Role of geomagnetic field in atmospheric escape from Earth

地磁场在大气逃逸地球中的作用

• 批准号: 169031908
• 负责人: Professor Dr. Hermann Lühr
• 金额: --
• 依托单位: Sektion 2.2: Geophysikalische Abbildung des Untergrunds
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2010
• 资助国家: 德国
• 起止时间: 2009-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/169031908?language=en
• 关键词: Role; geomagnetic; field; atmospheric; escape

The geomagnetic field prevents the Earth from having its atmosphere swept away by the solar wind. But due to the partial ionization of the upper atmosphere by the sun’s short-wavelength radiation electrodynamic forces can move the charged particles upward, against gravity, along open field lines. Already in the early space age it was recognized that considerable amounts of ionospheric ions populate the magnetosphere. In this study we will investigate the acceleration mechanisms of the up-welling ions at source regions altitude. For the first time the role of the neutral particles in the thermosphere are also included in the considerations. For our studies we will make use of data from the satellites CHAMP (400km), GRACE (500km) and DMSP (830km). The space observations shall be augmented by suitable EISCAT radar measurements. As a result the total rates of the different out-flow regions, polar cap, cusp, and auroral region will be quantified and their dependence on geophysical conditions determined.

地磁场防止地球大气层被太阳风吹走。但是，由于太阳短波辐射使上层大气部分电离，电动力可以使带电粒子克服重力，沿着开放场线向上移动。早在空间时代早期，人们就认识到，磁层中存在着大量的电离层离子。在本研究中，我们将探讨在源区高度上涌离子的加速机制。第一次，中性粒子在热层中的作用也包括在考虑之中。在我们的研究中，我们将利用CHAMP（400公里）、GRACE（500公里）和DMSP（830公里）卫星的数据。空间观测应通过适当的EISCAT雷达测量进行增强。因此，不同的流出区域，极冠，尖点和极光区的总速率将被量化，并确定它们对地球物理条件的依赖性。