# PURPOSE: This file distributes the Kp index and ap index (one line per three-hour interval) # LICENSE: CC BY 4.0 # SOURCE: Geomagnetic Observatory Niemegk, GFZ Helmholtz Centre for Geosciences # PLEASE CITE: 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 # # Kp, ap and Ap # The three-hourly equivalent planetary amplitude ap is derived from Kp and the daily equivalent planetary amplitude Ap is the daily mean of ap. # Kp is unitless. Ap and ap are unitless and can be multiplied by 2 nT to yield the average geomagnetic disturbance at 50 degree geomagnetic latitude. # Kp, ap and Ap were introduced by Bartels (1949, 1957) and are produced by Geomagnetic Observatory Niemegk, GFZ Helmholtz Centre for Geosciences. # Described in: Matzka et al. (2021), see reference above. # Data publication: 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 # # Short file description (for a detailed file description, see Kp_ap_Ap_SN_F107_format.txt): # 30 header lines, all starting with # # ASCII, blank separated and fixed length, missing data indicated by -1.000 for Kp and -1 for ap # YYYY MM DD is date of UT day, hh.h is starting time in hours of interval for which Kp and ap are given # hh._m is mid time in hours of interval for which Kp and ap are given # days is days since 1932-01-01 00:00 UT to start of interval, days_m is days since 1932-01-01 00:00 UT to mid of interval # Kp, ap # D indicates if the Kp and ap values are definitive (D = 1) or preliminary (D=0) # # # # # The format for each line is (i stands for integer, f for float): #iii ii ii ff.f ff.ff fffff.fffff fffff.fffff ff.fff iiii i # The parameters in each line are: #YYY MM DD hh.h hh._m days days_m Kp ap D 2026 09 18 00.0 01.50 34594.00000 34594.06250 1.000 4 1 2026 09 18 03.0 04.50 34594.12500 34594.18750 1.667 6 1 2026 09 18 06.0 07.50 34594.25000 34594.31250 1.667 6 1 2026 09 18 09.0 10.50 34594.37500 34594.43750 1.333 5 1 2026 09 18 12.0 13.50 34594.50000 34594.56250 0.667 3 1 2026 09 18 15.0 16.50 34594.62500 34594.68750 0.667 3 1 2026 09 18 18.0 19.50 34594.75000 34594.81250 1.000 4 1 2026 09 18 21.0 22.50 34594.87500 34594.93750 1.333 5 1 2026 09 19 00.0 01.50 34595.00000 34595.06250 2.000 7 1 2026 09 19 03.0 04.50 34595.12500 34595.18750 2.667 12 1 2026 09 19 06.0 07.50 34595.25000 34595.31250 1.333 5 1 2026 09 19 09.0 10.50 34595.37500 34595.43750 1.000 4 1 2026 09 19 12.0 13.50 34595.50000 34595.56250 1.000 4 1 2026 09 19 15.0 16.50 34595.62500 34595.68750 1.333 5 1 2026 09 19 18.0 19.50 34595.75000 34595.81250 1.333 5 1 2026 09 19 21.0 22.50 34595.87500 34595.93750 1.667 6 1 2026 09 20 00.0 01.50 34596.00000 34596.06250 2.000 7 1 2026 09 20 03.0 04.50 34596.12500 34596.18750 2.667 12 1 2026 09 20 06.0 07.50 34596.25000 34596.31250 1.667 6 1 2026 09 20 09.0 10.50 34596.37500 34596.43750 0.333 2 1 2026 09 20 12.0 13.50 34596.50000 34596.56250 0.333 2 1 2026 09 20 15.0 16.50 34596.62500 34596.68750 0.333 2 1 2026 09 20 18.0 19.50 34596.75000 34596.81250 0.333 2 1 2026 09 20 21.0 22.50 34596.87500 34596.93750 1.000 4 1 2026 