# 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 1994 10 9 24 5 7 25 4K 8 23A 21A 12 17 13 14 1 Feb 1994 24 1 18A 26A 27A 28A 17A 3A 23A 2A 21 8 6 7 22 Mar 1994 4 29 31 26A 5A 27A 6A 1A 28A 20A 9 7 8 10 15 Apr 1994 30 28 27 26 29 1 22A 24A 20A 25A 3 17 4 9 2 May 1994 27 21 20 22 13A 23A 26A 19A 12A 17A 2 30 3 5 29 Jun 1994 23 24 25 16 15 22 17A 9A 8A 21A 29 26 2 12 3 Jul 1994 12 10 13 26 8 11 20 5 22 9K 16 14 2 1 15 Aug 1994 8 4 2 30 7 6 3 9 5 29 13 14 12* 15* 11* Sep 1994 30 4 23 2K 20 22K 3 18 19K 24K 7 9 8 26 27* Oct 1994 21 1 27 28 17 18 16 19A 26A 20A 3 30 23 29 7 Nov 1994 25 23 24 12 8 16 22 18 13 17K 6 26 27 20 4 Dec 1994 31 22 21 4K 18 19K 30A 5A 14A 17A 24 6 2 15 25*