# 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 1933   10   5  11  21  12     4  13   9  18   3    27  28  15* 26* 23*
 Feb 1933   17  11  16  13   1     6  18  12   8   3    21  22  24  19  23 
 Mar 1933    5   7  16   9   6    17   8  15   4   2    20  24  18  23  19 
 Apr 1933   12  13  11  29  14     5  27K  2A 25A 28A   17  19  21  18  20 
 May 1933   26   9  12  24  11    20  10  23   8  21     1  31   6  18*  2 
 Jun 1933    6  24  16   5  11    23  18   4  22   7    13   1  20* 14* 28*
 Jul 1933   15   7  16  30  13    21  29  14  31  28    24  23*  9* 27* 18*
 Aug 1933    1  11   3  31   9     4  12  28  10   2     5   6  13  21* 18*
 Sep 1933    5   6   3   7  24     4  30  26K  1  22K    9  15  13  14  10 
 Oct 1933    1   3  29  31  30    23  21  28  22  19K    7   5  14  18*  9*
 Nov 1933   26  17  24  25  14    30  15  16  13  29     8   6   7  11*  4*
 Dec 1933   30  24  31  23  12    14  15   1  21  16     5   4  10*  9*  3*