# 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 1991    7   6  14  19  22    30  29  21  20  28    24  12* 31* 25* 15*
 Feb 1991   18  17  16   3   6     4K 24  20  19A 26A    1  23  28*  9* 11*
 Mar 1991   29  11  15   3  14A   16A 18A  4A 31A  2A   24  25  26  27  30 
 Apr 1991   20  11  13  16   8    15  14  21  10A 23A   29   4   3  30  28 
 May 1991   11  18  20  12  19     6   5   7  21A 15A   31   2  25  14  17 
 Jun 1991   16  29  14A 28A 27A   15A 20A  3A 22A 30A    5  13  10  11   1 
 Jul 1991    5  26  31  28K 29    24   7A 27A  6A 30A   13   9  14   8  17 
 Aug 1991   10A 13A 26A 25A 24A    8A 23A 29A  9A  7A   19  20  12   2  31 
 Sep 1991   23  21  17  18K 24A   16A 22A 20A 12A 15A   25   1   9  27  28 
 Oct 1991   16  15  12  17K 13A   14A 18A 19A 11A  9A   29  28  31   2   1 
 Nov 1991   27A 26A 28A 25A 12A    7A 13A 30A 24A 29A    9   1   8  21  19 
 Dec 1991    6   7  22K 15A 25A    8A 26A  5A 31A  9A   17  27  29  21  28