# 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 05 18 00.0 01.50 34471.00000 34471.06250 2.333 9 1 2026 05 18 03.0 04.50 34471.12500 34471.18750 1.667 6 1 2026 05 18 06.0 07.50 34471.25000 34471.31250 2.000 7 1 2026 05 18 09.0 10.50 34471.37500 34471.43750 1.667 6 1 2026 05 18 12.0 13.50 34471.50000 34471.56250 2.667 12 1 2026 05 18 15.0 16.50 34471.62500 34471.68750 2.333 9 1 2026 05 18 18.0 19.50 34471.75000 34471.81250 2.000 7 1 2026 05 18 21.0 22.50 34471.87500 34471.93750 2.667 12 1 2026 05 19 00.0 01.50 34472.00000 34472.06250 1.667 6 1 2026 05 19 03.0 04.50 34472.12500 34472.18750 2.667 12 1 2026 05 19 06.0 07.50 34472.25000 34472.31250 3.333 18 1 2026 05 19 09.0 10.50 34472.37500 34472.43750 3.333 18 1 2026 05 19 12.0 13.50 34472.50000 34472.56250 4.000 27 1 2026 05 19 15.0 16.50 34472.62500 34472.68750 3.667 22 1 2026 05 19 18.0 19.50 34472.75000 34472.81250 2.667 12 1 2026 05 19 21.0 22.50 34472.87500 34472.93750 2.667 12 1 2026 05 20 00.0 01.50 34473.00000 34473.06250 3.000 15 1 2026 05 20 03.0 04.50 34473.12500 34473.18750 2.667 12 1 2026 05 20 06.0 07.50 34473.25000 34473.31250 1.333 5 1 2026 05 20 09.0 10.50 34473.37500 34473.43750 0.667 3 1 2026 05 20 12.0 13.50 34473.50000 34473.56250 1.333 5 1 2026 05 20 15.0 16.50 34473.62500 34473.68750 1.000 4 1 2026 05 20 18.0 19.50 34473.75000 34473.81250 1.333 5 1 2026 05 20 21.0 22.50 34473.87500 34473.93750 2.000 7 1 2026 05 21 00.0 01.50 34474.00000 34474.06250 2.667 12 1 2026 05 21 03.0 04.50 34474.12500 34474.18750 2.000 7 1 2026 05 21 06.0 07.50 34474.25000 34474.31250 1.000 4 1 2026 05 21 09.0 10.50 34474.37500 34474.43750 1.333 5 1 2026 05 21 12.0 13.50 34474.50000 34474.56250 2.000 7 1 2026 05 21 15.0 16.50 34474.62500 34474.68750 1.000 4 1 2026 05 21 18.0 19.50 34474.75000 34474.81250 2.000 7 1 2026 05 21 21.0 22.50 34474.87500 34474.93750 1.333 5 1 2026 05 22 00.0 01.50 34475.00000 34475.06250 1.000 4 1 2026 05 22 03.0 04.50 34475.12500 34475.18750 1.000 4 1 2026 05 22 06.0 07.50 34475.25000 34475.31250 1.333 5 1 2026 05 22 09.0 10.50 34475.37500 34475.43750 1.333 5 1 2026 05 22 12.0 13.50 34475.50000 34475.56250 0.333 2 1 2026 05 22 15.0 16.50 34475.62500 34475.68750 1.000 4 1 2026 05 22 18.0 19.50 34475.75000 34475.81250 0.667 3 1 2026 05 22 21.0 22.50 34475.87500 34475.93750 2.333 9 1 2026 05 23 00.0 01.50 34476.00000 34476.06250 0.333 2 1 2026 05 23 03.0 04.50 34476.12500 34476.18750 0.333 2 1 2026 05 23 06.0 07.50 34476.25000 34476.31250 1.000 4 1 2026 05 23 09.0 10.50 34476.37500 34476.43750 0.333 2 1 2026 05 23 12.0 13.50 34476.50000 34476.56250 0.333 2 1 2026 05 23 15.0 16.50 34476.62500 34476.68750 0.000 0 1 2026 05 23 18.0 19.50 34476.75000 34476.81250 0.000 0 1 2026 05 23 21.0 