The Sunspot Observer - Average annual indices of solar activity NGDC

Solar activity in 2011

Visual indices of solar activity by National Geophysical Data Center

													Average by
month	I	II	III	IV	V	VI	VII	VIII	IX	X	XI	XII	days	months
N	31.00	28.00	31.00	30.00	31.00	30.00	31.00	31.00	30.00	31.00	30.00	31.00	30.42	30.42
W	30.34	48.08	74.33	75.38	57.02	52.80	61.12	66.91	104.63	110.55	119.31	95.10	74.70	74.63
Wn	19.90	28.70	50.50	54.48	35.17	31.36	44.14	53.34	80.81	76.47	83.53	49.87	50.74	50.69
Ws	10.45	19.37	23.83	20.90	21.85	21.44	16.97	13.57	23.82	34.08	35.78	45.23	23.96	23.94
n	2.08	2.62	3.79	4.35	4.10	3.37	4.00	4.01	6.10	6.99	7.65	6.22	4.61	4.61
A	0.26	0.40	0.51	0.78	0.79	0.63	0.76	0.69	0.50	0.65	0.67	0.55	0.60	0.60
B	0.42	0.52	0.80	0.61	0.75	0.66	0.47	0.66	0.69	0.70	0.46	0.71	0.62	0.62
C	0.38	0.41	0.48	0.94	0.69	0.64	0.86	0.60	1.51	1.22	1.83	1.39	0.92	0.91
D	0.40	0.68	0.50	0.79	0.63	0.69	0.92	0.81	1.52	1.40	1.63	1.55	0.96	0.96
E	0.03	0.40	0.75	0.45	0.03	0.09	0.19	0.35	0.30	0.38	0.26	0.16	0.28	0.28
F	0.00	0.03	0.17	0.03	0.00	0.01	0.00	0.04	0.15	0.12	0.22	0.00	0.07	0.06
G	0.02	0.04	0.22	0.25	0.06	0.15	0.05	0.20	0.23	0.38	0.39	0.26	0.19	0.19
H	0.02	0.01	0.00	0.03	0.00	0.01	0.01	0.03	0.10	0.46	0.03	0.11	0.07	0.07
I	0.56	0.13	0.37	0.46	1.14	0.51	0.74	0.64	1.10	1.69	2.16	1.49	0.92	0.92
x	0.68	0.92	1.31	1.38	1.54	1.29	1.23	1.34	1.19	1.35	1.13	1.26	1.23	1.22
r	0.16	0.28	0.31	0.34	0.22	0.25	0.26	0.31	0.55	0.45	0.66	0.43	0.35	0.35
s	1.01	0.77	0.77	1.38	1.80	1.21	1.61	1.34	2.23	2.76	4.15	2.78	1.82	1.82
a	0.21	0.42	0.60	0.76	0.43	0.39	0.63	0.40	1.14	1.04	1.26	1.06	0.70	0.70
h	0.03	0.08	0.17	0.18	0.05	0.20	0.15	0.28	0.47	0.83	0.11	0.44	0.25	0.25
k	0.00	0.14	0.63	0.30	0.06	0.03	0.13	0.33	0.52	0.56	0.35	0.26	0.28	0.28
x	0.84	0.54	0.87	1.27	1.93	1.14	1.51	1.35	1.70	2.80	2.86	2.15	1.59	1.58
o	1.00	1.34	1.65	2.19	1.82	1.86	1.94	1.88	3.60	3.24	3.92	3.38	2.33	2.32
i	0.24	0.37	0.59	0.61	0.31	0.33	0.40	0.37	0.37	0.60	0.45	0.53	0.43	0.43
c	0.00	0.37	0.68	0.28	0.03	0.04	0.15	0.40	0.42	0.34	0.42	0.16	0.27	0.27
CV	21.57	42.12	73.44	65.00	39.41	41.16	51.56	65.05	105.92	126.86	111.85	95.58	70.08	69.96
CVn	15.73	25.31	53.42	49.05	22.46	25.43	38.67	56.90	89.40	96.90	77.93	47.24	49.96	49.87
CVs	5.84	16.81	20.02	15.95	16.94	15.73	12.90	8.15	16.53	29.97	33.93	48.34	20.12	20.09