# 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 07 20 00.0 01.50 34534.00000 34534.06250 0.667 3 0 2026 07 20 03.0 04.50 34534.12500 34534.18750 0.333 2 0 2026 07 20 06.0 07.50 34534.25000 34534.31250 1.000 4 0 2026 07 20 09.0 10.50 34534.37500 34534.43750 0.667 3 0 2026 07 20 12.0 13.50 34534.50000 34534.56250 0.667 3 0 2026 07 20 15.0 16.50 34534.62500 34534.68750 0.333 2 0 2026 07 20 18.0 19.50 34534.75000 34534.81250 0.667 3 0 2026 07 20 21.0 22.50 34534.87500 34534.93750 1.000 4 0 2026 07 21 00.0 01.50 34535.00000 34535.06250 2.000 7 0 2026 07 21 03.0 04.50 34535.12500 34535.18750 2.667 12 0 2026 07 21 06.0 07.50 34535.25000 34535.31250 3.000 15 0 2026 07 21 09.0 10.50 34535.37500 34535.43750 3.667 22 0 2026 07 21 12.0 13.50 34535.50000 34535.56250 2.667 12 0 2026 07 21 15.0 16.50 34535.62500 34535.68750 2.667 12 0 2026 07 21 18.0 19.50 34535.75000 34535.81250 3.000 15 0 2026 07 21 21.0 22.50 34535.87500 34535.93750 3.000 15 0 2026 07 22 00.0 01.50 34536.00000 34536.06250 1.667 6 0 2026 07 22 03.0 04.50 34536.12500 34536.18750 2.667 12 0 2026 07 22 06.0 07.50 34536.25000 34536.31250 2.000 7 0 2026 07 22 09.0 10.50 34536.37500 34536.43750 3.000 15 0 2026 07 22 12.0 13.50 34536.50000 34536.56250 3.000 15 0 2026 07 22 15.0 16.50 34536.62500 34536.68750 2.333 9 0 2026 07 22 18.0 19.50 34536.75000 34536.81250 1.667 6 0 2026 07 22 21.0 22.50 34536.87500 34536.93750 2.333 9 0 2026 07 23 00.0 01.50 34537.00000 34537.06250 2.000 7 0 2026 07 23 03.0 04.50 34537.12500 34537.18750 1.667 6 0 2026 07 23 06.0 07.50 34537.25000 34537.31250 2.667 12 0 2026 07 23 09.0 10.50 34537.37500 34537.43750 2.667 12 0 2026 07 23 12.0 13.50 34537.50000 34537.56250 3.000 15 0 2026 07 23 15.0 16.50 34537.62500 34537.68750 5.333 56 0 2026 07 23 18.0 19.50 34537.75000 34537.81250 5.667 67 0 2026 07 23 21.0 22.50 34537.87500 34537.93750 3.333 18 0 2026 07 24 00.0 01.50 34538.00000 34538.06250 4.000 27 0 2026 07 24 03.0 04.50 34538.12500 34538.18750 2.667 12 0 2026 07 24 06.0 07.50 34538.25000 34538.31250 1.667 6 0 2026 07 24 09.0 10.50 34538.37500 34538.43750 0.667 3 0 2026 07 24 12.0 13.50 34538.50000 34538.56250 0.333 2 0 2026 07 24 15.0 16.50 34538.62500 34538.68750 0.333 2 0 2026 07 24 18.0 19.50 34538.75000 34538.81250 0.667 3 0 2026 07 24 21.0 22.50 34538.87500 34538.93750 1.000 4 0 2026 07 25 00.0 01.50 34539.00000 34539.06250 0.667 3 0 2026 07 25 03.0 04.50 34539.12500 34539.18750 0.667 3 0 2026 07 25 06.0 07.50 34539.25000 34539.31250 0.667 3 0 2026 07 25 09.0 10.50 34539.37500 34539.43750 1.667 6 0 2026 07 25 12.0 13.50 34539.50000 34539.56250 1.333 5 0 2026 07 25 15.0 16.50 34539.62500 34539.68750 2.000 7 0 2026 07 25 18.0 19.50 34539.75000 34539.81250 2.667 12 0 2026 07 