The Sunspot Observer - Average annual indices of solar activity NGDC

Solar activity in 2001

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	28	31	30	30	30	31	31	30	31	30	31	30.33	30.33
W	134.95	119.96	151.14	151.89	124.58	188.21	116.22	147.50	225.60	185.52	163.70	203.23	159.54	159.37
Wn	77.03	60.76	78.02	75.75	80.07	123.62	57.84	73.01	104.24	102.66	85.78	100.36	85.01	84.93
Ws	57.92	59.20	73.12	76.14	44.51	64.60	58.38	74.49	121.36	82.85	77.92	102.88	74.54	74.45
n	8.13	7.68	7.88	8.67	7.52	10.60	7.63	8.45	10.93	10.40	8.19	10.50	8.89	8.88
A	0.96	0.97	0.80	0.89	0.82	0.82	0.67	0.55	0.60	0.73	0.41	0.52	0.73	0.73
B	0.60	0.86	0.55	0.39	0.48	0.48	0.59	0.46	0.49	0.71	0.30	0.63	0.54	0.55
C	1.94	1.58	1.41	1.40	1.20	2.32	1.46	1.28	1.49	1.89	1.34	2.14	1.62	1.62
D	2.17	1.84	1.77	2.11	1.42	3.26	1.83	2.61	3.19	2.64	2.47	3.36	2.39	2.39
E	0.45	0.25	0.53	0.23	0.44	0.48	0.37	0.27	0.76	0.76	0.50	1.19	0.52	0.52
F	0.13	0.03	0.46	0.44	0.32	0.31	0.08	0.32	1.13	0.28	0.59	0.34	0.37	0.37
G	0.29	0.65	0.89	0.70	0.60	1.06	0.30	0.47	0.81	0.92	0.61	0.75	0.67	0.67
H	0.01	0.00	0.04	0.04	0.03	0.15	0.08	0.07	0.10	0.10	0.10	0.05	0.06	0.06
I	1.59	1.52	1.43	2.46	2.20	1.72	2.26	2.42	2.36	2.37	1.86	1.53	1.98	1.97
x	1.56	1.82	1.35	1.29	1.29	1.30	1.26	1.01	1.09	1.44	0.71	1.15	1.27	1.27
r	0.41	0.59	0.63	0.49	0.28	0.23	0.31	0.37	0.22	0.19	0.26	0.25	0.35	0.35
s	3.25	2.70	2.51	3.07	2.85	3.56	3.29	3.22	3.96	3.85	3.11	4.07	3.29	3.29
a	2.66	2.54	2.83	2.75	2.69	4.51	2.64	3.00	3.63	3.34	2.24	3.45	3.02	3.02
h	0.01	0.01	0.07	0.08	0.06	0.15	0.06	0.04	0.08	0.06	0.10	0.06	0.06	0.07
k	0.25	0.03	0.48	0.98	0.34	0.84	0.08	0.81	1.94	1.52	1.77	1.52	0.88	0.88
x	2.56	2.48	2.27	3.39	3.05	2.69	3.01	3.03	3.06	3.20	2.38	2.09	2.77	2.77
o	4.79	4.76	4.33	4.44	3.58	6.72	4.06	4.25	5.56	5.67	4.15	6.37	4.89	4.89
i	0.65	0.45	1.04	0.71	0.89	1.14	0.54	1.10	1.53	1.14	1.14	1.51	0.99	0.99
c	0.14	0.00	0.25	0.13	0.01	0.05	0.02	0.06	0.78	0.39	0.52	0.52	0.24	0.24
CV	108.56	90.21	123.28	138.10	104.40	179.32	97.55	136.78	226.01	185.92	174.58	206.01	147.80	147.56
CVn	62.03	50.56	69.30	68.30	74.58	126.11	46.69	64.12	101.10	99.01	93.55	99.22	79.61	79.55
CVs	46.53	39.65	53.99	69.80	29.81	53.22	50.85	72.66	124.90	86.91	81.03	106.80	68.20	68.01