Particle Acceleration in Solar Flares

太阳耀斑中的粒子加速

• 批准号: 9214678
• 负责人: Dean Smith
• 金额: $ 17.79万
• 依托单位: Berkeley Research Associates Inc
• 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: 1993-03-01 至 1997-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9214678&HistoricalAwards=false
• 关键词: Particle; Acceleration; Solar; Flares

This project will study particle acceleration in solar flares. A key problem in solar flare physics is the manner in which protons and other particles are accelerated to several tens of MeV in a few seconds as evidenced by impulsive >-ray emission. This process is called first-phase ion acceleration. The most widely accepted models in explaining this acceleration are shock acceleration and stochastic acceleration by Alfven or magnetosonic waves. Neither of these models has been developed self-consistently or has direct observational verification. This project examines the consistent development of a single-loop manetohydrodynamic (MHD) wave stochastic acceleration model. A half-loop is divided into 2 coronal sections attached to a model chromosphere and photosphere. The coronal sections include the source where time-dependent acceleration including wave-particle and wave-wave interactions occurs, and a transport section in which protons propagate diffusively. Unlike previous work, it will be a complete model for nonrelativistic energies including a nuclear interaction calculation. Thus, it will be possible to study the effect of changing the spectrum and/or power of turbulence in the source, the loop size, etc., throughout the whole loop. In short, we shall be able to put the stochastic acceleration model to a very thorough test. Observational consequences in prompt >-ray emission come from the nuclear interaction part of the calculation. These results will increase our understanding in this important area of solar research. #

该项目将研究太阳耀斑的颗粒加速度。 太阳耀斑物理学中的一个关键问题是质子和其他颗粒在几秒钟内将质子和其他颗粒加速到几十MEV的方式，这是通过冲动> - 射线发射证明的。该过程称为第一阶段离子加速度。解释这种加速度的最广泛的模型是Alfven或磁波波的休克加速度和随机加速。这些模型均未是自以为是的，也没有直接进行观察验证。该项目研究了单环元水力动力学（MHD）波随机加速模型的一致发展。半循环分为2个附着在模型色球和光球的冠状切片。 冠状切片包括时间依赖性加速度在内的来源，包括波粒和波浪相互作用，以及质子扩散地传播的传输部分。与以前的工作不同，它将是非依赖能量（包括核交互计算）的完整模型。因此，在整个环中，可以研究改变源，循环大小等湍流的光谱和/或功率的效果。简而言之，我们将能够将随机加速模型放在非常彻底的测试中。及时> - 射线发射中的观察后果来自计算的核相互作用部分。这些结果将增加我们在太阳能研究的这一重要领域的理解。 ＃