25 21.0 22.50 34539.87500 34539.93750 1.333 5 0 2026 07 26 00.0 01.50 34540.00000 34540.06250 1.333 5 0 2026 07 26 03.0 04.50 34540.12500 34540.18750 1.667 6 0 2026 07 26 06.0 07.50 34540.25000 34540.31250 1.333 5 0 2026 07 26 09.0 10.50 34540.37500 34540.43750 1.667 6 0 2026 07 26 12.0 13.50 34540.50000 34540.56250 1.000 4 0 2026 07 26 15.0 16.50 34540.62500 34540.68750 0.333 2 0 2026 07 26 18.0 19.50 34540.75000 34540.81250 0.000 0 0 2026 07 26 21.0 22.50 34540.87500 34540.93750 1.000 4 0 2026 07 27 00.0 01.50 34541.00000 34541.06250 1.333 5 0 2026 07 27 03.0 04.50 34541.12500 34541.18750 0.667 3 0 2026 07 27 06.0 07.50 34541.25000 34541.31250 1.333 5 0 2026 07 27 09.0 10.50 34541.37500 34541.43750 0.667 3 0 2026 07 27 12.0 13.50 34541.50000 34541.56250 0.667 3 0 2026 07 27 15.0 16.50 34541.62500 34541.68750 1.667 6 0 2026 07 27 18.0 19.50 34541.75000 34541.81250 1.667 6 0 2026 07 27 21.0 22.50 34541.87500 34541.93750 2.667 12 0 2026 07 28 00.0 01.50 34542.00000 34542.06250 2.333 9 0 2026 07 28 03.0 04.50 34542.12500 34542.18750 1.000 4 0 2026 07 28 06.0 07.50 34542.25000 34542.31250 1.333 5 0 2026 07 28 09.0 10.50 34542.37500 34542.43750 2.000 7 0 2026 07 28 12.0 13.50 34542.50000 34542.56250 2.000 7 0 2026 07 28 15.0 16.50 34542.62500 34542.68750 1.667 6 0 2026 07 28 18.0 19.50 34542.75000 34542.81250 1.667 6 0 2026 07 28 21.0 22.50 34542.87500 34542.93750 2.333 9 0 2026 07 29 00.0 01.50 34543.00000 34543.06250 2.333 9 0 2026 07 29 03.0 04.50 34543.12500 34543.18750 2.000 7 0 2026 07 29 06.0 07.50 34543.25000 34543.31250 1.000 4 0 2026 07 29 09.0 10.50 34543.37500 34543.43750 0.667 3 0 2026 07 29 12.0 13.50 34543.50000 34543.56250 0.667 3 0 2026 07 29 15.0 16.50 34543.62500 34543.68750 0.667 3 0 2026 07 29 18.0 19.50 34543.75000 34543.81250 0.667 3 0 2026 07 29 21.0 22.50 34543.87500 34543.93750 0.667 3 0 2026 07 30 00.0 01.50 34544.00000 34544.06250 1.000 4 0 2026 07 30 03.0 04.50 34544.12500 34544.18750 0.667 3 0 2026 07 30 06.0 07.50 34544.25000 34544.31250 0.333 2 0 2026 07 30 09.0 10.50 34544.37500 34544.43750 1.333 5 0 2026 07 30 12.0 13.50 34544.50000 34544.56250 0.667 3 0 2026 07 30 15.0 16.50 34544.62500 34544.68750 1.000 4 0 2026 07 30 18.0 19.50 34544.75000 34544.81250 0.667 3 0 2026 07 30 21.0 22.50 34544.87500 34544.93750 0.667 3 0 2026 07 31 00.0 01.50 34545.00000 34545.06250 1.333 5 0 2026 07 31 03.0 04.50 34545.12500 34545.18750 0.667 3 0 2026 07 31 06.0 07.50 34545.25000 34545.31250 0.667 3 0 2026 07 31 09.0 10.50 34545.37500 34545.43750 0.667 3 0 2026 07 31 12.0 13.50 34545.50000 34545.56250 1.667 6 0 2026 07 31 15.0 16.50 34545.62500 34545.68750 1.000 4 0 2026 07 31 18.0 19.50 34545.75000 34545.81250 0.667 3 0 2026 07 31 21.0 22.50 34545.87500 