### 抜粋

The shock front nonstationarity of perpendicular shocks in super-critical regime is analyzed by examining the coupling between "incoming" and "reflected" ion populations. For a given set of parameters including the upstream Mach number (M_{A}) and the fraction a of reflected to incoming ions, a self-consistent, time-stationary solution of the coupling between ion streams and the electromagnetic field is sought for. If such a solution is found, the shock is stationary; otherwise, the shock is nonstationary, leading to a self-reforming shock front often observed in full particle simulations of quasiperpendicular shocks. A parametric study of this numerical model allows us to define a critical α_{crit}, between stationary and nonstationary regimes. The shock can be nonstationary even for relatively low M_{A}(2-5). For a moderate M_{A}(5-10), the critical value α_{crit} is about 15 to 20%. For very high M _{A} (>10), α_{crit} saturates around 20%. Moreover, present full simulations show that self-reformation of the shock front occurs for relatively low β_{i} and disappears for high β_{i} where β_{i} is the ratio of upstream ion plasma to magnetic field pressures. Results issued from the present theoretical model are found to be in good agreement with full particle simulations for low β_{i} case; this agreement holds as long as the motion of reflected ions is coherent enough (narrow ion ring) to be described by a single population in the model. The present model reveals to be "at variance" with full particle simulations results for the high β_{i} case. Present results are also compared with previous hybrid simulations.

元の言語 | 英語 |
---|---|

記事番号 | 1233 |

ジャーナル | Journal of Geophysical Research: Space Physics |

巻 | 108 |

発行部数 | A6 |

DOI | |

出版物ステータス | 出版済み - 6 2003 |

### All Science Journal Classification (ASJC) codes

- Geophysics
- Forestry
- Oceanography
- Aquatic Science
- Ecology
- Water Science and Technology
- Soil Science
- Geochemistry and Petrology
- Earth-Surface Processes
- Atmospheric Science
- Earth and Planetary Sciences (miscellaneous)
- Space and Planetary Science
- Palaeontology

## フィンガープリント Shock front nonstationarity of supercritical perpendicular shocks' の研究トピックを掘り下げます。これらはともに一意のフィンガープリントを構成します。

## これを引用

*Journal of Geophysical Research: Space Physics*,

*108*(A6), [1233]. https://doi.org/10.1029/2002JA009339