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MAGNETIC TOPOLOGY OF IMPULSIVE AND GRADUAL SOLAR ENERGETIC PARTICLE EVENTS

机译:脉冲和梯度太阳能能量粒子事件的磁拓扑

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We examine the magnetic topology at the Sun that leads to the two classes of impulsive and gradual solar energetic particle (SEP) events so as to address new observations that seem to blur this classification, for example, that coronal mass ejections (CMEs) can accompany events of both classes. In our model, the unusual element abundances in impulsive SEP events result from resonant stochastic acceleration in magnetic reconnection regions that incorporate open magnetic field lines, allowing both accelerated ions and ejected plasma to escape. In the large gradual events that produce classic CMEs, reconnection occurs on closed field lines beneath the CME where the accelerated particles are trapped so they plunge into the solar atmosphere to produce a flare; they cannot escape. The SEPs seen at 1 AU in these large gradual events are accelerated by the shock wave driven outward by the CME. The shock-accelerated particles are derived from the local plasma and from reaccelerated suprathermal ions from previous impulsive or gradual SEP events.
机译:我们研究了导致两类脉冲和渐进式太阳高能粒子(SEP)事件的太阳磁拓扑,以便解决似乎模糊了这种分类的新观测,例如日冕物质抛射(CME)可能伴随这两个类的事件。在我们的模型中,脉冲SEP事件中异常元素的丰度是由磁重连区域中的共振随机加速度引起的,该重合并区域合并了开放的磁力线,从而使加速离子和喷射的等离子体都逸出。在产生经典CME的大型渐进事件中,重新连接发生在CME下方的封闭磁场线上,在那里加速粒子被捕获,因此它们掉入太阳大气中产生了耀斑。他们无法逃脱。在这些大型渐进事件中,在1 AU处看到的SEP由CME向外驱动的冲击波加速。激波加速的粒子源自局部等离子体,并源自先前的脉冲式或渐进式SEP事件的重新加速的超热离子。

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