# 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 2000 21 17 18 9 8 19K 16 15 10K 25A 28 1 29 11 23 Feb 2000 18 19 4 17 20K 22 29A 16A 2A 1A 12 6 14 7 24 Mar 2000 15 16 26 27 4 21 28 9 17 13 31 1 12* 7* 8* Apr 2000 26 14 22 18 25 15 23 13K 12A 11A 7 6 4 16 24 May 2000 8 11 20 7 21 10 4 18A 19A 9A 24 25 17 23 29 Jun 2000 30 16 9 25K 17 21K 2 20 19K 29A 8 26 14 23 5 Jul 2000 2 7 24 6 25 9 8 21A 1A 27A 15 14 16 20 11 Aug 2000 22 25 18 19 26 20 9 17 8 27A 12 11 29 28 5 Sep 2000 10 14 11 9 22 23A 3A 29A 5A 13A 18 17 30 19 16 Oct 2000 20 8 21 9 6 27 7 25 12K 26A 5 4 14 29 13 Nov 2000 17 16 15 3 2 14 18K 30 23 25K 6 29 7 27 10 Dec 2000 15 31 14 20 30 2 16 21 5 13 23 8* 9* 7* 10*