The Sunspot Observer - Average annual indices of solar activity NGDC

Solar activity in 1990

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	30	28	31	30	31	30	31	31	30	31	30	31	30.33	30.33
W	206.69	164.66	182.41	184.27	169.42	145.63	186.84	246.42	161.64	190.32	160.22	183.94	182.15	181.87
Wn	86.46	84.22	69.95	92.43	86.12	70.31	93.08	114.68	73.00	86.90	70.07	99.54	85.67	85.56
Ws	120.23	80.44	112.46	91.85	83.30	75.32	93.76	131.74	88.64	103.42	90.16	84.40	96.48	96.31
n	10.99	9.10	9.51	9.88	8.41	8.31	10.13	12.63	10.36	10.33	8.48	9.38	9.80	9.79
A	1.19	1.52	1.29	1.15	1.15	1.69	1.36	1.35	1.46	1.71	1.26	1.42	1.38	1.38
B	1.96	1.57	1.19	1.71	1.34	1.36	1.33	1.97	1.50	1.41	1.17	1.33	1.48	1.49
C	2.25	1.94	1.72	1.95	1.61	1.75	1.71	2.89	2.62	1.68	1.66	1.73	1.96	1.96
D	1.79	1.70	1.97	2.14	1.55	1.63	1.85	2.79	1.41	2.14	1.84	2.16	1.91	1.91
E	0.61	0.40	0.27	0.37	0.62	0.13	0.45	0.76	0.19	0.33	0.18	0.28	0.38	0.38
F	0.28	0.07	0.34	0.25	0.30	0.07	0.29	0.30	0.00	0.07	0.31	0.19	0.20	0.21
G	1.09	0.46	0.75	0.68	0.50	0.57	0.93	0.90	0.69	0.89	0.85	0.97	0.78	0.77
H	0.14	0.22	0.13	0.02	0.07	0.15	0.08	0.48	0.16	0.31	0.02	0.05	0.15	0.15
I	1.68	1.24	1.84	1.61	1.27	0.95	2.14	1.21	2.33	1.80	1.20	1.25	1.55	1.54
x	3.15	3.09	2.48	2.86	2.49	3.05	2.69	3.31	2.96	3.12	2.43	2.75	2.86	2.87
r	0.55	0.37	0.26	0.41	0.46	0.37	0.36	0.62	0.40	0.50	0.37	0.44	0.42	0.42
s	2.21	1.70	1.84	2.05	1.74	1.54	2.14	1.98	3.10	2.30	1.83	1.71	2.01	2.01
a	3.89	2.81	3.53	3.64	2.60	2.40	3.31	3.93	2.92	2.56	2.65	3.06	3.12	3.11
h	0.24	0.19	0.18	0.15	0.10	0.17	0.15	0.48	0.22	0.34	0.34	0.17	0.23	0.23
k	0.95	0.95	1.21	0.76	1.02	0.78	1.49	2.31	0.77	1.52	0.87	1.25	1.17	1.16
x	3.01	2.97	3.26	2.78	2.49	2.80	3.58	3.04	3.95	3.82	2.47	2.72	3.07	3.07
o	6.65	5.20	5.07	6.08	4.55	4.72	5.25	8.00	6.07	5.62	5.21	5.75	5.68	5.68
i	1.27	0.74	1.14	0.98	1.19	0.75	1.25	1.41	0.33	0.89	0.78	0.84	0.97	0.96
c	0.05	0.19	0.04	0.04	0.18	0.04	0.06	0.17	0.01	0.00	0.03	0.07	0.07	0.07
CV	151.79	121.07	141.84	131.80	122.78	105.94	153.84	219.81	124.63	158.73	127.69	141.75	142.16	141.81
CVn	64.30	66.90	49.37	76.68	65.89	47.00	83.71	106.80	57.18	63.47	64.90	84.42	69.34	69.22
CVs	87.49	54.17	92.46	55.13	56.89	58.94	70.13	113.00	67.45	95.26	62.79	57.33	72.82	72.59