Time-dependent transport of energetic charged particles in the dynamical heliosphere

动态日光层中高能带电粒子的时间依赖性传输

• 批准号: 5307906
• 负责人: Professor Dr. Reinhard Schlickeiser
• 金额: --
• 依托单位: Institut für Theoretische Physik IV: Weltraum- und Astrophysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2001
• 资助国家: 德国
• 起止时间: 2000-12-31 至 2005-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/5307906?language=en
• 关键词: Time; dependent; transport; energetic; charged

After a decade of highly successful exploration of the three-dimensional structure of the inner heliosphere mainly during solar minimum activity, the Ulysses spacecraft is now heading towards high heliographic latitudes again. In difference to the previous minimum mission, Ulysses now starts to experience solar maximum conditions in its second out-of-ecliptic orbit around the Sun. This offers the unique opportunity to investigate the three-dimensional transport of cosmic rays and other energetic particles during a solar maximum activity period. Very little is known about the importance of the various transport processes during such periods, in particular about the solar activity dependence of diffusion and large-scale gradient and curvature drifts in the highly variable solar wind plasma. The observations of both galactic cosmic ray and Jovian electron intensities with the Kiel Electron Telescope (KET) onboard Ulysses are ideally suited to study the three-dimensional particle transport because of the spacecraft's unique trajectory and the longterm data recording by the KET instrument. It is expected that Ulysses will continue to record a complete solar activity cycle at least until 2002. These data combined with model calculations, using sophisticated multi-dimensional numerical transport models developed at the Universities of Potchefstroom and Bochum, will allow us to determine the significance of the various modulation processes and constrain the relevant transport parameters (e.g. the diffusion coefficients). The intended collaboration between the German and South African groups will enable us to improve the current understanding of solar modulation of galactic cosmic rays as well as the propagation of Jovian electrons. Based on the experimental and modelling expertise on either side we anticipate a successful and productive joint research collaboration.

在主要在太阳活动极小期对日光层内层的三维结构进行了十年非常成功的探索之后，欧空局航天器现在再次向高日光纬度地区飞行。与以前的最小使命不同，现在，在围绕太阳的第二个黄道外轨道上，太阳黑子开始经历太阳极大期的条件。这为研究太阳活动高峰期宇宙射线和其他高能粒子的三维传输提供了独特的机会。人们对这一时期各种传输过程的重要性知之甚少，特别是对高度可变的太阳风等离子体中扩散和大尺度梯度和曲率漂移对太阳活动的依赖性知之甚少。由于航天器独特的轨道和KET仪器的长期数据记录，利用航天器上的基尔电子望远镜（KET）观测银河宇宙线和木星电子强度非常适合研究三维粒子输运。预计至少在2002年之前，伽利略号将继续记录一个完整的太阳活动周期。利用波切夫斯特鲁姆大学和波鸿大学开发的复杂多维数值传输模型，将这些数据与模型计算相结合，将使我们能够确定各种调制过程的重要性，并限制相关的传输参数（例如扩散系数）。德国和南非小组之间的预期合作将使我们能够提高目前对太阳调制银河宇宙射线以及木星电子传播的理解。基于双方的实验和建模专业知识，我们期待着成功和富有成效的联合研究合作。