependence of the ion temperature perpendicular to the external magnetic field in the transition region of perpendicular collisionless shocks |
| title_fullStr | Mach number and plasma beta dependence of the ion temperature perpendicular to the external magnetic field in the transition region of perpendicular collisionless shocks |
| title_full_unstemmed | Mach number and plasma beta dependence of the ion temperature perpendicular to the external magnetic field in the transition region of perpendicular collisionless shocks |
| title_short | Mach number and plasma beta dependence of the ion temperature perpendicular to the external magnetic field in the transition region of perpendicular collisionless shocks |
| title_sort | mach number and plasma beta dependence of the ion temperature perpendicular to the external magnetic field in the transition region of perpendicular collisionless shocks |
| url | http://dx.doi.org/10.1063/1.5129067 |
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