# 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. Quietest Days Most Disturbed Days Month Q1 Q2 Q3 Q4 Q5 Q6 Q7 Q8 Q9 Q10 D1 D2 D3 D4 D5 Jan 1960 30 31 1 9 2 8 28 16K 3 7 21 14 10 15 11 Feb 1960 25 24 7 9K 10 26K 28 12K 11A 1A 14 18 16 17 21 Mar 1960 7 20 23 22 13 27K 25K 26A 21A 14A 31 16 11 2 3 Apr 1960 20 21 19 22 14A 9A 23A 8A 6A 26A 1 30 28 24 3 May 1960 20 22 4 19 18 21 3A 15A 5A 13A 8 6 29 7 1 Jun 1960 2 11 12 16 10 13K 17A 20A 3A 15A 27 30 4 28 29 Jul 1960 8 25 9 7 27 28 10A 26A 24A 23A 15 16 14 31 19 Aug 1960 5 25 26 24K 4A 6A 3A 7A 23A 13A 17 30 29 16 21 Sep 1960 1 16 19 15 25 20 28A 21A 17A 26A 5 4 3 7 30 Oct 1960 22 14 23 13 12 16 17A 21A 20A 10A 6 7 25 26 1 Nov 1960 8 9 18K 19K 7K 6 10K 29A 20A 5A 13 16 15 4 12 Dec 1960 4 14K 17A 25A 11A 3A 5A 10A 13A 23A 1 27 15 16 18 Jan 1961 11 4 31 2 5 30 3 14K 10 12 20 9 19 8 22 Feb 1961 2 12 1 26 25 10 15A 14A 9A 11A 18 4 20 16 17 Mar 1961 4 7 25 8 3K 29 11 31K 12A 2A 10 19 6 14 15 Apr 1961 21 17 18 5K 4K 8 29K 20A 28A 19A 15 14 3 11 9 May 1961 18 3 15 29 21 27 26A 17A 10A 24A 25 6 16 7 31 Jun 1961 11 13 30 28 10 14K 24 17 26K 9 21 22 1 2 29 Jul 1961 12 31 30A 29A 11A 9A 1A 8A 22A 2A 27 18 14 13 5 Aug 1961 22 23 13 9 7 21 18 24 16 17 2 30 31 11 4* Sep 1961 21 23 19 7 8 6 28K 4 29 22 24 25 14 1 30 Oct 1961 16 18 17 10 15 9 5 3 6 31K 28 1 27 26 29 Nov 1961 15 23 30 24 22 29 28 11 16K 27 18 7 8 5* 17* Dec 1961 19 8 25 18 20 9 21 26 16 17 2 3 1 28* 30* Jan 1962 5 23 4 22 24 31 3 18 28 7 10 19* 11* 16* 27* Feb 1962 1 10 28 19 8 20 3 2 9K 6K 16 12 7 4 26* Mar 1962 9 30 8 27 16 22K 17 28 31 26 6 12* 5* 21* 19* Apr 1962 14 24 30 13K 29 5A 16A 19A 27A 17A 7 8 22 10 6 May 1962 25 24 18 23 4 21 30 9 22 17 6 31 15* 14* 13* Jun 1962 17 18 8 20 19 2 13 3 11 16K 9 27* 28* 10* 23* Jul 1962 17 16 18 30 9 15K 22A 12A 3A 2A 26 27 4* 28* 5* Aug 1962 11 12 20 28 27 13K 4 21A 26A 5A 1 8 22 17 31 Sep 1962 18 24K 25A 17A 28A 11A 27A 16A 10A 9A 12 3 19 4 2 Oct 1962 17A 12A 31A 15A 4A 5A 20A 13A 3A 7A 1 25 8 26 9 Nov 1962 18 13 20 12 10 19K 9K 5K 26K 28A 22 30 16 15 6 Dec 1962 7 2 6 25 23 30 3 16 24 29 19 18 17 20 11 Jan 1963 6 9 27 28 2 3 26 10 8 21 31 14 30 13 15 Feb 1963 8 19 24 2 27 18 3 6 5 7 10 13 11 