标题： 日冕尾部磁重联作为宇宙射线过剩的成因 显示英文标题

标题： Magnetic reconnection as the cause of cosmic ray excess from the heliospheric tail

摘要： 在数十亿电子伏特以下能区观测到来自日球层尾部方向（Nagashima 等人，1998年）的广域超额宇宙线，以及由MILAGRO合作组发现的两个多万亿电子伏特宇宙线显著局域超额区域（同样来自天空中的同一区域，Abdo 等人，2008年），引发了关于这些宇宙线起源的问题。特别是，最显著的局域超额区域与日球层尾部方向的一致性，以及观测到的各向异性的小角尺度（~10度）暗示了本地起源，并可能与低能广域超额有关联。提出磁尾磁场重联作为高能粒子加速的一种可能来源。 显示英文摘要

摘要： The observation of a broad excess of sub-TeV cosmic rays compatible with the direction of the heliospheric tail (Nagashima et al. 1998) and the discovery of two significant localized excess regions of multi-TeV cosmic rays by the MILAGRO collaboration (Abdo et al. 2008), also from the same region of the sky, have raised questions on their origin. In particular, the coincidence of the most significant localized region with the direction of the heliospheric tail and the small angular scale of the observed anisotropy (~ 10deg) is suggestive a local origin and of a possible connection to the low energy broad excess. Cosmic ray acceleration from magnetic reconnection in the magnetotail is proposed as a possible source of the energetic particles.