# 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 02 09 00.0 01.50 34373.00000 34373.06250 2.333 9 0 2026 02 09 03.0 04.50 34373.12500 34373.18750 1.333 5 0 2026 02 09 06.0 07.50 34373.25000 34373.31250 1.333 5 0 2026 02 09 09.0 10.50 34373.37500 34373.43750 1.333 5 0 2026 02 09 12.0 13.50 34373.50000 34373.56250 2.000 7 0 2026 02 09 15.0 16.50 34373.62500 34373.68750 1.667 6 0 2026 02 09 18.0 19.50 34373.75000 34373.81250 0.667 3 0 2026 02 09 21.0 22.50 34373.87500 34373.93750 2.333 9 0 2026 02 10 00.0 01.50 34374.00000 34374.06250 1.333 5 0 2026 02 10 03.0 04.50 34374.12500 34374.18750 0.000 0 0 2026 02 10 06.0 07.50 34374.25000 34374.31250 0.667 3 0 2026 02 10 09.0 10.50 34374.37500 34374.43750 2.667 12 0 2026 02 10 12.0 13.50 34374.50000 34374.56250 2.000 7 0 2026 02 10 15.0 16.50 34374.62500 34374.68750 1.333 5 0 2026 02 10 18.0 19.50 34374.75000 34374.81250 2.667 12 0 2026 02 10 21.0 22.50 34374.87500 34374.93750 4.333 32 0 2026 02 11 00.0 01.50 34375.00000 34375.06250 4.000 27 0 2026 02 11 03.0 04.50 34375.12500 34375.18750 3.000 15 0 2026 02 11 06.0 07.50 34375.25000 34375.31250 2.667 12 0 2026 02 11 09.0 10.50 34375.37500 34375.43750 3.000 15 0 2026 02 11 12.0 13.50 34375.50000 34375.56250 2.333 9 0 2026 02 11 15.0 16.50 34375.62500 34375.68750 3.333 18 0 2026 02 11 18.0 19.50 34375.75000 34375.81250 3.333 18 0 2026 02 11 21.0 22.50 34375.87500 34375.93750 3.667 22 0 2026 02 12 00.0 01.50 34376.00000 34376.06250 2.333 9 0 2026 02 12 03.0 04.50 34376.12500 34376.18750 2.333 9 0 2026 02 12 06.0 07.50 34376.25000 34376.31250 2.000 7 0 2026 02 12 09.0 10.50 34376.37500 34376.43750 2.333 9 0 2026 02 12 12.0 13.50 34376.50000 34376.56250 1.000 4 0 2026 02 12 15.0 16.50 34376.62500 34376.68750 2.333 9 0 2026 02 12 18.0 19.50 34376.75000 34376.81250 1.000 4 0 2026 02 12 21.0 22.50 34376.87500 34376.93750 2.000 7 0 2026 02 13 00.0 01.50 34377.00000 34377.06250 4.000 27 0 2026 02 13 03.0 04.50 34377.12500 34377.18750 2.333 9 0 2026 02 13 06.0 07.50 34377.25000 34377.31250 2.000 7 0 2026 02 13 09.0 10.50 34377.37500 34377.43750 2.333 9 0 2026 02 13 12.0 13.50 34377.50000 34377.56250 1.667 6 0 2026 02 13 15.0 16.50 34377.62500 34377.68750 2.667 12 0 2026 02 13 18.0 19.50 34377.75000 34377.81250 2.333 9 0 2026 02 13 21.0 22.50 34377.87500 34377.93750 4.333 32 0 2026 02 14 00.0 01.50 34378.00000 34378.06250 3.000 15 0 2026 02 14 03.0 04.50 34378.12500 34378.18750 2.667 12 0 2026 02 14 06.0 07.50 34378.25000 34378.31250 0.333 2 0 2026 02 14 09.0 10.50 34378.37500 34378.43750 0.333 2 0 2026 02 14 12.0 13.50 34378.50000 34378.56250 0.333 2 0 2026 02 14 15.0 16.50 34378.62500 34378.68750 1.000 4 0 2026 02 14 18.0 19.50 34378.75000 34378.81250 3.000 15 0 2026 02 14 21.0 22.50 