# 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 03 17 00.0 01.50 34409.00000 34409.06250 1.667 6 1 2026 03 17 03.0 04.50 34409.12500 34409.18750 1.000 4 1 2026 03 17 06.0 07.50 34409.25000 34409.31250 1.000 4 1 2026 03 17 09.0 10.50 34409.37500 34409.43750 0.667 3 1 2026 03 17 12.0 13.50 34409.50000 34409.56250 0.667 3 1 2026 03 17 15.0 16.50 34409.62500 34409.68750 0.333 2 1 2026 03 17 18.0 19.50 34409.75000 34409.81250 0.667 3 1 2026 03 17 21.0 22.50 34409.87500 34409.93750 0.667 3 1 2026 03 18 00.0 01.50 34410.00000 34410.06250 0.333 2 1 2026 03 18 03.0 04.50 34410.12500 34410.18750 1.000 4 1 2026 03 18 06.0 07.50 34410.25000 34410.31250 1.000 4 1 2026 03 18 09.0 10.50 34410.37500 34410.43750 1.333 5 1 2026 03 18 12.0 13.50 34410.50000 34410.56250 0.667 3 1 2026 03 18 15.0 16.50 34410.62500 34410.68750 0.667 3 1 2026 03 18 18.0 19.50 34410.75000 34410.81250 0.667 3 1 2026 03 18 21.0 22.50 34410.87500 34410.93750 1.667 6 1 2026 03 19 00.0 01.50 34411.00000 34411.06250 0.000 0 1 2026 03 19 03.0 04.50 34411.12500 34411.18750 0.333 2 1 2026 03 19 06.0 07.50 34411.25000 34411.31250 0.333 2 1 2026 03 19 09.0 10.50 34411.37500 34411.43750 0.333 2 1 2026 03 19 12.0 13.50 34411.50000 34411.56250 1.000 4 1 2026 03 19 15.0 16.50 34411.62500 34411.68750 0.667 3 1 2026 03 19 18.0 19.50 34411.75000 34411.81250 0.000 0 1 2026 03 19 21.0 22.50 34411.87500 34411.93750 0.000 0 1 2026 03 20 00.0 01.50 34412.00000 34412.06250 1.333 5 1 2026 03 20 03.0 04.50 34412.12500 34412.18750 2.667 12 1 2026 03 20 06.0 07.50 34412.25000 34412.31250 3.333 18 1 2026 03 20 09.0 10.50 34412.37500 34412.43750 3.667 22 1 2026 03 20 12.0 13.50 34412.50000 34412.56250 3.000 15 1 2026 03 20 15.0 16.50 34412.62500 34412.68750 3.333 18 1 2026 03 20 18.0 19.50 34412.75000 34412.81250 5.333 56 1 2026 03 20 21.0 22.50 34412.87500 34412.93750 6.333 94 1 2026 03 21 00.0 01.50 34413.00000 34413.06250 7.000 132 1 2026 03 21 03.0 04.50 34413.12500 34413.18750 5.667 67 1 2026 03 21 06.0 07.50 34413.25000 34413.31250 5.000 48 1 2026 03 21 09.0 10.50 34413.37500 34413.43750 4.000 27 1 2026 03 21 12.0 13.50 34413.50000 34413.56250 3.333 18 1 2026 03 21 15.0 16.50 34413.62500 34413.68750 3.000 15 1 2026 03 21 18.0 19.50 34413.75000 34413.81250 3.667 22 1 2026 03 21 21.0 22.50 34413.87500 34413.93750 2.667 12 1 2026 03 22 00.0 01.50 34414.00000 34414.06250 3.667 22 1 2026 03 22 03.0 04.50 34414.12500 34414.18750 4.667 39 1 2026 03 22 06.0 07.50 34414.25000 34414.31250 4.667 39 1 2026 03 22 09.0 10.50 34414.37500 34414.43750 6.333 94 1 2026 03 22 12.0 13.50 34414.50000 34414.56250 6.000 80 1 2026 03 22 15.0 16.50 34414.62500 34414.68750 7.000 132 1 2026 03 22 18.0 19.50 34414.75000 34414.81250 6.667 111 1 2026 03 22 21.0 22.50 34414.87500 34414.93750 6.667 111 1 2026 03 23 00.0 01.50 34415.00000 34415.06250 5.000 48 1 2026 03 23 03.0 04.50 34415.12500 34415.18750 3.667 22 1 2026 03 23 06.0 07.50 34415.25000 34415.31250 3.333 