# 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 1957   18  14  20   5  13     4  17   6  28A 12A   21  22  30  10  23 
 Feb 1957   28  26   7  10K 27K    1A  9A  8A 14A 16A   24  13   5  21   4 
 Mar 1957   14  12A 11A  7A 13A   19A 24A 15A 26A 20A    2  29  10  28  27 
 Apr 1957    7  14  22  25A 13A   23A  8A 12A 30A 29A   19  10  17  18   5 
 May 1957   16  15  29  12  24K   14  18  22  28  17A   26  30   9   1* 20*
 Jun 1957   11  10   9   1   2    29  16  12A 14A  8A   30  26  25   4   3 
 Jul 1957   13  26  10  15  11    30  14  21   9  28K    1   5   2   3  19 
 Aug 1957   24  23  17  22  11    16   1  25A 18A 14A   30  13  31   6   3 
 Sep 1957   27  19  11  20   8A   12A 10A 26A 28A  7A   23  13   3  29   4 
 Oct 1957    6   8  16   7  18    17A  9A 31A 26A 25A   14  21  13   1  11*
 Nov 1957    5   4  21  22  17K   23A  2A  1A 19A 30A   26  27  25   9  28 
 Dec 1957   23  28  22  29K 27    24A 14A  4A  8A 18A   31  11  12   6   1