Acceleration of He and Heavy Ions in Impulsive Solar Flares

脉冲太阳耀斑中 He 和重离子的加速

• 批准号: 9224688
• 负责人: Forrest Mozer
• 金额: $ 30万
• 依托单位: University of California-Berkeley
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-11-15 至 1997-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9224688&HistoricalAwards=false
• 关键词: Acceleration; He; Heavy; Ions; Impulsive

9224688 Mozer This project examines the theory of 3He and heavy ion acceleration in impulsive solar flares by modeling the effect of electromagnetic ion cyclotron waves on the acceleration of particles in the solar corona. In this theory, electromagnetic hydrogen cyclotron waves propagate into a larger magnetic field where they become resonant with particles have the next largest charge to mass ration after protons, namely 3He. The PI will predict the energy spectra and abundances of these ions in order to expose the theory to a rigorous test of its validity by future measurements. The PI will simulate the acceleration of ions by following test particles in phase space and we will model the waves by using a broadband wave spectrum composed of a superposition of random plane waves whose electric and magnetic fields are related by the appropriate dispersion relation. The project will model the distribution functions for comparison with those deduced from gamma-ray observations of energetic particles in closed magnetic flare loops. They will study the growth and damping of these waves for typical flare plasma parameters in the presence of an electron beam in order to determine the parameters of flare plasmas which are consistent with the waves. ***

[9224688]莫泽本项目通过模拟电磁离子回旋波对日冕粒子加速的影响，检验了脉冲太阳耀斑中的3He和重离子加速理论。在这个理论中，电磁氢回旋波传播到一个更大的磁场中，在那里它们与电荷质量比仅次于质子的粒子发生共振，即3He。PI将预测这些离子的能谱和丰度，以便在未来的测量中对该理论的有效性进行严格的测试。PI将通过跟踪相空间中的测试粒子来模拟离子的加速，我们将使用由随机平面波的叠加组成的宽带波谱来模拟波，这些平面波的电场和磁场通过适当的色散关系相关联。该项目将模拟分布函数，以便与封闭磁耀斑环中高能粒子的伽马射线观测推断的分布函数进行比较。他们将研究这些波在电子束存在下典型耀斑等离子体参数的增长和衰减，以确定与波一致的耀斑等离子体参数。＊＊＊