22.50 34476.87500 34476.93750 0.000 0 1 2026 05 24 00.0 01.50 34477.00000 34477.06250 0.333 2 1 2026 05 24 03.0 04.50 34477.12500 34477.18750 0.667 3 1 2026 05 24 06.0 07.50 34477.25000 34477.31250 0.667 3 1 2026 05 24 09.0 10.50 34477.37500 34477.43750 1.000 4 1 2026 05 24 12.0 13.50 34477.50000 34477.56250 1.667 6 1 2026 05 24 15.0 16.50 34477.62500 34477.68750 1.333 5 1 2026 05 24 18.0 19.50 34477.75000 34477.81250 2.333 9 1 2026 05 24 21.0 22.50 34477.87500 34477.93750 1.667 6 1 2026 05 25 00.0 01.50 34478.00000 34478.06250 2.667 12 1 2026 05 25 03.0 04.50 34478.12500 34478.18750 1.667 6 1 2026 05 25 06.0 07.50 34478.25000 34478.31250 1.000 4 1 2026 05 25 09.0 10.50 34478.37500 34478.43750 1.667 6 1 2026 05 25 12.0 13.50 34478.50000 34478.56250 1.667 6 1 2026 05 25 15.0 16.50 34478.62500 34478.68750 2.000 7 1 2026 05 25 18.0 19.50 34478.75000 34478.81250 2.333 9 1 2026 05 25 21.0 22.50 34478.87500 34478.93750 2.667 12 1 2026 05 26 00.0 01.50 34479.00000 34479.06250 2.000 7 1 2026 05 26 03.0 04.50 34479.12500 34479.18750 0.333 2 1 2026 05 26 06.0 07.50 34479.25000 34479.31250 1.000 4 1 2026 05 26 09.0 10.50 34479.37500 34479.43750 1.000 4 1 2026 05 26 12.0 13.50 34479.50000 34479.56250 0.667 3 1 2026 05 26 15.0 16.50 34479.62500 34479.68750 1.000 4 1 2026 05 26 18.0 19.50 34479.75000 34479.81250 2.667 12 1 2026 05 26 21.0 22.50 34479.87500 34479.93750 3.667 22 1 2026 05 27 00.0 01.50 34480.00000 34480.06250 2.000 7 1 2026 05 27 03.0 04.50 34480.12500 34480.18750 2.000 7 1 2026 05 27 06.0 07.50 34480.25000 34480.31250 2.333 9 1 2026 05 27 09.0 10.50 34480.37500 34480.43750 1.333 5 1 2026 05 27 12.0 13.50 34480.50000 34480.56250 1.667 6 1 2026 05 27 15.0 16.50 34480.62500 34480.68750 2.667 12 1 2026 05 27 18.0 19.50 34480.75000 34480.81250 2.667 12 1 2026 05 27 21.0 22.50 34480.87500 34480.93750 3.000 15 1 2026 05 28 00.0 01.50 34481.00000 34481.06250 1.667 6 1 2026 05 28 03.0 04.50 34481.12500 34481.18750 2.000 7 1 2026 05 28 06.0 07.50 34481.25000 34481.31250 2.333 9 1 2026 05 28 09.0 10.50 34481.37500 34481.43750 2.333 9 1 2026 05 28 12.0 13.50 34481.50000 34481.56250 2.333 9 1 2026 05 28 15.0 16.50 34481.62500 34481.68750 3.333 18 1 2026 05 28 18.0 19.50 34481.75000 34481.81250 3.000 15 1 2026 05 28 21.0 22.50 34481.87500 34481.93750 3.667 22 1 2026 05 29 00.0 01.50 34482.00000 34482.06250 2.667 12 1 2026 05 29 03.0 04.50 34482.12500 34482.18750 2.333 9 1 2026 05 29 06.0 07.50 34482.25000 34482.31250 2.000 7 1 2026 05 29 09.0 10.50 34482.37500 34482.43750 1.667 6 1 2026 05 29 12.0 13.50 34482.50000 34482.56250 3.000 15 1 2026 05 29 15.0 16.50 34482.62500 34482.68750 3.333 18 1 2026 05 29 18.0 19.50 34482.75000 34482.81250 4.000 27 1 2026 05 29 21.0 22.50 34482.87500 