IUGG: Association of Geomagnetism and Aeronomy

(International Service of Geomagnetic Indices)

September 2026

International quiet and disturbed days

Geomagnetic Planetary Indices

Kp three-hourly									daily
	1	2	3	4	5	6	7	8	Sum	Ap	Cp
1	1-	1+	2-	2+	1+	2-	2o	1+	12+	6	0.3
2	1-	1o	2o	2o	2-	1o	2-	1o	11o	5	0.2
3	2-	1o	0+	1-	1o	2o	2o	1+	10o	5	0.2
4	1o	1-	1-	1+	1-	1-	1-	0o	6-	3	0.1
5	2-	3-	2o	2o	1-	1-	1-	1o	11+	6	0.3
6	1-	1-	1-	1o	1-	1o	2o	1+	8o	4	0.1
7	1-	2-	3+	4-	3o	4-	4-	5-	24+	18	1.0
8	5-	4+	5o	4-	3o	4+	3o	3+	31+	28	1.2
9	2+	1+	2-	2+	3o	3o	3-	3-	19o	10	0.6
10	3-	2+	1+	3-	2+	1+	1o	3-	16+	8	0.5
11	1o	3-	2-	2+	2o	1+	1-	2o	14-	7	0.3
12	1+	2+	3-	2-	2-	1+	1+	0+	13-	6	0.3
13	2o	3o	2-	0+	1o	1-	0+	1-	10-	5	0.2
14	1o	2o	2-	2o	3-	4o	3-	3+	19+	12	0.7
15	3-	2+	0o	0+	2+	1-	2o	3o	13+	7	0.4
16	3+	3-	2o	2o	2o	1-	0+	1+	14+	8	0.4
17	2+	2o	1+	1+	3o	2+	2o	2o	16+	8	0.4
18	1o	2-	2-	1+	1-	1-	1o	1+	9+	4	0.2
19	2o	3-	1+	1o	1o	1+	1+	2-	12+	6	0.3
20	2o	3-	2-	0+	0+	0+	0+	1o	9-	5	0.2
21	1+	1-	0o	0o	0o	0o	0+	1o	3+	2	0.0
22	2-	0+	0o	0o	0o	1-	1-	1-	4o	2	0.0
23	0+	0o	0o	0+	0o	0+	1+	2-	4o	2	0.0
24	3-	2o	3-	4o	3+	3+	2o	3-	23-	14	0.8
25	4-	3+	4-	4o	3+	3-	3o	4o	28-	20	1.0
26	3+	3+	2+	3-	1+	1o	2o	2+	18+	10	0.6
27	4o	3-	1+	1o	1o	1-	1-	0o	11+	7	0.4
28	0o	1+	0+	1-	1-	1-	1o	0+	5o	3	0.0
29	2-	0o	0+	1o	0+	1-	0+	1-	5o	3	0.0
30	1-	0+	0o	1-	1-	0+	0+	0+	3+	2	0.0
									Mean	8	0.36

Preliminary sudden commencements: none