Geomagnetic Storms of 1987

26 storms

26 geomagnetic storms of G1 or more began in 1987: 12 G1, 13 G2, 1 G3, 0 G4, 0 G5. The strongest began July 28, 1987 and reached Kp 7, rank 466 of every storm since 1932.

By month

Every storm of 1987

Times are UT, when the first block at Kp 5 or more began.

Began (UTC)	Level	Peak Kp	Hours	Highest daily Ap
Feb 20, 09:00	G1 Minor	5	3	29
May 24, 21:00	G2 Moderate	6-	9	25
Jun 6, 06:00	G1 Minor	5	3	25
Jul 28, 12:00	G3 Strong	7	27	52
Jul 31, 03:00	G1 Minor	5	3	14
Aug 13, 06:00	G2 Moderate	6-	3	23
Aug 25, 12:00	G2 Moderate	6	18	40
Aug 31, 06:00	G2 Moderate	6-	24	34
Sep 10, 12:00	G2 Moderate	6+	33	40
Sep 13, 15:00	G1 Minor	5	12	26
Sep 15, 21:00	G1 Minor	5	3	29
Sep 22, 21:00	G2 Moderate	6+	6	29
Sep 25, 12:00	G2 Moderate	6	12	46
Sep 28, 00:00	G1 Minor	5	3	22
Sep 29, 12:00	G2 Moderate	6	30	43
Oct 3, 12:00	G2 Moderate	6	9	36
Oct 11, 15:00	G2 Moderate	6-	6	29
Oct 14, 15:00	G2 Moderate	6-	3	31
Oct 24, 18:00	G1 Minor	5+	15	29
Oct 27, 21:00	G2 Moderate	6-	21	45
Nov 2, 18:00	G1 Minor	5+	6	23
Nov 3, 18:00	G1 Minor	5+	3	27
Nov 12, 00:00	G1 Minor	5	3	20
Nov 23, 06:00	G1 Minor	5+	15	35
Dec 10, 15:00	G1 Minor	5+	6	29
Dec 16, 03:00	G2 Moderate	6-	6	39

1986 1988 The strongest on record Tonight’s aurora forecast

Sources

Kp and ap from GFZ Helmholtz Centre for Geosciences, Geomagnetic Observatory Niemegk, licensed CC BY 4.0: Matzka, J., Stolle, C., Yamazaki, Y., Bronkalla, O. and Morschhauser, A., 2021, The geomagnetic Kp index and derived indices of geomagnetic activity, Space Weather, doi:10.1029/2020SW002641; data doi:10.5880/Kp.0001. Storms, levels and aurora reach worked out by WeatherOverTime from those values and NOAA’s space weather scales. Definitive through August 31, 2026; later values are preliminary. Rebuilt 2026-09-24.