34482.93750 3.333 18 1 2026 05 30 00.0 01.50 34483.00000 34483.06250 3.000 15 1 2026 05 30 03.0 04.50 34483.12500 34483.18750 2.667 12 1 2026 05 30 06.0 07.50 34483.25000 34483.31250 1.000 4 1 2026 05 30 09.0 10.50 34483.37500 34483.43750 1.333 5 1 2026 05 30 12.0 13.50 34483.50000 34483.56250 2.000 7 1 2026 05 30 15.0 16.50 34483.62500 34483.68750 2.333 9 1 2026 05 30 18.0 19.50 34483.75000 34483.81250 4.000 27 1 2026 05 30 21.0 22.50 34483.87500 34483.93750 3.667 22 1 2026 05 31 00.0 01.50 34484.00000 34484.06250 3.333 18 1 2026 05 31 03.0 04.50 34484.12500 34484.18750 2.333 9 1 2026 05 31 06.0 07.50 34484.25000 34484.31250 2.000 7 1 2026 05 31 09.0 10.50 34484.37500 34484.43750 1.333 5 1 2026 05 31 12.0 13.50 34484.50000 34484.56250 2.667 12 1 2026 05 31 15.0 16.50 34484.62500 34484.68750 2.000 7 1 2026 05 31 18.0 19.50 34484.75000 34484.81250 1.667 6 1 2026 05 31 21.0 22.50 34484.87500 34484.93750 2.333 9 1 2026 06 01 00.0 01.50 34485.00000 34485.06250 1.333 5 0 2026 06 01 03.0 04.50 34485.12500 34485.18750 1.000 4 0 2026 06 01 06.0 07.50 34485.25000 34485.31250 1.333 5 0 2026 06 01 09.0 10.50 34485.37500 34485.43750 1.333 5 0 2026 06 01 12.0 13.50 34485.50000 34485.56250 2.667 12 0 2026 06 01 15.0 16.50 34485.62500 34485.68750 3.000 15 0 2026 06 01 18.0 19.50 34485.75000 34485.81250 2.333 9 0 2026 06 01 21.0 22.50 34485.87500 34485.93750 1.333 5 0 2026 06 02 00.0 01.50 34486.00000 34486.06250 2.333 9 0 2026 06 02 03.0 04.50 34486.12500 34486.18750 1.667 6 0 2026 06 02 06.0 07.50 34486.25000 34486.31250 1.333 5 0 2026 06 02 09.0 10.50 34486.37500 34486.43750 1.000 4 0 2026 06 02 12.0 13.50 34486.50000 34486.56250 1.333 5 0 2026 06 02 15.0 16.50 34486.62500 34486.68750 1.000 4 0 2026 06 02 18.0 19.50 34486.75000 34486.81250 2.333 9 0 2026 06 02 21.0 22.50 34486.87500 34486.93750 1.667 6 0 2026 06 03 00.0 01.50 34487.00000 34487.06250 2.667 12 0 2026 06 03 03.0 04.50 34487.12500 34487.18750 2.333 9 0 2026 06 03 06.0 07.50 34487.25000 34487.31250 1.667 6 0 2026 06 03 09.0 10.50 34487.37500 34487.43750 2.000 7 0 2026 06 03 12.0 13.50 34487.50000 34487.56250 1.333 5 0 2026 06 03 15.0 16.50 34487.62500 34487.68750 2.000 7 0 2026 06 03 18.0 19.50 34487.75000 34487.81250 2.333 9 0 2026 06 03 21.0 22.50 34487.87500 34487.93750 3.000 15 0 2026 06 04 00.0 01.50 34488.00000 34488.06250 2.667 12 0 2026 06 04 03.0 04.50 34488.12500 34488.18750 2.333 9 0 2026 06 04 06.0 07.50 34488.25000 34488.31250 0.333 2 0 2026 06 04 09.0 10.50 34488.37500 34488.43750 0.333 2 0 2026 06 04 12.0 13.50 34488.50000 34488.56250 1.667 6 0 2026 06 04 15.0 16.50 34488.62500 34488.68750 1.000 4 0 2026 06 04 18.0 19.50 34488.75000 34488.81250 0.333 2 0 2026 06 04 21.0 22.50 34488.87500 34488.93750 