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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Effect of magnetic discontinuities on the propagation of energetic particles: Ulysses observations of the onset of the March 1991 solar particle event
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Effect of magnetic discontinuities on the propagation of energetic particles: Ulysses observations of the onset of the March 1991 solar particle event

机译：磁间断对高能粒子传播的影响：尤利西斯（Ilysses）对1991年3月太阳粒子事件开始的观测

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摘要

We present observations of energetic ions from the Cosmic Ray and Solar particle Investigation (COSPIN) and Heliosphere Instrument for Spectra Composition and Anisotropy at Law Energy (HISCALE) instruments on board the Ulysses spacecraft. We examine ill detail the onset of energetic ions observed during the March 1991 series of solar events. Active region 6555, at E28 at 2247 UT on March 22, 1991 (day 81), was most likely responsible for the high-energy protons subsequently seen at Ulysses. A slow increase in the high-energy (similar to 50 MeV) proton intensity, made up of many small but rapid intensity increases, began around 9 hours after the onset of the event, taking 1.5 days to reach maximum intensity. On the flank, and in front of a coronal mass ejection (CME), coming From a previous event, we observed a region with a drop in the magnetic field strength. This region was populated with hot shocked plasma and, owing to the low magnetic field pressure, had an ion plasma beta >1. Mirror mode waves, with discontinuities appearing at the edges of the waves, produced a larger-than-average number of magnetic field discontinuities, a large fraction of the discontinuities being aligned with their normals oriented along the radial direction, suggesting that they were being convected outward by the CME. These discontinuities acted as a series of barriers to the propagation of the energetic solar particles coming from the solar event, delaying substantially the onset of the particle event at Ulysses. [References: 15]
机译：我们介绍了来自宇宙射线和太阳粒子研究（COSPIN）的高能离子的观测结果，以及在尤利西斯号航天器上的法线能量光谱组成和各向异性的日光层仪器（HISCALE）的仪器。我们没有详尽地研究1991年3月系列太阳事件中观察到的高能离子的发生。 1991年3月22日（第81天）在E28的2247 UT（第81天）处的活动区域6555最有可能是造成后来在尤利西斯出现的高能质子的原因。事件发生后约9小时开始，高强度（约50 MeV）质子强度的缓慢增加由许多微小但迅速的强度增加组成，需要1.5天才能达到最大强度。在前一个事件的侧面，在日冕物质抛射（CME）的前面，我们观察到一个磁场强度下降的区域。该区域充满了热冲击等离子体，由于磁场压力低，其离子等离子体β> 1。镜像模式波在波的边缘出现不连续性，产生的磁场不连续性数量多于平均数量，其中大部分不连续性与沿径向方向的法线对齐，表明它们已被对流由CME向外发送。这些不连续性成为来自太阳事件的高能太阳粒子传播的一系列障碍，大大延迟了尤利西斯粒子事件的开始。 [参考：15]

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