# 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 1958    4   3   8   7   5K    6A 28A 27A 30A 31A    1  21  18  17  23 
 Feb 1958   25   3K 26A 15A 24A    2A  1A 27A 16A 28A   11  12  18  17   6 
 Mar 1958    1K  2A 29A 28A 16A   27A 14A 10A 31A  9A   12  13  19   5  20 
 Apr 1958   10  13  12  22  11A   23A  9A  8A 27A 25A   17  18   4   2  16 
 May 1958   24  23  20  22   7    21K  3A  6A  4A 25A   31  29  26  14  13 
 Jun 1958   17   4   3  18A 20A   27A 26A  5A 19A 30A   29   7  21   1  28 
 Jul 1958   15   6  23   2  16A   29A 28A 26A  5A 30A    8   9  21  18  27 
 Aug 1958    4   6   8   5  20    21   9A 14A 31A 15A   24  17  27  22  18 
 Sep 1958   13  22  21  18  14    20  19   2  23  12     4  25   5   3  16 
 Oct 1958   12  10   9   4  11    20K 21K 14A 13A 18A   24  23  22  27  28 
 Nov 1958   30   5   6   8  22    14  21  20   9  19    11* 28*  2* 10*  3*
 Dec 1958    1  10  25   7  12    31A  3A 24A 21A 11A    4  18  13  17  19