Studies of paleomagnetospheric processes: Structure and dynamics of the geomagnetic environment in space during polarity transitions

古磁层过程研究：极性转变期间空间地磁环境的结构和动力学

• 批准号: 5250866
• 负责人: Professor Dr. Joachim Vogt
• 金额: --
• 依托单位: Institut für Geophysik und Extraterrestrische Physik
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2000
• 资助国家: 德国
• 起止时间: 1999-12-31 至 2005-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5250866?language=en
• 关键词: Studies; paleomagnetospheric; processes; Structure; dynamics

Earth`s magnetosphere is mainly controlled by the interaction of the supersonic solar wind with the dipolar component of the internal geomagnetic field. Polarity transitions thus have a large effect on its structure and its dynamics. Preliminary studies showed that the locations of boundary layers and current systems change significantly and that external variations become stronger and more frequent. We aim at a detailed investigation of the influence of decreasing dipole strength and increasing higher order multipole moments on magnetospheric structure and dynamics. Theoretical concepts of present day`s magnetosphere will be applied and generalised to the paleo situation. Three-dimensional MHD simulations will be analysed to yield parametric magnetic field models. Such models are required as input to treat high-energy particle kinetics in the geomagnetic environment. The resulting particle fluxes provide a basis for models of nuclid production in Earth`s atmosphere as well as models of ozon depletion.

地球磁层主要受超音速太阳风与内部地磁场偶极分量的相互作用控制。因此，极性转换对其结构和动力学有很大的影响。初步研究表明，边界层和海流系统的位置变化很大，外部变化变得更强和更频繁。我们的目标是详细调查的影响，减少偶极子强度和增加高阶多极矩的磁层结构和动力学。今天的磁层的理论概念将被应用和推广到古情况。将分析三维MHD模拟以产生参数磁场模型。这种模型需要作为输入来处理地磁环境中的高能粒子动力学。由此产生的粒子通量提供了一个基础模型的nuclid生产在地球大气中，以及臭氧消耗模型。