Abstract

Homogeneous series of solar cosmic-ray events for four solar-activity cycles against the background of decreased activity in cycles 23 and 24 are considered. The number of solar cosmic-ray events with energies above 10 MeV decreased insignificantly, while the number of ground-level enhancements in comparison between cycles 23 and 24 decreased by eight times. It is shown that the average contribution of flares to the generation of ground-level enhancements decreased from cycle 23 to cycle 24 by three times, and the average contribution of coronal mass ejections decreased by five times; the average contribution of flares to the generation of solar cosmic rays with energy >10 MeV decreased by 1.3 times, and the average contribution of coronal mass ejections increased by 1.4 times.

中文翻译：

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根据太阳质子事件目录中的数据，第21至第24个太阳活动周期中太阳宇宙射线的特征

摘要

考虑了在周期23和24中活动减少的背景下，四个太阳活动周期的太阳系射线事件的同质系列。能量高于10 MeV的太阳宇宙射线事件的数量没有明显减少，而相比之下，周期23和24之间地平面增强的数量减少了八倍。结果表明，火炬对地面增强作用的平均贡献从第23周期到第24周期下降了3倍，日冕物质抛射的平均贡献下降了5倍。耀斑对能量大于10 MeV的太阳宇宙射线产生的平均贡献减少了1.3倍，日冕物质抛射的平均贡献增加了1.4倍。