IUGG: Association of Geomagnetism and Aeronomy

(International Service of Geomagnetic Indices)

December 2025

International quiet and disturbed days

Geomagnetic Planetary Indices

Kp three-hourly									daily
	1	2	3	4	5	6	7	8	Sum	Ap	Cp
1	4-	1-	2-	2-	2o	3o	2o	1+	16o	9	0.5
2	2o	3-	1-	2-	1o	2o	3-	2o	15-	7	0.4
3	1o	2+	2-	3-	4o	4+	7-	5o	28-	31	1.3
4	5o	5o	5-	4+	4o	4o	4-	3o	34-	32	1.3
5	3o	3+	3+	3-	2+	2+	3+	3-	23o	14	0.8
6	3+	4-	4o	3o	3-	2+	2o	2-	23-	14	0.8
7	2+	3+	3o	2+	1+	0o	0o	0o	12+	7	0.4
8	0o	0+	0o	0o	0o	0o	1o	0+	2-	1	0.0
9	1-	0o	1-	1-	1+	1+	1+	1o	7o	4	0.1
10	2o	2+	3+	1+	2o	2+	3o	6o	22+	19	1.0
11	6o	5-	2+	2o	2o	4-	5-	3o	28+	27	1.2
12	4o	4o	3o	3+	3o	4o	5o	5-	31o	27	1.2
13	5-	2+	2o	2+	2+	2+	3+	2+	22-	14	0.8
14	3-	2o	1o	2-	1o	1o	1+	1-	11+	6	0.3
15	1-	0+	1o	1+	3o	1+	0+	1+	9+	5	0.2
16	3o	2+	2-	2o	2+	3o	2+	3-	19+	10	0.6
17	2+	3o	3-	2+	3-	3-	4o	5-	24+	17	0.9
18	4+	3-	4-	3+	2o	3o	3o	3-	25-	17	0.9
19	2+	2o	1+	1-	1o	2-	2o	2-	13-	6	0.3
20	2o	1-	1+	1o	2-	2o	2-	2-	12o	6	0.2
21	3+	3-	3o	4-	5-	5-	3+	5-	30o	25	1.2
22	3+	3+	3+	3o	5-	4-	4-	4+	29+	23	1.1
23	3o	4-	3+	3+	3+	3+	4o	4o	28o	20	1.0
24	4o	4+	4-	3-	3+	3+	3o	3-	27o	20	1.0
25	3o	3o	3o	2o	2+	2+	1+	2-	19-	10	0.6
26	1+	2+	2o	2o	2+	3+	1-	1o	15o	8	0.4
27	1o	3-	2-	2-	1o	1o	2+	2-	13o	6	0.3
28	2o	1-	1-	2o	2o	3-	2+	2o	14+	7	0.3
29	3o	3-	2+	2+	2o	1o	0+	2o	16-	8	0.4
30	1+	2-	2-	1+	3o	3-	2o	1o	15-	8	0.4
31	2o	1+	2o	2-	3+	1+	1o	1o	14-	7	0.4
									Mean	13	0.65

Preliminary sudden commencements: none