A relation between solar activity and th
✍
Gu Zhennian
📂
Article
📅
1990
🏛
Springer Netherlands
🌐
English
⚖ 350 KB
In this paper, applying Vondrak band filter to both series of (1.o.d.) and sunspot relative number (R), we obtain variations of amplitude of 11 yr term during 1800-1985. The results show that solar cyclic signal in (1.o.d.) series is weak and unstable. The amplitude of 11 yr term in R series has lon