# 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 1938   11  10  30A 14A  1A   15A  3A  5A 28A  9A   22  17  25  26  21 
 Feb 1938   19  22  15  20  21K   17  16  18A 24A  5A    6  14   8   9  10 
 Mar 1938   20  19  18  31  10    16  30  28   9  13    23  22  24   5  26 
 Apr 1938    5  28   2  29  30    27   1  20  21A 26A   16  14  23  13   6 
 May 1938   23  20  26   1   7K   19   8   9K 21  31    12  11   4  14  29 
 Jun 1938   23  15  28  14  20    24  25  19  27  26    12   8  13   2* 11*
 Jul 1938   28  26  25  27  18     3  24  12  22   7    15  30  16   4  10 
 Aug 1938   16  15  20  18  19    27  14   9  26  17     4  11   5  23   2 
 Sep 1938   24  19   6  25   2     1  18  20   4A 21A   15  28  14  27  26 
 Oct 1938    5  14  31  13  12    15  18  30K 22  17K    7   8   1  25  27 
 Nov 1938   12  13  11  30   5     3   2   4   7   1K    9   8  17  21  26*
 Dec 1938    8   1  26  27  31    29  25  24   7  30    18  17  10   3  22