Ions in near-Earth space

近地空间的离子

• 批准号: 403206056
• 负责人: Privatdozentin Dr. Elena Kronberg
• 金额: --
• 依托单位: Sektion Geophysik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/403206056?language=en
• 关键词: Ions; near; Earth; space

The goal of this proposal is to characterise the plasma distribution in the near-Earth magnetosphere using satellite measurements. The terrestrial plasma environment continuously receives particles from thesolar wind and the ionosphere. These particles define the dynamics of the Earth's space environment. The observation and prediction of the particle population is essential for magnetospheric modeling, vitally important for operating modern communication systems and planing of future space missions. There are many viable magnetospheric models. However, their predictions still suffer from ambiguous particle distribution inputs. This proposal aims to remedy this situation by providing particle distribution functions that scale with location in the near-Earth space, solar wind parameters, the strength of magnetic turbulence and depend on particle species. To achieve this, we will calculate the distribution functions from particle data measured by the European spacecraft ``Cluster'', which excels by simultaneous coverage of one and a half solar cycle, a wide particle energy range and the detection of the ion composition. Until now, the sparsity of observations prohibited such a study. Having obtained the particle distribution functions as boundary conditions, we will then use them as an input in advanced magnetospheric models. We will do a test for a specific magnetic storm event to identify an improvement in the prediction of magnetospheric dynamics, by using our novel approach to quantify particle populations. This extensive study involves a PhD student who will become a new specialist for Earth's plasma environment.

这项提议的目标是利用卫星测量来描述近地磁层中的等离子体分布。地球等离子体环境不断地接收来自太阳风和电离层的粒子。这些粒子决定了地球空间环境的动力学。粒子群的观测和预测对磁层建模至关重要，对操作现代通信系统和规划未来空间任务至关重要。有许多可行的磁层模型。然而，他们的预测仍然受到模糊粒子分布输入的影响。该提案旨在通过提供与近地空间位置、太阳风参数、磁湍流强度和粒子种类相关的粒子分布函数来纠正这种情况。为了实现这一目标，我们将根据欧洲航天器“Cluster”测量的粒子数据计算分布函数，该数据的优点是同时覆盖一个半太阳周期、宽粒子能量范围和检测离子成分。到目前为止，由于观测的稀缺性，禁止进行这样的研究。在得到粒子分布函数作为边界条件后，我们将把它们作为高级磁层模型的输入。我们将对一个特定的磁暴事件进行测试，通过使用我们的新方法来量化粒子群，以确定磁层动力学预测的改进。这项广泛的研究涉及一名博士生，他将成为地球等离子体环境的新专家。