...
  • 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 >Hot and cold ion outflow: Observations and implications for numerical models
【24h】

Hot and cold ion outflow: Observations and implications for numerical models

机译：冷热离子外流:观察和对数值模型

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

Cluster observations of oxygen ion outflow and low-frequency waves at high altitude above the polar cap and cold ion outflow in the lobes are used to determine ion heating rates and low-altitude boundary conditions suitable for use in numerical models of ion outflow. Using our results, it is possible to simultaneously reproduce observations of high-energy O~+ ions in the high-altitude cusp and mantle and cold H~+ ions in the magnetotail lobes. To put the Cluster data in a broader context, we first compare the average observed oxygen temperatures and parallel velocities in the high-altitude polar cap with the idealized cases of auroral (cusp) and polar wind (polar cap) ion outflow obtained from a model based on other data sets. A cyclotron resonance model using average observed electric field spectral densities as input fairly well reproduces the observed velocities and perpendicular temperatures of both hot O~+ and cold H~+, if we allow the fraction of the observed waves, which is efficient in heating the ions to increase with altitude and decrease toward the nightside. Suitable values for this fraction are discussed based on the results of the cyclotron resonance model. Low-altitude boundary conditions, ion heating rates, and centrifugal acceleration are presented in a format suitable as input for models aiming to reproduce the observations.
机译：集群的观察氧离子外流和低频波在高空之上极地冰冠和冷离子外流的叶用于确定离子加热率和低空边界条件适合使用在离子外流的数值模型。结果,同时是可能的繁殖的观察高能O ~ +离子高空尖端和地幔和冷H ~ +离子磁尾叶。数据在更广泛的背景下,我们首先比较平均观察温度和氧气平行速度在高空极地冰冠极光的理想化的情况下(尖头)和极性的风(极冠)离子外流获得模型基于其他数据集。使用平均共振模型观察电场谱密度作为输入相当好繁殖速度和O ~ +和垂直温度的热冷H ~ +,如果我们允许的分数观察到的波,在加热效率离子增加高度和减少阴面。结果的基础上讨论分数回旋共振模型。边界条件、离子加热率和提出了离心加速度合适的目标作为模型的输入格式复制的观察。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
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