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

Statistics of sunspot activity

June, 1991

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			255			284																178	156	164		235	248	301	342		240.33	100
Wn			179			222																52	72	95		142	152	146	193		139.22	57.93
Ws			76			62																126	84	69		93	96	155	149		101.11	42.07
n			11			11																8	6	10		10	10	10	11		9.67	100
A			1			0																1	0	2		0	0	1	2		0.78	8.05
B			2			1																1	0	1		2	1	1	3		1.33	13.79
C			0			2																1	3	4		3	2	0	2		1.89	19.54
D			2			3																2	2	1		3	2	4	1		2.22	22.99
E			2			1																1	0	0		0	1	0	0		0.56	5.75
F			0			0																0	0	0		0	0	1	2		0.33	3.45
G			1			0																0	0	0		0	0	0	0		0.11	1.15
H			3			3																1	1	2		1	1	1	1		1.56	16.09
I			0			1																1	0	0		1	3	2	0		0.89	9.20
x			3			1																2	0	3		2	1	2	5		2.11	21.84
r			0			0																0	0	0		1	1	2	1		0.56	5.75
s			4			6																2	4	5		6	7	3	1		4.22	43.68
a			1			2																3	0	2		0	0	2	1		1.22	12.64
h			0			0																0	1	0		0	0	0	1		0.22	2.30
k			3			2																1	1	0		1	1	1	2		1.33	13.79
x			4			4																3	1	4		2	4	4	3		3.22	33.33
o			3			4																3	3	4		6	3	3	6		3.89	40.23
i			2			1																2	2	2		2	3	2	1		1.89	19.54
c			2			2																0	0	0		0	0	1	1		0.67	6.90
CV			241			225																122	154	89		142	159	166	185		164.78	100
CVn			137			147																30	80	53		89	92	114	110		94.67	57.45
CVs			104			78																92	74	36		53	67	52	75		70.11	42.55