# 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 1981   19  21  18  12  20    14K 13   9K  7  25A   31  11* 29* 28*  4*
 Feb 1981   14  10  21  18  17    19  22K 13A  4A 20A    6  26  25   5   2 
 Mar 1981    9  23  24  22  11A    3A 21A 10A 20A 19A    5  14  25   1  13 
 Apr 1981    5  30A 10A  9A 15A    7A  2A  6A  8A  4A   13  12  26  20  19 
 May 1981    5   4   7   6   3    27  29  22  30   2A   16  11  18  15  20 
 Jun 1981   12  14  10   9  23     4  13  22K  5  11     7  29  16   3*  8*
 Jul 1981   15  10  29  21   9    14A 28A  8A 16A  3A   25  26  23  17  27 
 Aug 1981    8   9A 26A 16A 14A   20A 12A  7A 13A 19A   23  24  17  27  18 
 Sep 1981   23  17   1   7  28K   21A 16A  6A 24A 20A   19  26  27  11   2*
 Oct 1981   31   6  18K  5A 16A    1A 26A 27A 12A 29A   22  14  20  11   3 
 Nov 1981   30  27  29   9   2    13K 28K  4K  1A  3A   17  12  11  25  14 
 Dec 1981   22   7  16   6  21    27  14  11  26  15K   29  30  12  31*  8*