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Large Proton Anisotropies in the 18 August 2010 Solar Particle Event

机译:2010年8月18日太阳粒子事件中的大质子各向异性

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摘要

The solar particle event observed at STEREO Ahead on 18 August 2010 displayed a rich variety of behavior in the particle anisotropies. Sectored rates measured by the Low Energy Telescope (LET) on STEREO showed very large bidirectional anisotropies in 4 – 6 MeV protons for the first ∼ 17 hours of the event while inside a magnetic cloud, with intensities along the field direction several hundred to nearly 1000 times greater than those perpendicular to the field. At the trailing end of the cloud, the protons became isotropic and their spectrum hardened slightly, while the He/H abundance ratio plunged by a factor of approximately four for about four hours. Associated with the arrival of a shock on 20 August was a series of brief ( 10 minute duration) intensity increases (commonly called “shock spikes”) with relatively narrow angular distributions (∼ 45∘ FWHM), followed by an abrupt decrease in particle intensities at the shock itself and a reversal of the proton flow to a direction toward the Sun and away from the receding shock. We discuss the STEREO/LET observations of this interesting event in the context of other observations reported in the literature.
机译:2010年8月18日在STEREO Ahead观测到的太阳粒子事件显示出粒子各向异性的多种行为。由低能量望远镜(LET)在STEREO上测量的扇区速率显示,在事件的最初-17个小时内,在磁性云中,4-6 MeV质子有很大的双向各向异性,沿磁场方向的强度为几百到近1000比垂直于磁场的垂直方向大一倍。在云的尾端,质子变为各向同性,其光谱略微变硬,而He / H丰度比下降了大约四倍,持续了大约四个小时。与8月20日电击到来相关的是一系列短暂的(<10分钟持续时间)强度增加(通常称为“电击尖峰”),其角度分布相对较窄(〜45∘ FWHM),随后出现了激波本身的粒子强度突然降低,质子流向朝太阳的方向逆转,并远离后退的激波。我们将在文献中报道的其他观测结果的背景下讨论该有趣事件的STEREO / LET观测值。

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