# DOI: https://doi.org/10.5880/Kp.0001 # LICENCE: CC BY 4.0, please cite: # Matzka, J., Bronkalla, O., Tornow, K., Elger, K. and Stolle, C., 2021. # Geomagnetic Kp index. V. 1.0. GFZ Data Services, # https://doi.org/10.5880/Kp.0001 # Matzka, J., Stolle, C., Yamazaki, Y., Bronkalla, O. and Morschhauser, A., # 2021. The geomagnetic Kp index and derived indices of geomagnetic activity. # Space Weather, https://doi.org/10.1029/2020SW002641 # The Kp index was introduced by Bartels (1949) and is produced by Geomagnetic # Observatory Niemegk, GFZ German Research Centre for Geosciences. International Quietest Days Most Disturbed Days Month Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 D1 D2 D3 D4 D5 Jan 1986 16 13 14 11 19 5 12 4 15 17K 27 7 28 25 1 Feb 1986 4 15 16K 1 3 2 5A 19A 17A 10A 8 9 7 23 21 Mar 1986 10 11 20 9 30 17 16 31A 12A 29A 6 7 25 8 24 Apr 1986 4 14 27 6 30 7 20 13 2 8 10* 3* 9* 24* 22* May 1986 14 28 22 15 29 13 1 9 18 20 6 2 3 4* 31* Jun 1986 25 26 23 15 5 16 6 19 12 20 27 28* 1* 10* 7* Jul 1986 11 20 15 14 7 19 23 6 16 18 26 27* 29* 25* 2* Aug 1986 18 7 16 19 2 17 14 1 10 15 22 21 30 23 29 Sep 1986 22 8 7 30 10 9 3A 16A 4A 6A 12 23 26 25 24 Oct 1986 24 12 10 26 11 25 7 23 8 16 14 13 2 19 5* Nov 1986 22 21 9 8 19 14 10 28 20 13 4 25 24 5 3* Dec 1986 29 15 8 28 5K 6 12 17 30 18K 23 14 26* 1* 22*