34378.87500 34378.93750 4.667 39 0 2026 02 15 00.0 01.50 34379.00000 34379.06250 5.333 56 0 2026 02 15 03.0 04.50 34379.12500 34379.18750 5.000 48 0 2026 02 15 06.0 07.50 34379.25000 34379.31250 3.333 18 0 2026 02 15 09.0 10.50 34379.37500 34379.43750 3.000 15 0 2026 02 15 12.0 13.50 34379.50000 34379.56250 2.667 12 0 2026 02 15 15.0 16.50 34379.62500 34379.68750 3.000 15 0 2026 02 15 18.0 19.50 34379.75000 34379.81250 3.000 15 0 2026 02 15 21.0 22.50 34379.87500 34379.93750 4.000 27 0 2026 02 16 00.0 01.50 34380.00000 34380.06250 4.333 32 0 2026 02 16 03.0 04.50 34380.12500 34380.18750 4.333 32 0 2026 02 16 06.0 07.50 34380.25000 34380.31250 4.333 32 0 2026 02 16 09.0 10.50 34380.37500 34380.43750 3.000 15 0 2026 02 16 12.0 13.50 34380.50000 34380.56250 1.667 6 0 2026 02 16 15.0 16.50 34380.62500 34380.68750 3.667 22 0 2026 02 16 18.0 19.50 34380.75000 34380.81250 5.667 67 0 2026 02 16 21.0 22.50 34380.87500 34380.93750 2.667 12 0 2026 02 17 00.0 01.50 34381.00000 34381.06250 2.000 7 0 2026 02 17 03.0 04.50 34381.12500 34381.18750 2.000 7 0 2026 02 17 06.0 07.50 34381.25000 34381.31250 2.333 9 0 2026 02 17 09.0 10.50 34381.37500 34381.43750 2.667 12 0 2026 02 17 12.0 13.50 34381.50000 34381.56250 2.333 9 0 2026 02 17 15.0 16.50 34381.62500 34381.68750 3.000 15 0 2026 02 17 18.0 19.50 34381.75000 34381.81250 2.000 7 0 2026 02 17 21.0 22.50 34381.87500 34381.93750 2.667 12 0 2026 02 18 00.0 01.50 34382.00000 34382.06250 2.000 7 0 2026 02 18 03.0 04.50 34382.12500 34382.18750 3.333 18 0 2026 02 18 06.0 07.50 34382.25000 34382.31250 2.000 7 0 2026 02 18 09.0 10.50 34382.37500 34382.43750 2.000 7 0 2026 02 18 12.0 13.50 34382.50000 34382.56250 2.333 9 0 2026 02 18 15.0 16.50 34382.62500 34382.68750 2.000 7 0 2026 02 18 18.0 19.50 34382.75000 34382.81250 1.667 6 0 2026 02 18 21.0 22.50 34382.87500 34382.93750 2.333 9 0 2026 02 19 00.0 01.50 34383.00000 34383.06250 3.000 15 0 2026 02 19 03.0 04.50 34383.12500 34383.18750 3.000 15 0 2026 02 19 06.0 07.50 34383.25000 34383.31250 3.000 15 0 2026 02 19 09.0 10.50 34383.37500 34383.43750 2.000 7 0 2026 02 19 12.0 13.50 34383.50000 34383.56250 3.000 15 0 2026 02 19 15.0 16.50 34383.62500 34383.68750 1.000 4 0 2026 02 19 18.0 19.50 34383.75000 34383.81250 0.667 3 0 2026 02 19 21.0 22.50 34383.87500 34383.93750 1.333 5 0 2026 02 20 00.0 01.50 34384.00000 34384.06250 1.000 4 0 2026 02 20 03.0 04.50 34384.12500 34384.18750 2.333 9 0 2026 02 20 06.0 07.50 34384.25000 34384.31250 2.000 7 0 2026 02 20 09.0 10.50 34384.37500 34384.43750 2.000 7 0 2026 02 20 12.0 13.50 34384.50000 34384.56250 2.333 9 0 2026 02 20 15.0 16.50 34384.62500 34384.68750 2.333 9 0 2026 02 20 18.0 19.50 34384.75000 34384.81250 2.667 12 0 2026 02 20 21.0 22.50 34384.87500 