This is an approximately 200-year solar cycle, believed to be one of the most intense. Raspopov et al. (2008) Pal., Pal., Pal. 259, 6 find that palaeoclimatic reconstructions correlate well with these variations in solar activity.
科学参考收录了60776条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。