# 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 2025 26 25 30 29 27 12 24 11K 31 8A 1 4 2 17 20* Feb 2025 7 3 4 21 22 5 23K 20K 6A 25A 28 27 15 1 10 Mar 2025 3 2 31 30 20 6 29A 10A 11A 16A 26 13 22 27 12 Apr 2025 28 25 1 29 26 23 27 17A 30A 7A 16 5 21 4 15 May 2025 24 12 25 22 7A 26A 23A 19A 13A 16A 29 17 2 5 30 Jun 2025 23 6A 29A 24A 10A 17A 28A 15A 20A 21A 1 13 2 3 12