34545.93750 1.000 4 0 2026 08 01 00.0 01.50 34546.00000 34546.06250 0.667 3 0 2026 08 01 03.0 04.50 34546.12500 34546.18750 0.667 3 0 2026 08 01 06.0 07.50 34546.25000 34546.31250 0.667 3 0 2026 08 01 09.0 10.50 34546.37500 34546.43750 0.667 3 0 2026 08 01 12.0 13.50 34546.50000 34546.56250 0.667 3 0 2026 08 01 15.0 16.50 34546.62500 34546.68750 0.333 2 0 2026 08 01 18.0 19.50 34546.75000 34546.81250 0.000 0 0 2026 08 01 21.0 22.50 34546.87500 34546.93750 1.000 4 0 2026 08 02 00.0 01.50 34547.00000 34547.06250 0.333 2 0 2026 08 02 03.0 04.50 34547.12500 34547.18750 0.667 3 0 2026 08 02 06.0 07.50 34547.25000 34547.31250 1.333 5 0 2026 08 02 09.0 10.50 34547.37500 34547.43750 1.000 4 0 2026 08 02 12.0 13.50 34547.50000 34547.56250 4.000 27 0 2026 08 02 15.0 16.50 34547.62500 34547.68750 5.667 67 0 2026 08 02 18.0 19.50 34547.75000 34547.81250 3.667 22 0 2026 08 02 21.0 22.50 34547.87500 34547.93750 1.667 6 0 2026 08 03 00.0 01.50 34548.00000 34548.06250 4.333 32 0 2026 08 03 03.0 04.50 34548.12500 34548.18750 4.333 32 0 2026 08 03 06.0 07.50 34548.25000 34548.31250 2.667 12 0 2026 08 03 09.0 10.50 34548.37500 34548.43750 3.000 15 0 2026 08 03 12.0 13.50 34548.50000 34548.56250 3.333 18 0 2026 08 03 15.0 16.50 34548.62500 34548.68750 1.667 6 0 2026 08 03 18.0 19.50 34548.75000 34548.81250 3.000 15 0 2026 08 03 21.0 22.50 34548.87500 34548.93750 3.667 22 0 2026 08 04 00.0 01.50 34549.00000 34549.06250 4.333 32 0 2026 08 04 03.0 04.50 34549.12500 34549.18750 2.333 9 0 2026 08 04 06.0 07.50 34549.25000 34549.31250 2.333 9 0 2026 08 04 09.0 10.50 34549.37500 34549.43750 2.000 7 0 2026 08 04 12.0 13.50 34549.50000 34549.56250 0.667 3 0 2026 08 04 15.0 16.50 34549.62500 34549.68750 0.667 3 0 2026 08 04 18.0 19.50 34549.75000 34549.81250 0.667 3 0 2026 08 04 21.0 22.50 34549.87500 34549.93750 1.000 4 0 2026 08 05 00.0 01.50 34550.00000 34550.06250 0.333 2 0 2026 08 05 03.0 04.50 34550.12500 34550.18750 0.333 2 0 2026 08 05 06.0 07.50 34550.25000 34550.31250 1.000 4 0 2026 08 05 09.0 10.50 34550.37500 34550.43750 0.000 0 0 2026 08 05 12.0 13.50 34550.50000 34550.56250 0.000 0 0 2026 08 05 15.0 16.50 34550.62500 34550.68750 0.000 0 0 2026 08 05 18.0 19.50 34550.75000 34550.81250 0.333 2 0 2026 08 05 21.0 22.50 34550.87500 34550.93750 1.667 6 0 2026 08 06 00.0 01.50 34551.00000 34551.06250 1.333 5 0 2026 08 06 03.0 04.50 34551.12500 34551.18750 0.667 3 0 2026 08 06 06.0 07.50 34551.25000 34551.31250 0.000 0 0 2026 08 06 09.0 10.50 34551.37500 34551.43750 0.000 0 0 2026 08 06 12.0 13.50 34551.50000 34551.56250 0.000 0 0 2026 08 06 15.0 16.50 34551.62500 34551.68750 0.000 0 0 2026 08 06 18.0 19.50 34551.75000 34551.81250 0.333 2 0 2026 08 06 21.0 22.50 34551.87500 34551.93750 