【摘要】 <正> 太阳活动对地球的影响是人们关心的重要研究课题。太阳黑子相对数作为描述太阳活动的一个参量,虽然不如射电流量密度等参量具有明确的物理意义,但是由于它有较长的观测历史以及在统计上可较好地反映太阳活动的变化,因此在较长期的太阳活动预报等工作中仍是个常用的参量,为有关部门所使用。 将上一个太阳周即第21周的种种预报极值与实际极值165.3比较,可知:一般说更多还原

【Abstract】 A suggestion has been made that solar cycles can be classified into two groups with the addition of the diagram of maximum relative sunspot numbers versus ascending periods of cycles for last 21 cycles. Using the relation between the time distance of two successive maxima of the sunspot number and the descending period, and the relation between a maximum and its asceding period, a prediction of the maximum smoothed monthly value of the relative sunspot number of solar cycle 22 is obtained which will occur in 1990.8 ± 0.4 A.D. and be 100.A comparison of the extrema of the relative sunspot number with those of the geomagnetic index A for last five cycles shows that the maxima of A, in a rough average, appear three years later than those of the relative sunspot number.更多还原