...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Proton and hydrogen atom transport in the Martian upper atmosphere with an induced magnetic field
【24h】

Proton and hydrogen atom transport in the Martian upper atmosphere with an induced magnetic field

机译：质子和氢原子在火星运输高层大气感应磁场

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We have applied the Direct Simulation Monte Carlo method to solve the kinetic equation for the H/H~+ transport in the upper Martian atmosphere. We calculate the upward H and H~+ fluxes, values that can be measured, and the altitude profile of the energydeposition to be used to understand the energy balance in the Martian atmosphere. The calculations of the upward flux have been made for the Martian atmosphere during solar minimum. We use an energy spectrum of the down moving protons in the altitude range 355–437 km adopted from the Mars Express Analyzer of Space Plasma and Energetic Atoms measurements in the range 700 eV–20 keV. The particle and energy fluxes of the downward moving protons were equal to 3.0 × 106 cm~(-2) s~(-1) and 1.4 × 10~(-2) erg cm~(-2) s~)(-1).It was found that 22% of particle flux and 12% of the energy flux of the precipitatingprotons is backscattered by the Martian upper atmosphere, if no induced magnetic field is taken into account in the simulations. If we include a 20 nT horizontal magnetic field, a typical field measured by Mars Global Surveyor in the altitude range of 85–500 km, we find that up to 40%–50% of the energy flux of the precipitating protons is backscattered depending on the velocity distribution of the precipitating protons. We thus conclude that the induced magnetic field plays a crucial role in the transport of charged particles in the upper atmosphere of Mars and, therefore, that it determines the energy deposition of the solar wind.
机译：我们应用蒙特卡罗直接模拟方法来解决的动力学方程H / H ~ +运输上火星大气。我们向上的H, H ~ +通量,计算值可以测量,高度的energydeposition被用来理解火星大气的能量平衡。计算向上的通量在太阳的火星大气。我们使用一个能量谱的移动质子的海拔范围355 - 437公里火星快车分析仪的空间等离子体和充满活力的原子测量在700年eV-20凯文。向下移动质子等于3.0×106厘米~(2)~(1)和1.4×10 ~ (2)erg厘米~ (2)~)(1)。和能量通量的12%precipitatingprotons背散射的火星高层大气,如果没有诱导磁场模拟中考虑。如果我们包括20元水平磁场,一个典型的火星环球探测者号字段来衡量在85 - 500公里的高度范围,我们发现高达40%的能量通量的-50%沉淀质子是背散射不同沉淀的速度分布质子。磁场中起着至关重要的作用运输上的带电粒子火星大气层,因此它决定了太阳能的能量沉积风。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号