34384.93750 3.667 22 0 2026 02 21 00.0 01.50 34385.00000 34385.06250 4.000 27 0 2026 02 21 03.0 04.50 34385.12500 34385.18750 3.333 18 0 2026 02 21 06.0 07.50 34385.25000 34385.31250 2.667 12 0 2026 02 21 09.0 10.50 34385.37500 34385.43750 1.667 6 0 2026 02 21 12.0 13.50 34385.50000 34385.56250 1.000 4 0 2026 02 21 15.0 16.50 34385.62500 34385.68750 1.333 5 0 2026 02 21 18.0 19.50 34385.75000 34385.81250 2.667 12 0 2026 02 21 21.0 22.50 34385.87500 34385.93750 4.333 32 0 2026 02 22 00.0 01.50 34386.00000 34386.06250 4.000 27 0 2026 02 22 03.0 04.50 34386.12500 34386.18750 4.667 39 0 2026 02 22 06.0 07.50 34386.25000 34386.31250 5.000 48 0 2026 02 22 09.0 10.50 34386.37500 34386.43750 4.000 27 0 2026 02 22 12.0 13.50 34386.50000 34386.56250 4.333 32 0 2026 02 22 15.0 16.50 34386.62500 34386.68750 3.667 22 0 2026 02 22 18.0 19.50 34386.75000 34386.81250 4.000 27 0 2026 02 22 21.0 22.50 34386.87500 34386.93750 5.333 56 0 2026 02 23 00.0 01.50 34387.00000 34387.06250 3.333 18 0 2026 02 23 03.0 04.50 34387.12500 34387.18750 5.000 48 0 2026 02 23 06.0 07.50 34387.25000 34387.31250 3.000 15 0 2026 02 23 09.0 10.50 34387.37500 34387.43750 3.667 22 0 2026 02 23 12.0 13.50 34387.50000 34387.56250 3.333 18 0 2026 02 23 15.0 16.50 34387.62500 34387.68750 2.000 7 0 2026 02 23 18.0 19.50 34387.75000 34387.81250 4.333 32 0 2026 02 23 21.0 22.50 34387.87500 34387.93750 4.000 27 0 2026 02 24 00.0 01.50 34388.00000 34388.06250 2.333 9 0 2026 02 24 03.0 04.50 34388.12500 34388.18750 3.667 22 0 2026 02 24 06.0 07.50 34388.25000 34388.31250 3.000 15 0 2026 02 24 09.0 10.50 34388.37500 34388.43750 2.667 12 0 2026 02 24 12.0 13.50 34388.50000 34388.56250 3.333 18 0 2026 02 24 15.0 16.50 34388.62500 34388.68750 2.000 7 0 2026 02 24 18.0 19.50 34388.75000 34388.81250 3.333 18 0 2026 02 24 21.0 22.50 34388.87500 34388.93750 2.667 12 0 2026 02 25 00.0 01.50 34389.00000 34389.06250 3.667 22 0 2026 02 25 03.0 04.50 34389.12500 34389.18750 2.667 12 0 2026 02 25 06.0 07.50 34389.25000 34389.31250 2.333 9 0 2026 02 25 09.0 10.50 34389.37500 34389.43750 3.000 15 0 2026 02 25 12.0 13.50 34389.50000 34389.56250 3.000 15 0 2026 02 25 15.0 16.50 34389.62500 34389.68750 2.667 12 0 2026 02 25 18.0 19.50 34389.75000 34389.81250 2.333 9 0 2026 02 25 21.0 22.50 34389.87500 34389.93750 3.667 22 0 2026 02 26 00.0 01.50 34390.00000 34390.06250 3.667 22 0 2026 02 26 03.0 04.50 34390.12500 34390.18750 4.000 27 0 2026 02 26 06.0 07.50 34390.25000 34390.31250 3.667 22 0 2026 02 26 09.0 10.50 34390.37500 34390.43750 3.333 18 0 2026 02 26 12.0 13.50 34390.50000 34390.56250 2.667 12 0 2026 02 26 15.0 16.50 34390.62500 34390.68750 2.000 7 0 2026 02 26 18.0 19.50 34390.75000 34390.81250 3.333 18 0 2026 02 26 21.0 22.50 