1.000 4 0 2026 06 05 00.0 01.50 34489.00000 34489.06250 1.000 4 0 2026 06 05 03.0 04.50 34489.12500 34489.18750 3.000 15 0 2026 06 05 06.0 07.50 34489.25000 34489.31250 1.667 6 0 2026 06 05 09.0 10.50 34489.37500 34489.43750 2.667 12 0 2026 06 05 12.0 13.50 34489.50000 34489.56250 5.333 56 0 2026 06 05 15.0 16.50 34489.62500 34489.68750 6.333 94 0 2026 06 05 18.0 19.50 34489.75000 34489.81250 5.000 48 0 2026 06 05 21.0 22.50 34489.87500 34489.93750 5.000 48 0 2026 06 06 00.0 01.50 34490.00000 34490.06250 4.667 39 0 2026 06 06 03.0 04.50 34490.12500 34490.18750 3.667 22 0 2026 06 06 06.0 07.50 34490.25000 34490.31250 4.333 32 0 2026 06 06 09.0 10.50 34490.37500 34490.43750 2.667 12 0 2026 06 06 12.0 13.50 34490.50000 34490.56250 3.667 22 0 2026 06 06 15.0 16.50 34490.62500 34490.68750 2.667 12 0 2026 06 06 18.0 19.50 34490.75000 34490.81250 1.667 6 0 2026 06 06 21.0 22.50 34490.87500 34490.93750 2.333 9 0 2026 06 07 00.0 01.50 34491.00000 34491.06250 2.667 12 0 2026 06 07 03.0 04.50 34491.12500 34491.18750 1.667 6 0 2026 06 07 06.0 07.50 34491.25000 34491.31250 1.667 6 0 2026 06 07 09.0 10.50 34491.37500 34491.43750 2.333 9 0 2026 06 07 12.0 13.50 34491.50000 34491.56250 1.333 5 0 2026 06 07 15.0 16.50 34491.62500 34491.68750 2.000 7 0 2026 06 07 18.0 19.50 34491.75000 34491.81250 0.667 3 0 2026 06 07 21.0 22.50 34491.87500 34491.93750 1.667 6 0 2026 06 08 00.0 01.50 34492.00000 34492.06250 1.000 4 0 2026 06 08 03.0 04.50 34492.12500 34492.18750 2.000 7 0 2026 06 08 06.0 07.50 34492.25000 34492.31250 2.333 9 0 2026 06 08 09.0 10.50 34492.37500 34492.43750 2.333 9 0 2026 06 08 12.0 13.50 34492.50000 34492.56250 2.667 12 0 2026 06 08 15.0 16.50 34492.62500 34492.68750 1.333 5 0 2026 06 08 18.0 19.50 34492.75000 34492.81250 1.333 5 0 2026 06 08 21.0 22.50 34492.87500 34492.93750 1.667 6 0 2026 06 09 00.0 01.50 34493.00000 34493.06250 2.000 7 0 2026 06 09 03.0 04.50 34493.12500 34493.18750 2.333 9 0 2026 06 09 06.0 07.50 34493.25000 34493.31250 1.667 6 0 2026 06 09 09.0 10.50 34493.37500 34493.43750 2.000 7 0 2026 06 09 12.0 13.50 34493.50000 34493.56250 2.667 12 0 2026 06 09 15.0 16.50 34493.62500 34493.68750 3.667 22 0 2026 06 09 18.0 19.50 34493.75000 34493.81250 3.333 18 0 2026 06 09 21.0 22.50 34493.87500 34493.93750 2.667 12 0 2026 06 10 00.0 01.50 34494.00000 34494.06250 1.667 6 0 2026 06 10 03.0 04.50 34494.12500 34494.18750 1.000 4 0 2026 06 10 06.0 07.50 34494.25000 34494.31250 1.000 4 0 2026 06 10 09.0 10.50 34494.37500 34494.43750 2.667 12 0 2026 06 10 12.0 13.50 34494.50000 34494.56250 2.667 12 0 2026 06 10 15.0 16.50 34494.62500 34494.68750 1.667 6 0 2026 06 10 18.0 19.50 34494.75000 34494.81250 1.333 5 0 2026 06 10 21.0 22.50 34494.87500 34494.93750 1.333 