09 21 00.0 01.50 34597.00000 34597.06250 1.333 5 1 2026 09 21 03.0 04.50 34597.12500 34597.18750 0.667 3 1 2026 09 21 06.0 07.50 34597.25000 34597.31250 0.000 0 1 2026 09 21 09.0 10.50 34597.37500 34597.43750 0.000 0 1 2026 09 21 12.0 13.50 34597.50000 34597.56250 0.000 0 1 2026 09 21 15.0 16.50 34597.62500 34597.68750 0.000 0 1 2026 09 21 18.0 19.50 34597.75000 34597.81250 0.333 2 1 2026 09 21 21.0 22.50 34597.87500 34597.93750 1.000 4 1 2026 09 22 00.0 01.50 34598.00000 34598.06250 1.667 6 1 2026 09 22 03.0 04.50 34598.12500 34598.18750 0.333 2 1 2026 09 22 06.0 07.50 34598.25000 34598.31250 0.000 0 1 2026 09 22 09.0 10.50 34598.37500 34598.43750 0.000 0 1 2026 09 22 12.0 13.50 34598.50000 34598.56250 0.000 0 1 2026 09 22 15.0 16.50 34598.62500 34598.68750 0.667 3 1 2026 09 22 18.0 19.50 34598.75000 34598.81250 0.667 3 1 2026 09 22 21.0 22.50 34598.87500 34598.93750 0.667 3 1 2026 09 23 00.0 01.50 34599.00000 34599.06250 0.333 2 1 2026 09 23 03.0 04.50 34599.12500 34599.18750 0.000 0 1 2026 09 23 06.0 07.50 34599.25000 34599.31250 0.000 0 1 2026 09 23 09.0 10.50 34599.37500 34599.43750 0.333 2 1 2026 09 23 12.0 13.50 34599.50000 34599.56250 0.000 0 1 2026 09 23 15.0 16.50 34599.62500 34599.68750 0.333 2 1 2026 09 23 18.0 19.50 34599.75000 34599.81250 1.333 5 1 2026 09 23 21.0 22.50 34599.87500 34599.93750 1.667 6 1 2026 09 24 00.0 01.50 34600.00000 34600.06250 2.667 12 1 2026 09 24 03.0 04.50 34600.12500 34600.18750 2.000 7 1 2026 09 24 06.0 07.50 34600.25000 34600.31250 2.667 12 1 2026 09 24 09.0 10.50 34600.37500 34600.43750 4.000 27 1 2026 09 24 12.0 13.50 34600.50000 34600.56250 3.333 18 1 2026 09 24 15.0 16.50 34600.62500 34600.68750 3.333 18 1 2026 09 24 18.0 19.50 34600.75000 34600.81250 2.000 7 1 2026 09 24 21.0 22.50 34600.87500 34600.93750 2.667 12 1 2026 09 25 00.0 01.50 34601.00000 34601.06250 3.667 22 1 2026 09 25 03.0 04.50 34601.12500 34601.18750 3.333 18 1 2026 09 25 06.0 07.50 34601.25000 34601.31250 3.667 22 1 2026 09 25 09.0 10.50 34601.37500 34601.43750 4.000 27 1 2026 09 25 12.0 13.50 34601.50000 34601.56250 3.333 18 1 2026 09 25 15.0 16.50 34601.62500 34601.68750 2.667 12 1 2026 09 25 18.0 19.50 34601.75000 34601.81250 3.000 15 1 2026 09 25 21.0 22.50 34601.87500 34601.93750 4.000 27 1 2026 09 26 00.0 01.50 34602.00000 34602.06250 3.333 18 1 2026 09 26 03.0 04.50 34602.12500 34602.18750 3.333 18 1 2026 09 26 06.0 07.50 34602.25000 34602.31250 2.333 9 1 2026 09 26 09.0 10.50 34602.37500 34602.43750 2.667 12 1 2026 09 26 12.0 13.50 34602.50000 34602.56250 1.333 5 1 2026 09 26 15.0 16.50 34602.62500 34602.68750 1.000 4 1 2026 09 26 18.0 19.50 34602.75000 34602.81250 2.000 7 1 2026 09 26 21.0 22.50 34602.87500 34602.93750 2.333 9 1 2026 09 27 00.0 01.50 34603.00000 34603.06250 4.000 27 1 2026 09 27 03.0 04.50 34603.12500 34603.18750 2.667 12 1 2026 09 27 06.0 07.50 34603.25000 34603.31250 1.333 5 1 2026 09 27 09.0 10.50 34603.37500 34603.43750 1.000 4 1 2026 09 27 12.0 13.50 34603.50000 34603.56250 1.000 4 1 2026 09 27 15.0 16.50 34603.62500 34603.68750 0.667 3 1 2026 