14* 12 Mar 1963 27 16 22 26 14 30 15 4 25 5 10 8 11 9* 1* Apr 1963 10 24 28 11 21 29 2 25 3 26 5 6* 30 4* 14* May 1963 24 22 23 18 16K 21K 19 15 7 26K 1 2 13 4* 29 Jun 1963 5 16 23 22 4 12 10 13 14 11 7 26 25 18 27* Jul 1963 3 2 15 29 14 12 13 1 19 11 24 30 21 23 31* Aug 1963 13 14 11 12 16 8 10A 15A 25A 22A 20 18 28 21 19 Sep 1963 7 4 2A 13A 6A 10A 5A 3A 30A 12A 22 14 25 23 28 Oct 1963 22 2 1 27 3 23 6 17 19 18 29 24 12 30 14 Nov 1963 5 21 19 16 18 26 27 15 13 20K 8 7 9 10 24 Dec 1963 10 11 18 31 25 12 26 17 27 1 3 5 4 6 20 Jan 1964 14 15 21 22 23 27 6 13 12K 8K 2 16 31 3 10 Feb 1964 19 3 11 18 16 17 22A 15A 24A 23A 13 6 8 26* 25* Mar 1964 28 2 31 19 18 27 1 29 10 3A 4 5 23 22 30 Apr 1964 22 23 24 12 14 13 10K 6K 9A 15A 28 1 2 27 19 May 1964 8 9 12 20 7 4 22 31 19 6 25 15 14 24 1 Jun 1964 5 30 3 16 6 17 2 4 19 1 10 11 20* 12* 21* Jul 1964 15 27 28 14 24 1 2 26 6 5 18 17 8 3* 7* Aug 1964 28 30 15 24 10 23 2 21 8 14 4 11 5* 12* 31* Sep 1964 14 20 19 13 15 12 26 11 21 18 28 22 7 8 30 Oct 1964 23 31 11 30 22 10 16 25 2 28 4 19 5 26* 21* Nov 1964 14 7 25 24 19 21 20 6 27 13 23 9* 1* 2* 15* Dec 1964 12 30 5 27 31 11 2 22 10 24 17* 16* 7* 19* 13* Jan 1965 24 6 25 11 16 26 1 31 5 4 22 8* 13* 12* 2* Feb 1965 2 17 19 12 13 18K 1 5 22 3K 7 21* 23* 6* 8* Mar 1965 18 8 10 30 11 9 19 31 16 6 3 23 25 4 26* Apr 1965 2 3 28 21 8 16 5 25 15 1 18 19* 9* 17* 20* May 1965 2 11 19 14 13 25 30 3 29 1 5 16* 9* 8* 10* Jun 1965 21 13 20 10 24 19 23 12 28 7 16 17 15* 30* 9* Jul 1965 11 17 31 5 4 26 16 21 14 30 8 6* 28* 10* 23* Aug 1965 13 6 28 5 10 1 22 29K 15K 27 19 18 20* 24* 25* Sep 1965 9 10 14 8 30 11 3K 22 20 21 16 28 17* 27 19* Oct 1965 4 6 15 21 16 1 17 20 3 10 23* 2* 8* 24* 28* Nov 1965 10 16 3 23 28 14 15 29 11 26 6* 20* 5* 30* 19* Dec 1965 16 15 17 14 6 21 5 3 31 23 26* 1* 28* 25* 18* Jan 1966 16 13 12 1 31 6 17 11 30 14 22 21 20* 23* 24* Feb 1966 28 14 26 9 1 2 18 27 21 7 23 24* 5* 20* 19* Mar 1966 2 7 1 24 31 8 18 6 5 9K 23 14 28 19 26 Apr 1966 27 19 11 25 26 16 18 12 17 28 1* 13* 22* 2* 30* May 1966 15 23 24 14 10 19 29 7 21 22 26 31 4* 2* 11* Jun 1966 10 22 18 9 27 11 17 8 6 14 25* 24* 23* 1* 2* Jul 1966 13 25 7 14 18 2 3 6 19 31 9 10 8 12* 21* Aug 