The Sunspot Observer - Average annual indices of solar activity - Solar activity in 1991 - February, 1991

Statistics of sunspot activity

February, 1991

Visual indices of solar activity by author's observations

Date01020304050607080910111213141516171819202122232425262728Average%
W                              
Wn                              
Ws                              
n                              
A                              
B                              
C                              
D                              
E                              
F                              
G                              
H                              
I                              
x                              
r                              
s                              
a                              
h                              
k                              
x                              
o                              
i                              
c                              
CV                              
CVn                              
CVs