Sunspot Daily Dataset (without Missing Values)

This dataset contains a single very long daily time series of sunspot numbers from 1818-01-01 to 2020-05-31. The original dataset contains missing values. The leading missing values were replaced by zeros and the remaining missing values were replaced by carrying forward the corresponding last observations (LOCF method).本数据集包含一条覆盖1818年1月1日至2020年5月31日的超长每日太阳黑子数时间序列。原始数据集存在缺失值，其中前置缺失值采用0进行填充，其余缺失值则通过末次观测值结转法（Last Observation Carried Forward，LOCF）完成填补。