PAMELA任务观测到的太阳高能粒子事件
太阳与恒星天体物理
2019-07-16 v1
摘要
尽管近年来取得了显著进展，太阳高能粒子（SEPs）起源的物理机制仍存在争议。粒子加速与传输的复杂性给建立涵盖空间仪器观测的低能（从数十keV到数百MeV）数据与全球中子监测网在地面增强（GLEs）中探测到的GeV粒子在内的SEP事件统一图像带来了挑战。反物质物质探测与轻核天体物理载荷（PAMELA）卫星实验收集的高精度数据提供了研究80 MeV至数GeV之间SEP通量的独特机会，显著改进了对最剧烈事件的表征。特别是，PAMELA首次能以良好精度测量中高能处的能谱特征，为当前SEP模型提供重要约束。此外，PAMELA观测得以研究中低能粒子与高能粒子间的关系，从而更清晰地认识SEP起源。未观测到GLE、亚GLE和非GLE事件能谱形状之间的定性区别，表明GLE并非单独一类，而是高能处更强、连续的SEP事件分布的一个子集。虽然所发现的能谱形式与扩散激波加速理论一致（该理论预测高能处能谱翻转，归因于加速过程中粒子逃离激波区），但还需进一步工作以探究加速与传输过程对SEP能谱的相对影响。
引用
@article{arxiv.1807.10183,
title = {Solar energetic particle events observed by the PAMELA mission},
author = {A. Bruno and G. A. Bazilevskaya and M. Boezio and E. R. Christian and G. A. de Nolfo and M. Martucci and M. Merge' and V. V. Mikhailov and R. Munini and I. G. Richardson and J. M. Ryan and S. Stochaj and O. Adriani and G. C. Barbarino and R. Bellotti and E. A. Bogomolov and M. Bongi and V. Bonvicini and S. Bottai and F. Cafagna and D. Campana and P. Carlson and M. Casolino and G. Castellini and C. De Santis and V. Di Felice and A. M. Galper and A. V. Karelin and S. V. Koldashov and S. Koldobskiy and S. Y. Krutkov and A. N. Kvashnin and A. Leonov and V. Malakhov and L. Marcelli and A. G. Mayorov and W. Menn and E. Mocchiutti and A. Monaco and N. Mori and G. Osteria and B. Panico and P. Papini and M. Pearce and P. Picozza and M. Ricci and S. B. Ricciarini and M. Simon and R. Sparvoli and P. Spillantini and Y. I. Stozhkov and A. Vacchi and E. Vannuccini and G. I. Vasilyev and S. A. Voronov and Y. T. Yurkin and G. Zampa and N. Zampa},
journal= {arXiv preprint arXiv:1807.10183},
year = {2019}
}
备注
26 pages, 13 figures, 2 tables