We examine the release times of energetic electrons in the 2001 April 25 event. An M2.7 flare occurred on 2001 April 25, from AR 09433, located at N18W09. The flare was observed in X-rays by GOES and the Yohkoh spacecraft. The Yohkoh observation also included hard X-ray (HXR) images for all four energy channels: L, M1, M2, and H. We use Yohkoh observation times as a proxy for the release time of energetic electrons that propagated downward, which are responsible for the HXRs. In situ >∼25 keV electrons were observed by the Wind spacecraft. For these electrons, we obtain the release time at the Sun using the recently developed Fractional Velocity Dispersion Analysis method. We find that the release times of outward-propagating energetic electrons are clearly delayed from those that propagated downward. Furthermore, these delayed releases are energy dependent. The implication of this delay on the underlying acceleration and trapping process of the >∼25 keV electrons at solar...

中文翻译：

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脉冲太阳高能电子事件中两个不同电子种群的识别

我们研究了2001年4月25日事件中高能电子的释放时间。2001年4月25日，位于N18W09的AR 09433发生了M2.7耀斑。GOES和Yohkoh航天器在X射线中观察到了耀斑。Yohkoh观测还包括所有四个能量通道（L，M1，M2和H）的硬X射线（HXR）图像。我们使用Yohkoh观测时间作为向下传播的高能电子释放时间的代理，这是负责任的用于HXR。风飞船观测到了原位>〜25 keV电子。对于这些电子，我们使用最近开发的分数速度色散分析方法获得了在太阳处的释放时间。我们发现，向外传播的高能电子的释放时间明显地从向下传播的那些开始被延迟了。此外，这些延迟释放取决于能量。这种延迟对太阳光下大于25 keV电子的潜在加速和俘获过程的影响。