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arXiv 1902.06602astro-ph.SRphysics.space-ph
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Helios航天器测量的太阳相对论电子事件的完全反演

Full inversion of solar relativistic electron events measured by the Helios spacecraft

Daniel Pacheco, Neus Agueda, Angels Aran, Bernd Heber, David Lario, .

摘要:

迄今为止,最大的内日球层SEP事件数据集是由两个Helios航天器观测的。我们重新访问了15个太阳相对论电子事件的样本测量的太阳神任务的目标,更好地描述注入历史的太阳高能粒子和他们的行星际运输条件在日心距离<1 AU。Helios上的E6仪器提供的测量结果为我们提供了八个不同扇区的电子方向分布,我们可以用这些扇区来推断电子俯仰角分布的详细演变。Monte Carlo行星际运输模型的结果,结合一个完整的反演程序,被用来拟合观测到的定向强度在300-800千电子伏的标称能量通道。与以前的研究不同,我们考虑了探测器的能量和角度响应。这种方法使我们能够推断电子释放时间的来源,并确定电子行星际传输条件。我们讨论的持续时间的释放时间曲线和径向平均自由程的值,并将它们与以前在文献中使用早期的方法报道的值进行比较。其中五个事件显示太阳的短注入历史(<30分钟),十个事件显示长持续(>30分钟)的注入。平均自由程的值范围为0.02 AU至0.27 AU。推断的注入历史与文献中发现的无线电和软X射线发射相匹配。我们发现径向平均自由程不依赖于径向距离。此外,我们发现行星际散射的强度和太阳粒子释放的大小之间没有明显的关系。

英文摘要:

Up to present, the largest data set of SEP events in the inner heliosphere are the observations by the two Helios spacecraft. We re-visit a sample of 15 solar relativistic electron events measured by the Helios mission with the goal of better characterising the injection histories of solar energetic particles and their interplanetary transport conditions at heliocentric distances <1 AU. The measurements provided by the E6 instrument on board Helios provide us with the electron directional distributions in eight different sectors that we use to infer the detailed evolution of the electron pitch-angle distributions. The results of a Monte Carlo interplanetary transport model, combined with a full inversion procedure, were used to fit the observed directional intensities in the 300-800 keV nominal energy channel. Unlike previous studies, we have considered both the energy and angular responses of the detector. This method allowed us to infer the electron release time profile at the source and determine the electron interplanetary transport conditions. We discuss the duration of the release time profiles and the values of the radial mean free path, and compare them with the values reported previously in the literature using earlier approaches. Five of the events show short injection histories (<30 min) at the Sun and ten events show long-lasting (>30 min) injections. The values of mean free path range from 0.02 AU to 0.27 AU. The inferred injection histories match with the radio and soft x-ray emissions found in literature. We find no dependence of the radial mean free path on the radial distance. In addition, we find no apparent relation between the strength of interplanetary scattering and the size of the solar particle release.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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