J4 ›› 2012, Vol. 11 ›› Issue (10): 20-23.
利用2010年7月15日至2010年11月15日共5个月中每天的太阳黑子群总数的数据和大理地区的紫外线强度的数据对太
阳黑子活动与大理紫外线强度的关系进行了研究。为了统计方便，规定紫外线强度“最弱、弱、中等、强、很强”分别用数字“1、2、3、4、5”代替。结果表明：黑子群总数是2时紫外线总是比较强，黑子群总数在一段时间（大约3 d以上）内持续为2时，之后总会出现紫外线极强的情况；当紫外线达到强或很强后会逐渐下降，此变化与黑子群总数变化无关。
In this paper, we study the relation between the sunspot activity and UV intensity in Dali city，using the observational
data from July 15 to November 15, 2010. The daily data of the total number of sunspot and the UV intensity data in 5 months are used in this study. The ultraviolet radiation intensity is divided into grades weakest, weak, medium, strong and very strong, and for statistical convenience, we use the number 1, 2, 3, 4 and 5 to represent them. The result shows that UV is always strong when the sunspot group total is 2. It also shows that when a total number of sunspot group in a period of time (about 3 days or more) maintains an unchanging value, i.e. 2, there will be strong ultraviolet radiation. After UV becoming strong or very strong it will gradually decline, while this change is independent of sunspot group in total.
