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Solar Cycle 18 - Top 50 geomagnetic storms

On this page you will find an overview of the strongest geomagnetic storms from Solar Cycle 18 together with links to more information in our archive. The Kp-values on this page are the official, finalized Kp-values from the GFZ in Potsdam, Germany. Times are in UTC.

Ap Kp max00-03h03-06h06-09h09-12h12-15h15-18h18-21h21-00h
11946/09/2219894-8+8-9-98+76
21946/07/2715299-9-97-5+4-4-2+
31946/03/282139-568+9-9-9-8+8
41946/03/251959-8-7+7+8-8+9-8-8-
51949/01/251569-9-87-4+568+8+
61949/05/121539-227+7+8+9-8+7
71946/02/081189-9-8-7+76-6-43
81946/04/231179-4-45+66+8-8-9-
91947/04/171009-4-4-2-2-6+7-9-8+
101951/10/28989-0+4-3+5+789-5
111946/07/26799-4-434-3+3+9-8
121950/02/20799-2+3-2-2+359-8+
131951/09/26739-9-8-4+4-3-3+2+3-
141949/10/151568+667+87+7+8+8-
151948/03/151408+6-8+87+6+78-5
161950/08/191368+6-4+6-6+88+8-8
171947/03/031288+757-76+6-8+8
181946/02/071278+4-248+8-878
191951/09/251168+4-5-5-5+7+8-88+
201950/08/201088+8+88-8-43+2+2
211949/01/261008+8+876-555-4
221946/04/24998+8+7+7-6+4+7-5-3+
231952/04/21948+3-3+448+876+
241944/04/02888+4+588+6454
251948/10/18868+8+7-5+4-4-45+7+
261944/12/16838+44-4+688+53
271947/08/22718+3-458+6+65-4+
281948/10/17358+10+3+1+0+0+2+8+
291946/09/2314687+8-86+7867-
301946/03/24117888-56-7+83+5+
311952/03/0682887+6+5-4+455+
321952/06/307885+88-74-2+2-2+
331952/05/2772886-5-5+4+5+6-5
341947/07/1768811-1-21+788-
351949/05/1359887+3+25+3+12+
361951/06/173882+1+2-11-5-4+8
371948/08/081468-5+7-7+8-8-78-8-
381946/09/181368-7+7+8-7777+5
391947/09/251008-8-7+7+666-55-
401948/10/19948-7-7+8-7+5+5+4+2+
411949/10/14918-4-4+56+6-7+8-7
421949/03/22908-78-7-7-5-6-6-3+
431947/03/08908-23+5+6-8-7+7-7
441951/07/02828-7+8-7-645-45-
451952/03/31808-8-67-5+465+5
461950/02/21798-7+8-6+5-5+5-4+5-
471950/08/08718-8-6+8-53+3-3-4
481951/04/18668-114+78-655
491951/09/19598-32+4-4-5+8-75-
501953/05/15558-133-2+5+5+8-7-
© Potsdam - CC BY 4.0 - Matzka, J., Stolle, C., Yamazaki, Y., Bronkalla, O. and Morschhauser, A., 2021. - ©WDC for Geomagnetism, Kyoto
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