34390.87500 34390.93750 2.333 9 0 2026 02 27 00.0 01.50 34391.00000 34391.06250 3.000 15 0 2026 02 27 03.0 04.50 34391.12500 34391.18750 1.667 6 0 2026 02 27 06.0 07.50 34391.25000 34391.31250 1.667 6 0 2026 02 27 09.0 10.50 34391.37500 34391.43750 2.000 7 0 2026 02 27 12.0 13.50 34391.50000 34391.56250 2.333 9 0 2026 02 27 15.0 16.50 34391.62500 34391.68750 3.000 15 0 2026 02 27 18.0 19.50 34391.75000 34391.81250 1.333 5 0 2026 02 27 21.0 22.50 34391.87500 34391.93750 2.333 9 0 2026 02 28 00.0 01.50 34392.00000 34392.06250 2.000 7 0 2026 02 28 03.0 04.50 34392.12500 34392.18750 2.667 12 0 2026 02 28 06.0 07.50 34392.25000 34392.31250 1.333 5 0 2026 02 28 09.0 10.50 34392.37500 34392.43750 1.333 5 0 2026 02 28 12.0 13.50 34392.50000 34392.56250 2.000 7 0 2026 02 28 15.0 16.50 34392.62500 34392.68750 1.667 6 0 2026 02 28 18.0 19.50 34392.75000 34392.81250 2.000 7 0 2026 02 28 21.0 22.50 34392.87500 34392.93750 2.333 9 0 2026 03 01 00.0 01.50 34393.00000 34393.06250 2.667 12 0 2026 03 01 03.0 04.50 34393.12500 34393.18750 2.667 12 0 2026 03 01 06.0 07.50 34393.25000 34393.31250 2.333 9 0 2026 03 01 09.0 10.50 34393.37500 34393.43750 2.000 7 0 2026 03 01 12.0 13.50 34393.50000 34393.56250 1.333 5 0 2026 03 01 15.0 16.50 34393.62500 34393.68750 0.667 3 0 2026 03 01 18.0 19.50 34393.75000 34393.81250 1.667 6 0 2026 03 01 21.0 22.50 34393.87500 34393.93750 1.333 5 0 2026 03 02 00.0 01.50 34394.00000 34394.06250 1.333 5 0 2026 03 02 03.0 04.50 34394.12500 34394.18750 0.667 3 0 2026 03 02 06.0 07.50 34394.25000 34394.31250 1.000 4 0 2026 03 02 09.0 10.50 34394.37500 34394.43750 0.333 2 0 2026 03 02 12.0 13.50 34394.50000 34394.56250 1.667 6 0 2026 03 02 15.0 16.50 34394.62500 34394.68750 1.000 4 0 2026 03 02 18.0 19.50 34394.75000 34394.81250 0.667 3 0 2026 03 02 21.0 22.50 34394.87500 34394.93750 1.333 5 0 2026 03 03 00.0 01.50 34395.00000 34395.06250 0.667 3 0 2026 03 03 03.0 04.50 34395.12500 34395.18750 2.667 12 0 2026 03 03 06.0 07.50 34395.25000 34395.31250 2.000 7 0 2026 03 03 09.0 10.50 34395.37500 34395.43750 2.333 9 0 2026 03 03 12.0 13.50 34395.50000 34395.56250 2.000 7 0 2026 03 03 15.0 16.50 34395.62500 34395.68750 3.333 18 0 2026 03 03 18.0 19.50 34395.75000 34395.81250 3.333 18 0 2026 03 03 21.0 22.50 34395.87500 34395.93750 5.000 48 0 2026 03 04 00.0 01.50 34396.00000 34396.06250 2.333 9 0 2026 03 04 03.0 04.50 34396.12500 34396.18750 3.000 15 0 2026 03 04 06.0 07.50 34396.25000 34396.31250 1.667 6 0 2026 03 04 09.0 10.50 34396.37500 34396.43750 2.000 7 0 2026 03 04 12.0 13.50 34396.50000 34396.56250 0.667 3 0 2026 03 04 15.0 16.50 34396.62500 34396.68750 0.667 3 0 2026 03 04 18.0 19.50 34396.75000 34396.81250 1.333 5 0 2026 03 04 21.0 22.50 34396.87500 34396.93750 