Transport of suprathermal and energetic ions in the heliosphere and their injection and acceleration at shocks driven by coronal mass ejections

日光层中超热和高能离子的传输及其在日冕物质抛射驱动的冲击下的注入和加速

• 批准号: 21152232
• 负责人: Dr. Karin Bamert
• 金额: --
• 依托单位: Physikalisches Institut
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2006
• 资助国家: 德国
• 起止时间: 2005-12-31 至 2009-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/21152232?language=en
• 关键词: Transport; suprathermal; energetic; ions; heliosphere

Energetic particles in the heliosphere are affected by many transport and acceleration processes. The intensity of Galactic cosmic rays and other energetic particles is modulated by the large-scale structure of the heliosphere. On the other hand, microscopic processes in corotating interaction regions, at coronal mass ejections (CMEs), and in other solar events and in the solar wind in general influence the flux and the spectra of energetic particles. Spatial and energy diffusion are determined by Alfénic, magnetosonic or ion-acoustic turbulence. We will focus on three types of energetic particles associated with coronal mass ejections: 1) solar wind ions accelerated at CME-driven shocks, 2) ions previously accelerated in impulsive flares, e.g., 3He and 3) interstellar or inner-source pick-up ions. For a better understanding of the transport and acceleration of ions in the inner heliosphere, where CME-driven shocks are thought to be quite strong, we will analyze the behavior of the three populations in the vicinity of currently accessible CME-driven shocks near Earth¿s orbit. We plan to cover the suprathermal and energetic ion energy range to investigate the influence of different shock configurations on the injection and acceleration of particles of different origin. In particular, we will investigate the different mechanisms of turbulence generation and the different types of wave-particle interactions near CME-driven shocks.

日球层中的高能粒子受到许多输运和加速过程的影响。银河宇宙射线和其他高能粒子的强度受到日光层大尺度结构的调制。另一方面，在共转相互作用区域、日冕物质抛射（CME）、其他太阳事件和太阳风中的微观过程通常会影响高能粒子的通量和光谱。空间和能量扩散由Alfénic、磁声或离子声湍流决定。我们将重点讨论与日冕物质抛射相关的三种高能粒子：1）在日冕物质抛射驱动的冲击中加速的太阳风离子，2）先前在脉冲耀斑中加速的离子，例如，3He和3）星际或内源拾取离子。为了更好地了解内日光层中离子的传输和加速，CME驱动的冲击被认为是相当强的，我们将分析三个种群在地球轨道附近当前可访问的CME驱动冲击附近的行为。我们计划覆盖超热和高能离子能量范围，以研究不同的冲击配置对不同起源的粒子的注入和加速的影响。特别地，我们将研究湍流产生的不同机制和CME驱动冲击附近的不同类型的波粒相互作用。