0.000 0 0 2026 08 07 00.0 01.50 34552.00000 34552.06250 0.000 0 0 2026 08 07 03.0 04.50 34552.12500 34552.18750 0.333 2 0 2026 08 07 06.0 07.50 34552.25000 34552.31250 1.000 4 0 2026 08 07 09.0 10.50 34552.37500 34552.43750 0.667 3 0 2026 08 07 12.0 13.50 34552.50000 34552.56250 1.333 5 0 2026 08 07 15.0 16.50 34552.62500 34552.68750 0.333 2 0 2026 08 07 18.0 19.50 34552.75000 34552.81250 0.000 0 0 2026 08 07 21.0 22.50 34552.87500 34552.93750 0.333 2 0 2026 08 08 00.0 01.50 34553.00000 34553.06250 0.667 3 0 2026 08 08 03.0 04.50 34553.12500 34553.18750 1.667 6 0 2026 08 08 06.0 07.50 34553.25000 34553.31250 2.000 7 0 2026 08 08 09.0 10.50 34553.37500 34553.43750 4.000 27 0 2026 08 08 12.0 13.50 34553.50000 34553.56250 5.667 67 0 2026 08 08 15.0 16.50 34553.62500 34553.68750 3.333 18 0 2026 08 08 18.0 19.50 34553.75000 34553.81250 5.667 67 0 2026 08 08 21.0 22.50 34553.87500 34553.93750 4.000 27 0 2026 08 09 00.0 01.50 34554.00000 34554.06250 2.667 12 0 2026 08 09 03.0 04.50 34554.12500 34554.18750 2.000 7 0 2026 08 09 06.0 07.50 34554.25000 34554.31250 1.667 6 0 2026 08 09 09.0 10.50 34554.37500 34554.43750 1.333 5 0 2026 08 09 12.0 13.50 34554.50000 34554.56250 1.000 4 0 2026 08 09 15.0 16.50 34554.62500 34554.68750 1.000 4 0 2026 08 09 18.0 19.50 34554.75000 34554.81250 1.667 6 0 2026 08 09 21.0 22.50 34554.87500 34554.93750 2.000 7 0 2026 08 10 00.0 01.50 34555.00000 34555.06250 2.000 7 0 2026 08 10 03.0 04.50 34555.12500 34555.18750 0.667 3 0 2026 08 10 06.0 07.50 34555.25000 34555.31250 1.333 5 0 2026 08 10 09.0 10.50 34555.37500 34555.43750 1.333 5 0 2026 08 10 12.0 13.50 34555.50000 34555.56250 0.333 2 0 2026 08 10 15.0 16.50 34555.62500 34555.68750 0.000 0 0 2026 08 10 18.0 19.50 34555.75000 34555.81250 0.000 0 0 2026 08 10 21.0 22.50 34555.87500 34555.93750 1.333 5 0 2026 08 11 00.0 01.50 34556.00000 34556.06250 0.667 3 0 2026 08 11 03.0 04.50 34556.12500 34556.18750 0.333 2 0 2026 08 11 06.0 07.50 34556.25000 34556.31250 0.000 0 0 2026 08 11 09.0 10.50 34556.37500 34556.43750 1.667 6 0 2026 08 11 12.0 13.50 34556.50000 34556.56250 2.667 12 0 2026 08 11 15.0 16.50 34556.62500 34556.68750 3.000 15 0 2026 08 11 18.0 19.50 34556.75000 34556.81250 1.667 6 0 2026 08 11 21.0 22.50 34556.87500 34556.93750 1.000 4 0 2026 08 12 00.0 01.50 34557.00000 34557.06250 1.667 6 0 2026 08 12 03.0 04.50 34557.12500 34557.18750 2.667 12 0 2026 08 12 06.0 07.50 34557.25000 34557.31250 2.000 7 0 2026 08 12 09.0 10.50 34557.37500 34557.43750 1.667 6 0 2026 08 12 12.0 13.50 34557.50000 34557.56250 2.333 9 0 2026 08 12 15.0 16.50 34557.62500 34557.68750 1.333 5 0 2026 08 12 18.0 19.50 34557.75000 34557.81250 2.333 9 0 2026 08 12 21.0 22.50 34557.87500 34557.93750 1.000 4 