1.667 6 0 2026 03 05 00.0 01.50 34397.00000 34397.06250 1.667 6 0 2026 03 05 03.0 04.50 34397.12500 34397.18750 0.000 0 0 2026 03 05 06.0 07.50 34397.25000 34397.31250 1.333 5 0 2026 03 05 09.0 10.50 34397.37500 34397.43750 0.333 2 0 2026 03 05 12.0 13.50 34397.50000 34397.56250 1.000 4 0 2026 03 05 15.0 16.50 34397.62500 34397.68750 0.000 0 0 2026 03 05 18.0 19.50 34397.75000 34397.81250 0.000 0 0 2026 03 05 21.0 22.50 34397.87500 34397.93750 0.667 3 0 2026 03 06 00.0 01.50 34398.00000 34398.06250 1.000 4 0 2026 03 06 03.0 04.50 34398.12500 34398.18750 2.333 9 0 2026 03 06 06.0 07.50 34398.25000 34398.31250 2.000 7 0 2026 03 06 09.0 10.50 34398.37500 34398.43750 1.000 4 0 2026 03 06 12.0 13.50 34398.50000 34398.56250 1.667 6 0 2026 03 06 15.0 16.50 34398.62500 34398.68750 1.000 4 0 2026 03 06 18.0 19.50 34398.75000 34398.81250 1.000 4 0 2026 03 06 21.0 22.50 34398.87500 34398.93750 3.333 18 0 2026 03 07 00.0 01.50 34399.00000 34399.06250 4.000 27 0 2026 03 07 03.0 04.50 34399.12500 34399.18750 3.333 18 0 2026 03 07 06.0 07.50 34399.25000 34399.31250 3.000 15 0 2026 03 07 09.0 10.50 34399.37500 34399.43750 2.000 7 0 2026 03 07 12.0 13.50 34399.50000 34399.56250 1.667 6 0 2026 03 07 15.0 16.50 34399.62500 34399.68750 3.000 15 0 2026 03 07 18.0 19.50 34399.75000 34399.81250 4.000 27 0 2026 03 07 21.0 22.50 34399.87500 34399.93750 4.000 27 0 2026 03 08 00.0 01.50 34400.00000 34400.06250 4.667 39 0 2026 03 08 03.0 04.50 34400.12500 34400.18750 3.667 22 0 2026 03 08 06.0 07.50 34400.25000 34400.31250 4.000 27 0 2026 03 08 09.0 10.50 34400.37500 34400.43750 2.667 12 0 2026 03 08 12.0 13.50 34400.50000 34400.56250 3.667 22 0 2026 03 08 15.0 16.50 34400.62500 34400.68750 4.000 27 0 2026 03 08 18.0 19.50 34400.75000 34400.81250 3.000 15 0 2026 03 08 21.0 22.50 34400.87500 34400.93750 2.333 9 0 2026 03 09 00.0 01.50 34401.00000 34401.06250 2.000 7 0 2026 03 09 03.0 04.50 34401.12500 34401.18750 1.333 5 0 2026 03 09 06.0 07.50 34401.25000 34401.31250 1.000 4 0 2026 03 09 09.0 10.50 34401.37500 34401.43750 1.333 5 0 2026 03 09 12.0 13.50 34401.50000 34401.56250 1.667 6 0 2026 03 09 15.0 16.50 34401.62500 34401.68750 1.667 6 0 2026 03 09 18.0 19.50 34401.75000 34401.81250 1.667 6 0 2026 03 09 21.0 22.50 34401.87500 34401.93750 2.333 9 0 2026 03 10 00.0 01.50 34402.00000 34402.06250 3.333 18 0 2026 03 10 03.0 04.50 34402.12500 34402.18750 2.000 7 0 2026 03 10 06.0 07.50 34402.25000 34402.31250 -1.000 -1 0 2026 03 10 09.0 10.50 34402.37500 34402.43750 -1.000 -1 0 2026 03 10 12.0 13.50 34402.50000 34402.56250 -1.000 -1 0 2026 03 10 15.0 16.50 34402.62500 34402.68750 -1.000 -1 0 2026 03 10 18.0 19.50 34402.75000 34402.81250 -1.000 -1 0 2026 03 10 21.0 22.50 34402.87500 34402.93750 -1.000 -1 0