1966 2 17 16 28 22 15 7 21 8 27 30 31 23 19 24* Sep 1966 18 13 12 22K 11A 17A 21A 14A 16A 24A 4 3 8 6 26 Oct 1966 11 21 22 2 23 10 29 20 3 19 5 31 16 4 6 Nov 1966 14 23 9 22 25 15 16 7K 24K 27 1 30 28* 3* 29* Dec 1966 12 11 9 31 3 7 19 8 10 18 14 27 26 13 5 Jan 1967 12 31 4 24 30 5 27 17 26 22 8 14 7 13 1* Feb 1967 10 2 12 3 13 28 14 1 20 24 16 8 7 25* 17* Mar 1967 11 12 15 8 25 16 31 24 2 26 19 18 27* 20* 9* Apr 1967 28 13 26 27 14 30 11 15 3K 12K 24 23 19 22* 1* May 1967 9 22 8 20 16 21K 6 18A 15K 10A 26 25 3 28 29 Jun 1967 1 24 20 23 18 21 12 19 22 16 6 5 26 25 27* Jul 1967 31 22 9 10 3 8 16 27 19 21 11 1* 5* 30* 23* Aug 1967 2 3 1 22 23 28 21 13 6 15 11 17* 18* 25* 10* Sep 1967 11 23 5 10 12 6 27 26 17 3 21 29 20 28 30 Oct 1967 21 26 25 20 24 19 4 16 2 22K 10 28 29 9* 12* Nov 1967 17 20 18 7 19 1 10 6 21K 23A 12 3 24 8* 13* Dec 1967 25 11 14 13 28 24 12 29K 10K 26A 31 1 19 20 8 Jan 1968 9 25 10 8 4A 7A 31A 3A 21A 22A 2 1 29* 6* 20* Feb 1968 6 25 26 7K 14 23 24A 5A 27A 1A 11 10 20 28 15 Mar 1968 9 8 7 13 22 6A 21A 12A 11A 23A 15 16 30 14 24 Apr 1968 20 19 9 8 21 10 25K 30A 24A 18A 6 1 5 26 14 May 1968 6 5 26 27 4 25 28K 8A 29A 15A 7 12 21 9 20* Jun 1968 24 21 25 6 5 28K 23 20A 15A 9A 11 13 10 12 14 Jul 1968 24 9 29 20 31 17 8 12A 15 6 10 14 13 22* 3* Aug 1968 29 30 1 28 2 26 21 25K 22 27 16 17 14 15 24* Sep 1968 25 27 18 24 26 11 17 10 30A 20A 8 13 15 14 23 Oct 1968 22 21 11 23 5 4 15 16 26 28K 31 12 2 29 13 Nov 1968 30 15 12 14 29 24 22 13 19 23K 1 2 3 4 9 Dec 1968 14 26 20 17 7 28 9 13 2 15 5 4 25 3* 23* Jan 1969 6 3 13 29 10 5 4 22 2 9 25 17 26 18 15* Feb 1969 18 1 9 17 22 24 25A 19A 21A 20A 11 3 2 27 15* Mar 1969 3 10 27 28 4K 14A 13A 2A 9A 1A 24 17 12 23 25 Apr 1969 23 19K 26 21K 10 11A 8A 20A 25A 24A 28 30 1 17 13 May 1969 27 26 11 29 8 7 25A 12A 6A 20A 15 14 13 16 2 Jun 1969 22 28 29 6 18 30 3 1 23 5 14 16* 12* 17* 13* Jul 1969 29 5 4 19 3 20 24 18 25 17 27 26 1* 14* 13* Aug 1969 1 29 11 25 30 16 31 15 2 6 27 12 3* 19* 26* Sep 1969 2 13 22 1 26 4 3 21 12 24 30 29 28 6 18* Oct 1969 30 14 8 15 26 29 23 20 16 13K 2 10 1 3* 6* Nov 1969 15 21 1 14 6 16 17 18 20 23 9 10 27 30* 3* Dec 1969 20 30 31 21 13 18 14 2 19 28 6* 5* 16* 9* 23*