日冕中短脉冲电子束的演化
Evolution of electron beam pulses of short duration in the solar corona
摘要：
持续时间在毫秒级的窄带射电爆发，称为尖峰，已知与太阳耀斑有关。为了了解射电尖峰现象的粒子束来源，研究了从太阳耀斑区注入日冕的电子束脉冲的演化。采用Fokker-Planck（FP）方程的数值积分来跟踪电子束脉冲的演化。模拟结果表明，短脉冲在传播到日冕的一秒钟内损失了大部分能量。低能截止区小的电子束热化速度快于低能截止区大的电子束。
英文摘要：
Narrowband radio bursts with durations of the order of milliseconds, called spikes, are known to be associated with solar flares. In order to understand the particle beams responsible for the radio spike phenomena, evolution of electron beam pulses injected from a solar flare region into the corona is studied. Numerical integration of the Fokker-Planck (FP) equation is used to follow the evolution of the electron beam pulse. The simulations show that the short duration pulses lose most of their energy within a second of propagation into the corona. Electron beam with a small low energy cut off is thermalised faster than that with a high low energy cut off.
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