# 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 2019 2 28 3 30 12 13 29 10 21 20 24* 5* 23* 31* 25* Feb 2019 25 24 23 26 19 20 22 16 15 17 28 2* 1* 13* 21* Mar 2019 22 23 21 18 11 24 30 13 10 5 1 17* 2* 16* 28* Apr 2019 18 22 21 17 20 26 14 19 30 28 10* 5* 8* 3* 4* May 2019 8 19 5 21 25 31 22 12 18 17 14 11 29* 1* 2* Jun 2019 11 6 10 17 23 1 29 19 18 12 8 13* 4* 20* 14* Jul 2019 26 20 25 6 19 18 3 5 24 7 9* 10* 30* 1* 8* Aug 2019 3 19 2 29 15 4 25 14 23 21 31 5 27* 6* 30* Sep 2019 20 23 19 26 22 25 11 10 12 14 1 28 2 27 9* Oct 2019 13 23 22 3 19 15 8 6 20 17 25 26 24* 27* 10* Nov 2019 18 2 3 20 13 15 19 8 10 14 22* 24* 21* 23* 11* Dec 2019 3 29 28 30 5 2 7 17 16 24 18* 19* 11* 20* 15*