# 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 1940   28  21  26  14  27    23  15A 22A 20A 13A    3  18  31  12  10 
 Feb 1940   18  19  17  14  28    10A 27A 15A 16A  4A    1  25  20   2* 21*
 Mar 1940   18  15  17  11   6     5   4   7   2  10    30  25  24  31  29 
 Apr 1940   10   9   7   8  12    18  11  19  23A 17A    3  25   1  26   2 
 May 1940    6  31  30   8   4     2   3   5  16K  7    24  18  22  26  27 
 Jun 1940    4  20   1  13  11    21  12  29K  3K 28K   25   6  14   7  26 
 Jul 1940   18  27   2  17  20    19  12  26   8K 28    13  10   4  14  30*
 Aug 1940   24  15  17  16  30    25  23  21  13A 14A    9   3  26*  6* 11*
 Sep 1940   23  17  19  10  18    12  11  13  24  22A   27  28   7  26   3 
 Oct 1940   23  24  14  13  17    30  10A 31A 29K  5A    7   8   1  26   3*
 Nov 1940   10  11   8  24  28K   18   2K 19A  6A 20A   13  29  22  25  26 
 Dec 1940    8   7  19   6  18K   17A  5A 11A 24A 10A   20  30  21   2  31