Particle Acceleration in Magnetic Reconnection Regions in the Solar Corona

研究人员将研究与日冕磁场重联相关的电场对电子和质子的加速作用。在宇宙等离子体中，特别是在太阳耀斑中，带电粒子加速到远远超过热能的能量是普遍存在的。目的是通过重联过程自洽地模拟日冕磁能向快速粒子动能的快速转换。重新连接的电流片的参数将根据守恒定律使用平衡方程系统自一致地确定。将考虑湍流和完全无碰撞重联两种情况。耀斑日冕等离子体和耀斑环的特性将被计算并用作测试重联模型的一种手段。将计算日冕中各种条件下加速粒子的能量、加速时间、电子/质子比和通量。富电子脉冲耀斑和x射线硬化逐渐耀斑产生地球有效的质子将特别考虑。新的过程，如磁零点处随时间电场的加速和磁阱坍塌的第二步加速将被研究。该研究将强调分析方法以及理论预测与康普顿GRO、Yohkoh和SOHO观测结果之间的比较。总的来说，这项工作的目的是朝着在空间中耀斑和类似耀斑现象中全球磁能释放和粒子加速的统一建模迈出一步。

The investigators will study electron and proton acceleration by the electric field associated with magnetic reconnection in the solar corona. Acceleration of charged particles to energies far exceeding the thermal energy is ubiquitous in cosmic plasma, especially in solar flares. The goal is to model self-consistently the rapid conversion of the coronal magnetic energy to the kinetic energy of fast particles by virtue of the reconnection process. Parameters of reconnecting current sheets will be determined self-consistently using a system of balance equations following from conservation laws. Regimes of both turbulent and entirely collisionless reconnection will be considered. Properties of the flaring coronal plasma and flare loops will be calculated and used as a means of testing the reconnection model. The n the energies, acceleration times, electron/proton ratios, and fluxes of accelerated particles will be calculated for various conditions in the corona. Electron-rich impulsive flares and X-ray hardening gradual flares that produce geo-effective protons will be specifically considered. New processes such as acceleration in time-dependent electric fields at magnetic null points and second-step acceleration in collapsing magnetic traps will be investigated. The study will emphasize analytical methods as well as comparisons between theoretical predictions and observations by Compton GRO, Yohkoh, and SOHO. Overall, the work is intended to be a step towards a unified modeling of global magnetic energy release and particle acceleration in flares and flare-like phenomena in space.