09 27 18.0 19.50 34603.75000 34603.81250 0.667 3 1 2026 09 27 21.0 22.50 34603.87500 34603.93750 0.000 0 1 2026 09 28 00.0 01.50 34604.00000 34604.06250 0.000 0 1 2026 09 28 03.0 04.50 34604.12500 34604.18750 1.333 5 1 2026 09 28 06.0 07.50 34604.25000 34604.31250 0.333 2 1 2026 09 28 09.0 10.50 34604.37500 34604.43750 0.667 3 1 2026 09 28 12.0 13.50 34604.50000 34604.56250 0.667 3 1 2026 09 28 15.0 16.50 34604.62500 34604.68750 0.667 3 1 2026 09 28 18.0 19.50 34604.75000 34604.81250 1.000 4 1 2026 09 28 21.0 22.50 34604.87500 34604.93750 0.333 2 1 2026 09 29 00.0 01.50 34605.00000 34605.06250 1.667 6 1 2026 09 29 03.0 04.50 34605.12500 34605.18750 0.000 0 1 2026 09 29 06.0 07.50 34605.25000 34605.31250 0.333 2 1 2026 09 29 09.0 10.50 34605.37500 34605.43750 1.000 4 1 2026 09 29 12.0 13.50 34605.50000 34605.56250 0.333 2 1 2026 09 29 15.0 16.50 34605.62500 34605.68750 0.667 3 1 2026 09 29 18.0 19.50 34605.75000 34605.81250 0.333 2 1 2026 09 29 21.0 22.50 34605.87500 34605.93750 0.667 3 1 2026 09 30 00.0 01.50 34606.00000 34606.06250 0.667 3 1 2026 09 30 03.0 04.50 34606.12500 34606.18750 0.333 2 1 2026 09 30 06.0 07.50 34606.25000 34606.31250 0.000 0 1 2026 09 30 09.0 10.50 34606.37500 34606.43750 0.667 3 1 2026 09 30 12.0 13.50 34606.50000 34606.56250 0.667 3 1 2026 09 30 15.0 16.50 34606.62500 34606.68750 0.333 2 1 2026 09 30 18.0 19.50 34606.75000 34606.81250 0.333 2 1 2026 09 30 21.0 22.50 34606.87500 34606.93750 0.333 2 1 2026 10 01 00.0 01.50 34607.00000 34607.06250 0.000 0 0 2026 10 01 03.0 04.50 34607.12500 34607.18750 0.333 2 0 2026 10 01 06.0 07.50 34607.25000 34607.31250 0.333 2 0 2026 10 01 09.0 10.50 34607.37500 34607.43750 0.333 2 0 2026 10 01 12.0 13.50 34607.50000 34607.56250 0.667 3 0 2026 10 01 15.0 16.50 34607.62500 34607.68750 1.333 5 0 2026 10 01 18.0 19.50 34607.75000 34607.81250 1.333 5 0 2026 10 01 21.0 22.50 34607.87500 34607.93750 1.667 6 0 2026 10 02 00.0 01.50 34608.00000 34608.06250 0.667 3 0 2026 10 02 03.0 04.50 34608.12500 34608.18750 0.667 3 0 2026 10 02 06.0 07.50 34608.25000 34608.31250 0.000 0 0 2026 10 02 09.0 10.50 34608.37500 34608.43750 0.333 2 0 2026 10 02 12.0 13.50 34608.50000 34608.56250 0.333 2 0 2026 10 02 15.0 16.50 34608.62500 34608.68750 0.000 0 0 2026 10 02 18.0 19.50 34608.75000 34608.81250 0.667 3 0 2026 10 02 21.0 22.50 34608.87500 34608.93750 1.667 6 0 2026 10 03 00.0 01.50 34609.00000 34609.06250 1.333 5 0 2026 10 03 03.0 04.50 34609.12500 34609.18750 2.667 12 0 2026 10 03 06.0 07.50 34609.25000 34609.31250 2.000 7 0 2026 10 03 09.0 10.50 34609.37500 34609.43750 1.667 6 0 2026 10 03 12.0 13.50 34609.50000 34609.56250 1.333 5 0 2026 10 03 15.0 16.50 34609.62500 34609.68750 0.333 2 0 2026 10 03 18.0 19.50 34609.75000 34609.81250 0.333 2 0 2026 10 03 21.0 22.50 34609.87500 34609.93750 1.000 4 0 2026 10 04 00.0 01.50 34610.00000 34610.06250 3.000 15 0 2026 10 04 03.0 04.50 34610.12500 34610.18750 3.333 18 0 2026 10 04 06.0 07.50 34610.25000 34610.31250 4.333 32 0 2026 10 04 09.0 10.50 34610.37500 34610.43750 5.000 48 0 2026 10 04 12.0 13.50 