# 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 1975    2  11  12  26K 25K   10K 29  21  30A 22A    8   7  14   4  13 
 Feb 1975   27  22A  8A 20A  6A   26A 21A  4A 19A  9A   10   1  11  12  23 
 Mar 1975    8   7  21  22K 25A    9A  4A 30A  2A 19A   10  11  28  12  27 
 Apr 1975   29  28  27  17  19     2  30  16  18K  3K    9  10  11   8  13 
 May 1975   11  15  12  31  28    24   1  30  13K 18A    5   6  16   7  20 
 Jun 1975   24  10  27   8  23    28  25  26   9  22     2  12  29  30   1 
 Jul 1975   29   5  30  31K 12    24  23K  6K 21  22     8  25   9  26* 11*
 Aug 1975   12  19   3  13  26    28   7  16  18  27K    5  29  15* 21* 14*
 Sep 1975   24   4  25  30   3    22   5  23  29  16    10  11   9  12* 13*
 Oct 1975    2  25  19  24  15    18  20  27K 26  22     8   9   7   6  10 
 Nov 1975   14  13  27  15K 16    18A  8A  1A 23A 19A    3  22   4   9   2 
 Dec 1975   12  13  24   7  20    11  19  14  18  31A   26  27   1   2   8*