Which magnetic storms produce relativistic electrons at geosynchronous orbit
Which magnetic storms produce relativistic electrons at geosynchronous orbit
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DOI：
10.1029/2001ja000052
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发表时间：
2001-08
影响因子：
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通讯作者：
T. O'Brien;R. McPherron;D. Sornette;G. Reeves;R. Friedel;H. Singer
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文献类型：
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作者：
T. O'Brien;R. McPherron;D. Sornette;G. Reeves;R. Friedel;H. Singer
相对论性电子出现在地球同步环境后，一些，但不是全部，地磁风暴。识别哪些风暴产生这些电子的能力将使我们更接近于解释它们出现的机制，它将为空间气象界提供一种预测地球同步航天器的电子危害的方法。我们应用最近发展的统计技术，利用几个地球同步监测器在当地中午沿地球同步轨道产生每小时的相对论性电子条件时间序列。我们使用互相关分析来确定太阳风和磁层中的哪些参数可能影响相对论性电子的通量。然后，我们进行叠加时代分析，比较有这些电子出现的风暴和没有这些电子出现的风暴。我们以1小时的分辨率研究了这两组风暴的一些太阳风和磁层参数。特别是，持续太阳风速度超过450 km s−1，是随后出现相对论性电子的一个强有力的外部指标。在磁层中，磁暴恢复阶段长时间的pc5ulf波能升高似乎是区分那些产生和不产生相对论性电子的磁暴的最好方法。
Relativistic electrons appear in the geosynchronous environment following some, but not all, geomagnetic storms. The ability to identify which storms produce these electrons would bring us much closer to explaining the mechanism responsible for their appearance, and it would provide the space weather community with a means to anticipate the electron hazard to geosynchronous spacecraft. We apply a recently developed statistical technique to produce an hourly time series of relativistic electron conditions at local noon along geosynchronous orbit using several geosynchronous monitors. We use a cross-correlation analysis to determine what parameters in the solar wind and magnetosphere might influence the flux of relativistic electrons. We then perform a superposed epoch analysis to compare storms with and storms without the appearance of these electrons. We investigate a number of solar wind and magnetospheric parameters for these two sets of storms at 1-hour resolution. In particular, sustained solar wind velocity in excess of 450 km s−1 is a strong external indicator of the subsequent appearance of relativistic electrons. In the magnetosphere, long-duration elevated Pc 5 ULF wave power during the recovery phase of magnetic storms appears to discriminate best between those storms that do and do not produce relativistic electrons.