34610.50000 34610.56250 4.667 39 0 2026 10 04 15.0 16.50 34610.62500 34610.68750 4.667 39 0 2026 10 04 18.0 19.50 34610.75000 34610.81250 5.667 67 0 2026 10 04 21.0 22.50 34610.87500 34610.93750 5.000 48 0 2026 10 05 00.0 01.50 34611.00000 34611.06250 4.000 27 0 2026 10 05 03.0 04.50 34611.12500 34611.18750 5.000 48 0 2026 10 05 06.0 07.50 34611.25000 34611.31250 2.000 7 0 2026 10 05 09.0 10.50 34611.37500 34611.43750 3.333 18 0 2026 10 05 12.0 13.50 34611.50000 34611.56250 2.667 12 0 2026 10 05 15.0 16.50 34611.62500 34611.68750 4.000 27 0 2026 10 05 18.0 19.50 34611.75000 34611.81250 3.667 22 0 2026 10 05 21.0 22.50 34611.87500 34611.93750 3.667 22 0 2026 10 06 00.0 01.50 34612.00000 34612.06250 3.000 15 0 2026 10 06 03.0 04.50 34612.12500 34612.18750 3.000 15 0 2026 10 06 06.0 07.50 34612.25000 34612.31250 2.333 9 0 2026 10 06 09.0 10.50 34612.37500 34612.43750 2.333 9 0 2026 10 06 12.0 13.50 34612.50000 34612.56250 2.333 9 0 2026 10 06 15.0 16.50 34612.62500 34612.68750 1.333 5 0 2026 10 06 18.0 19.50 34612.75000 34612.81250 2.333 9 0 2026 10 06 21.0 22.50 34612.87500 34612.93750 2.667 12 0 2026 10 07 00.0 01.50 34613.00000 34613.06250 1.000 4 0 2026 10 07 03.0 04.50 34613.12500 34613.18750 0.333 2 0 2026 10 07 06.0 07.50 34613.25000 34613.31250 1.000 4 0 2026 10 07 09.0 10.50 34613.37500 34613.43750 0.333 2 0 2026 10 07 12.0 13.50 34613.50000 34613.56250 0.667 3 0 2026 10 07 15.0 16.50 34613.62500 34613.68750 2.667 12 0 2026 10 07 18.0 19.50 34613.75000 34613.81250 2.667 12 0 2026 10 07 21.0 22.50 34613.87500 34613.93750 1.000 4 0 2026 10 08 00.0 01.50 34614.00000 34614.06250 1.000 4 0 2026 10 08 03.0 04.50 34614.12500 34614.18750 1.000 4 0 2026 10 08 06.0 07.50 34614.25000 34614.31250 1.000 4 0 2026 10 08 09.0 10.50 34614.37500 34614.43750 2.000 7 0 2026 10 08 12.0 13.50 34614.50000 34614.56250 1.333 5 0 2026 10 08 15.0 16.50 34614.62500 34614.68750 1.333 5 0 2026 10 08 18.0 19.50 34614.75000 34614.81250 2.333 9 0 2026 10 08 21.0 22.50 34614.87500 34614.93750 1.000 4 0 2026 10 09 00.0 01.50 34615.00000 34615.06250 3.000 15 0 2026 10 09 03.0 04.50 34615.12500 34615.18750 3.000 15 0 2026 10 09 06.0 07.50 34615.25000 34615.31250 2.000 7 0 2026 10 09 09.0 10.50 34615.37500 34615.43750 3.667 22 0 2026 10 09 12.0 13.50 34615.50000 34615.56250 1.667 6 0 2026 10 09 15.0 16.50 34615.62500 34615.68750 0.667 3 0 2026 10 09 18.0 19.50 34615.75000 34615.81250 1.000 4 0 2026 10 09 21.0 22.50 34615.87500 34615.93750 2.667 12 0 2026 10 10 00.0 01.50 34616.00000 34616.06250 2.000 7 0 2026 10 10 03.0 04.50 34616.12500 34616.18750 3.333 18 0 2026 10 10 06.0 07.50 34616.25000 34616.31250 2.667 12 0 2026 10 10 09.0 10.50 34616.37500 34616.43750 2.000 7 0 2026 10 10 12.0 13.50 34616.50000 34616.56250 3.667 22 0 2026 10 10 15.0 16.50 34616.62500 34616.68750 7.333 154 0 2026 10 10 18.0 19.50 34616.75000 34616.81250 7.000 132 0 2026 10 10 21.0 22.50 34616.87500 34616.93750 5.667 67 0 2026 10 11 00.0 01.50 34617.00000 34617.06250 4.000 27 0 2026 10 11 03.0 04.50 34617.12500 34617.18750 3.667 22 0 2026 10 