0 2026 08 13 00.0 01.50 34558.00000 34558.06250 2.333 9 0 2026 08 13 03.0 04.50 34558.12500 34558.18750 2.333 9 0 2026 08 13 06.0 07.50 34558.25000 34558.31250 1.333 5 0 2026 08 13 09.0 10.50 34558.37500 34558.43750 1.000 4 0 2026 08 13 12.0 13.50 34558.50000 34558.56250 0.667 3 0 2026 08 13 15.0 16.50 34558.62500 34558.68750 0.667 3 0 2026 08 13 18.0 19.50 34558.75000 34558.81250 1.333 5 0 2026 08 13 21.0 22.50 34558.87500 34558.93750 3.000 15 0 2026 08 14 00.0 01.50 34559.00000 34559.06250 2.667 12 0 2026 08 14 03.0 04.50 34559.12500 34559.18750 2.333 9 0 2026 08 14 06.0 07.50 34559.25000 34559.31250 2.667 12 0 2026 08 14 09.0 10.50 34559.37500 34559.43750 2.333 9 0 2026 08 14 12.0 13.50 34559.50000 34559.56250 2.000 7 0 2026 08 14 15.0 16.50 34559.62500 34559.68750 1.333 5 0 2026 08 14 18.0 19.50 34559.75000 34559.81250 2.333 9 0 2026 08 14 21.0 22.50 34559.87500 34559.93750 1.333 5 0 2026 08 15 00.0 01.50 34560.00000 34560.06250 0.667 3 0 2026 08 15 03.0 04.50 34560.12500 34560.18750 1.333 5 0 2026 08 15 06.0 07.50 34560.25000 34560.31250 0.333 2 0 2026 08 15 09.0 10.50 34560.37500 34560.43750 0.667 3 0 2026 08 15 12.0 13.50 34560.50000 34560.56250 1.333 5 0 2026 08 15 15.0 16.50 34560.62500 34560.68750 1.667 6 0 2026 08 15 18.0 19.50 34560.75000 34560.81250 2.667 12 0 2026 08 15 21.0 22.50 34560.87500 34560.93750 1.333 5 0 2026 08 16 00.0 01.50 34561.00000 34561.06250 1.333 5 0 2026 08 16 03.0 04.50 34561.12500 34561.18750 1.667 6 0 2026 08 16 06.0 07.50 34561.25000 34561.31250 2.000 7 0 2026 08 16 09.0 10.50 34561.37500 34561.43750 0.667 3 0 2026 08 16 12.0 13.50 34561.50000 34561.56250 0.333 2 0 2026 08 16 15.0 16.50 34561.62500 34561.68750 0.000 0 0 2026 08 16 18.0 19.50 34561.75000 34561.81250 0.333 2 0 2026 08 16 21.0 22.50 34561.87500 34561.93750 0.667 3 0 2026 08 17 00.0 01.50 34562.00000 34562.06250 1.000 4 0 2026 08 17 03.0 04.50 34562.12500 34562.18750 1.667 6 0 2026 08 17 06.0 07.50 34562.25000 34562.31250 2.333 9 0 2026 08 17 09.0 10.50 34562.37500 34562.43750 1.000 4 0 2026 08 17 12.0 13.50 34562.50000 34562.56250 2.667 12 0 2026 08 17 15.0 16.50 34562.62500 34562.68750 3.000 15 0 2026 08 17 18.0 19.50 34562.75000 34562.81250 3.667 22 0 2026 08 17 21.0 22.50 34562.87500 34562.93750 3.667 22 0 2026 08 18 00.0 01.50 34563.00000 34563.06250 4.000 27 0 2026 08 18 03.0 04.50 34563.12500 34563.18750 4.667 39 0 2026 08 18 06.0 07.50 34563.25000 34563.31250 3.333 18 0 2026 08 18 09.0 10.50 34563.37500 34563.43750 -1.000 -1 0 2026 08 18 12.0 13.50 34563.50000 34563.56250 -1.000 -1 0 2026 08 18 15.0 16.50 34563.62500 34563.68750 -1.000 -1 0 2026 08 18 18.0 19.50 34563.75000 34563.81250 -1.000 -1 0 2026 08 18 21.0 22.50 34563.87500 34563.93750 -1.000 -1 0