5 0 2026 06 11 00.0 01.50 34495.00000 34495.06250 0.667 3 0 2026 06 11 03.0 04.50 34495.12500 34495.18750 2.333 9 0 2026 06 11 06.0 07.50 34495.25000 34495.31250 3.333 18 0 2026 06 11 09.0 10.50 34495.37500 34495.43750 3.000 15 0 2026 06 11 12.0 13.50 34495.50000 34495.56250 2.667 12 0 2026 06 11 15.0 16.50 34495.62500 34495.68750 2.333 9 0 2026 06 11 18.0 19.50 34495.75000 34495.81250 5.000 48 0 2026 06 11 21.0 22.50 34495.87500 34495.93750 4.000 27 0 2026 06 12 00.0 01.50 34496.00000 34496.06250 3.000 15 0 2026 06 12 03.0 04.50 34496.12500 34496.18750 3.333 18 0 2026 06 12 06.0 07.50 34496.25000 34496.31250 3.667 22 0 2026 06 12 09.0 10.50 34496.37500 34496.43750 3.000 15 0 2026 06 12 12.0 13.50 34496.50000 34496.56250 3.000 15 0 2026 06 12 15.0 16.50 34496.62500 34496.68750 1.667 6 0 2026 06 12 18.0 19.50 34496.75000 34496.81250 2.000 7 0 2026 06 12 21.0 22.50 34496.87500 34496.93750 2.667 12 0 2026 06 13 00.0 01.50 34497.00000 34497.06250 3.000 15 0 2026 06 13 03.0 04.50 34497.12500 34497.18750 3.000 15 0 2026 06 13 06.0 07.50 34497.25000 34497.31250 2.333 9 0 2026 06 13 09.0 10.50 34497.37500 34497.43750 2.667 12 0 2026 06 13 12.0 13.50 34497.50000 34497.56250 2.667 12 0 2026 06 13 15.0 16.50 34497.62500 34497.68750 2.333 9 0 2026 06 13 18.0 19.50 34497.75000 34497.81250 3.667 22 0 2026 06 13 21.0 22.50 34497.87500 34497.93750 2.333 9 0 2026 06 14 00.0 01.50 34498.00000 34498.06250 2.000 7 0 2026 06 14 03.0 04.50 34498.12500 34498.18750 1.667 6 0 2026 06 14 06.0 07.50 34498.25000 34498.31250 1.333 5 0 2026 06 14 09.0 10.50 34498.37500 34498.43750 2.000 7 0 2026 06 14 12.0 13.50 34498.50000 34498.56250 1.333 5 0 2026 06 14 15.0 16.50 34498.62500 34498.68750 1.333 5 0 2026 06 14 18.0 19.50 34498.75000 34498.81250 1.333 5 0 2026 06 14 21.0 22.50 34498.87500 34498.93750 1.333 5 0 2026 06 15 00.0 01.50 34499.00000 34499.06250 1.667 6 0 2026 06 15 03.0 04.50 34499.12500 34499.18750 1.000 4 0 2026 06 15 06.0 07.50 34499.25000 34499.31250 1.000 4 0 2026 06 15 09.0 10.50 34499.37500 34499.43750 0.667 3 0 2026 06 15 12.0 13.50 34499.50000 34499.56250 0.667 3 0 2026 06 15 15.0 16.50 34499.62500 34499.68750 0.333 2 0 2026 06 15 18.0 19.50 34499.75000 34499.81250 1.333 5 0 2026 06 15 21.0 22.50 34499.87500 34499.93750 1.667 6 0 2026 06 16 00.0 01.50 34500.00000 34500.06250 2.000 7 0 2026 06 16 03.0 04.50 34500.12500 34500.18750 1.333 5 0 2026 06 16 06.0 07.50 34500.25000 34500.31250 1.000 4 0 2026 06 16 09.0 10.50 34500.37500 34500.43750 1.000 4 0 2026 06 16 12.0 13.50 34500.50000 34500.56250 2.333 9 0 2026 06 16 15.0 16.50 34500.62500 34500.68750 2.333 9 0 2026 06 16 18.0 19.50 34500.75000 34500.81250 -1.000 -1 0 2026 06 16 21.0 22.50 34500.87500 34500.93750 -1.000 -1 0