The Sunspot Observer - Average annual indices of solar activity - Solar activity in 1990 - September, 1990

Statistics of sunspot activity

September, 1990

Visual indices of solar activity by author's observations

Date	01	02	03	04	05	06	07	08	09	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	Average	%
W					108													157													132.50	100
Wn					62													49													55.50	41.89
Ws					46													108													77.00	58.11
n					8													9													8.50	100
A					0													0													0.00	0.00
B					2													3													2.50	29.41
C					1													2													1.50	17.65
D					1													1													1.00	11.76
E					0													0													0.00	0.00
F					0													0													0.00	0.00
G					0													0													0.00	0.00
H					4													3													3.50	41.18
I					0													0													0.00	0.00
x					2													3													2.50	29.41
r					1													0													0.50	5.88
s					4													4													4.00	47.06
a					1													1													1.00	11.76
h					0													0													0.00	0.00
k					0													1													0.50	5.88
x					4													3													3.50	41.18
o					4													5													4.50	52.94
i					0													1													0.50	5.88
c					0													0													0.00	0.00
CV					71													105													88.00	100
CVn					39													22													30.50	34.66
CVs					32													83													57.50	65.34