Effect of a Random Magnetic Field on the Onset Times of Solar Particle Events
Effect of a Random Magnetic Field on the Onset Times of Solar Particle Events
复制标题
随机磁场对太阳粒子事件发生时间的影响
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
J. Giacalone
中科院分区：
文献类型：
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作者：
C. Pei;J. R. Jokipii;J. Giacalone
我们展示了太阳高能粒子 (SEP) 在模型日光层磁场中移动的数值模拟结果。我们发现，给定 SEP 事件的发生时间可能比假设粒子沿着通常的帕克螺旋运动所估计的时间要早，这通常被认为是最早的时间。这是因为对于随机磁场，某些磁力线比标称（帕克螺旋）长度短。这对于粒子事件起源处的注入和/或加速的物理原理很重要。
We present the results of numerical simulations of solar energetic particles (SEPs) moving in a model heliospheric magnetic field. We find that the onset time of a given SEP event can be sooner than estimated by assuming that particles move along the usual Parker spiral, which is generally believed to be the earliest time. This is because for a random magnetic field, some magnetic field lines are shorter than the nominal (Parker spiral) length. This is important with regard to the physics of injection and/or acceleration at the origin of the particle event.