sunspot cycle

We Summarize the theoretical studies of long-term solar activity on sunspot cycle, extended cycle, the prediction of solar activity and the asymmetric distribution of solar activity on the hemisphere and present the results of our studies on the long-term solar activity.

本文综述了太阳活动周期、太阳活动延伸周、太阳活动预报和太阳活动在日面上分布等有关太阳长期活动规律的理论研究；

Observation and Study for the Sunspot of the 22-nd Solar Activity Cycle

第22周太阳黑子的观测与研究

In this paper, The mean of a month, mean of a year for the number of sunspots are worked out by the observations of sunspot from 1986 to 1995 in Beijing Planetarium, and we also study and analyze the solar activity of the 22-nd Cycle.

就北京天文馆天文台1986～1995年内的太阳黑子观测资料进行整理，得到黑子数的月均值、年均值，并对本周太阳活动性作了分析研究。

The sunspot active regions for the 22nd solar cycle solar cells

第22周以来的太阳黑子活动区

The sunspot number of Cycle 21 attained its peak 165.3 at 1979.9. To judge on various prediction results of Cycle 21, the criterion 165.3 ± 16.5 and 1979 ± 0.5 year are suggested.

第21周的太阳黑子数于1979.9（1979年12月）到达它的峰值165.3。本文提出用165.3±16.5和1979.9±0.5年的容许变幅，来检验第21周多种多样的预测结果。

The response of sea-level pressure to the sunspot cycle for last one hundred years

北半球海平面气压对太阳黑子11年周期的响应