11 06.0 07.50 34617.25000 34617.31250 2.667 12 0 2026 10 11 09.0 10.50 34617.37500 34617.43750 3.000 15 0 2026 10 11 12.0 13.50 34617.50000 34617.56250 2.333 9 0 2026 10 11 15.0 16.50 34617.62500 34617.68750 2.333 9 0 2026 10 11 18.0 19.50 34617.75000 34617.81250 1.667 6 0 2026 10 11 21.0 22.50 34617.87500 34617.93750 2.000 7 0 2026 10 12 00.0 01.50 34618.00000 34618.06250 1.667 6 0 2026 10 12 03.0 04.50 34618.12500 34618.18750 2.000 7 0 2026 10 12 06.0 07.50 34618.25000 34618.31250 3.000 15 0 2026 10 12 09.0 10.50 34618.37500 34618.43750 1.000 4 0 2026 10 12 12.0 13.50 34618.50000 34618.56250 0.333 2 0 2026 10 12 15.0 16.50 34618.62500 34618.68750 1.000 4 0 2026 10 12 18.0 19.50 34618.75000 34618.81250 2.000 7 0 2026 10 12 21.0 22.50 34618.87500 34618.93750 1.000 4 0 2026 10 13 00.0 01.50 34619.00000 34619.06250 3.333 18 0 2026 10 13 03.0 04.50 34619.12500 34619.18750 3.333 18 0 2026 10 13 06.0 07.50 34619.25000 34619.31250 2.000 7 0 2026 10 13 09.0 10.50 34619.37500 34619.43750 3.000 15 0 2026 10 13 12.0 13.50 34619.50000 34619.56250 3.000 15 0 2026 10 13 15.0 16.50 34619.62500 34619.68750 2.000 7 0 2026 10 13 18.0 19.50 34619.75000 34619.81250 2.667 12 0 2026 10 13 21.0 22.50 34619.87500 34619.93750 1.000 4 0 2026 10 14 00.0 01.50 34620.00000 34620.06250 2.333 9 0 2026 10 14 03.0 04.50 34620.12500 34620.18750 3.333 18 0 2026 10 14 06.0 07.50 34620.25000 34620.31250 1.333 5 0 2026 10 14 09.0 10.50 34620.37500 34620.43750 2.000 7 0 2026 10 14 12.0 13.50 34620.50000 34620.56250 1.667 6 0 2026 10 14 15.0 16.50 34620.62500 34620.68750 2.000 7 0 2026 10 14 18.0 19.50 34620.75000 34620.81250 2.667 12 0 2026 10 14 21.0 22.50 34620.87500 34620.93750 2.667 12 0 2026 10 15 00.0 01.50 34621.00000 34621.06250 2.000 7 0 2026 10 15 03.0 04.50 34621.12500 34621.18750 1.000 4 0 2026 10 15 06.0 07.50 34621.25000 34621.31250 0.667 3 0 2026 10 15 09.0 10.50 34621.37500 34621.43750 3.333 18 0 2026 10 15 12.0 13.50 34621.50000 34621.56250 2.333 9 0 2026 10 15 15.0 16.50 34621.62500 34621.68750 3.000 15 0 2026 10 15 18.0 19.50 34621.75000 34621.81250 2.667 12 0 2026 10 15 21.0 22.50 34621.87500 34621.93750 2.333 9 0 2026 10 16 00.0 01.50 34622.00000 34622.06250 3.000 15 0 2026 10 16 03.0 04.50 34622.12500 34622.18750 1.000 4 0 2026 10 16 06.0 07.50 34622.25000 34622.31250 1.333 5 0 2026 10 16 09.0 10.50 34622.37500 34622.43750 2.333 9 0 2026 10 16 12.0 13.50 34622.50000 34622.56250 1.667 6 0 2026 10 16 15.0 16.50 34622.62500 34622.68750 3.333 18 0 2026 10 16 18.0 19.50 34622.75000 34622.81250 4.000 27 0 2026 10 16 21.0 22.50 34622.87500 34622.93750 2.000 7 0 2026 10 17 00.0 01.50 34623.00000 34623.06250 1.667 6 0 2026 10 17 03.0 04.50 34623.12500 34623.18750 0.333 2 0 2026 10 17 06.0 07.50 34623.25000 34623.31250 -1.000 -1 0 2026 10 17 09.0 10.50 34623.37500 34623.43750 -1.000 -1 0 2026 10 17 12.0 13.50 34623.50000 34623.56250 -1.000 -1 0 2026 10 17 15.0 16.50 34623.62500 34623.68750 -1.000 -1 0 2026 10 17 18.0 19.50 34623.75000 34623.81250 -1.000 -1 0 2026 10 17 21.0 22.50 34623.87500 34623.93750 -1.000 -1 0