18 1 2026 03 23 09.0 10.50 34415.37500 34415.43750 2.667 12 1 2026 03 23 12.0 13.50 34415.50000 34415.56250 4.667 39 1 2026 03 23 15.0 16.50 34415.62500 34415.68750 5.000 48 1 2026 03 23 18.0 19.50 34415.75000 34415.81250 4.333 32 1 2026 03 23 21.0 22.50 34415.87500 34415.93750 4.333 32 1 2026 03 24 00.0 01.50 34416.00000 34416.06250 2.667 12 1 2026 03 24 03.0 04.50 34416.12500 34416.18750 3.667 22 1 2026 03 24 06.0 07.50 34416.25000 34416.31250 3.000 15 1 2026 03 24 09.0 10.50 34416.37500 34416.43750 3.333 18 1 2026 03 24 12.0 13.50 34416.50000 34416.56250 3.000 15 1 2026 03 24 15.0 16.50 34416.62500 34416.68750 3.000 15 1 2026 03 24 18.0 19.50 34416.75000 34416.81250 3.000 15 1 2026 03 24 21.0 22.50 34416.87500 34416.93750 2.333 9 1 2026 03 25 00.0 01.50 34417.00000 34417.06250 2.667 12 1 2026 03 25 03.0 04.50 34417.12500 34417.18750 3.333 18 1 2026 03 25 06.0 07.50 34417.25000 34417.31250 5.000 48 1 2026 03 25 09.0 10.50 34417.37500 34417.43750 3.333 18 1 2026 03 25 12.0 13.50 34417.50000 34417.56250 1.000 4 1 2026 03 25 15.0 16.50 34417.62500 34417.68750 1.667 6 1 2026 03 25 18.0 19.50 34417.75000 34417.81250 2.667 12 1 2026 03 25 21.0 22.50 34417.87500 34417.93750 0.333 2 1 2026 03 26 00.0 01.50 34418.00000 34418.06250 2.333 9 1 2026 03 26 03.0 04.50 34418.12500 34418.18750 1.667 6 1 2026 03 26 06.0 07.50 34418.25000 34418.31250 2.000 7 1 2026 03 26 09.0 10.50 34418.37500 34418.43750 1.667 6 1 2026 03 26 12.0 13.50 34418.50000 34418.56250 2.333 9 1 2026 03 26 15.0 16.50 34418.62500 34418.68750 3.000 15 1 2026 03 26 18.0 19.50 34418.75000 34418.81250 2.000 7 1 2026 03 26 21.0 22.50 34418.87500 34418.93750 2.000 7 1 2026 03 27 00.0 01.50 34419.00000 34419.06250 1.333 5 1 2026 03 27 03.0 04.50 34419.12500 34419.18750 2.000 7 1 2026 03 27 06.0 07.50 34419.25000 34419.31250 1.333 5 1 2026 03 27 09.0 10.50 34419.37500 34419.43750 1.000 4 1 2026 03 27 12.0 13.50 34419.50000 34419.56250 1.000 4 1 2026 03 27 15.0 16.50 34419.62500 34419.68750 2.000 7 1 2026 03 27 18.0 19.50 34419.75000 34419.81250 1.667 6 1 2026 03 27 21.0 22.50 34419.87500 34419.93750 2.333 9 1 2026 03 28 00.0 01.50 34420.00000 34420.06250 3.333 18 1 2026 03 28 03.0 04.50 34420.12500 34420.18750 1.333 5 1 2026 03 28 06.0 07.50 34420.25000 34420.31250 2.667 12 1 2026 03 28 09.0 10.50 34420.37500 34420.43750 2.333 9 1 2026 03 28 12.0 13.50 34420.50000 34420.56250 1.333 5 1 2026 03 28 15.0 16.50 34420.62500 34420.68750 1.667 6 1 2026 03 28 18.0 19.50 34420.75000 34420.81250 1.333 5 1 2026 03 28 21.0 22.50 34420.87500 34420.93750 3.000 15 1 2026 03 29 00.0 01.50 34421.00000 34421.06250 3.333 18 1 2026 03 29 03.0 04.50 34421.12500 34421.18750 3.667 22 1 2026 03 29 06.0 07.50 34421.25000 34421.31250 3.000 15 1 2026 03 29 09.0 10.50 34421.37500 34421.43750 1.667 6 1 2026 03 29 12.0 13.50 34421.50000 34421.56250 3.333 18 1 2026 03 29 15.0 16.50 34421.62500 34421.68750 3.667 22 1 2026 03 29 18.0 19.50 34421.75000 34421.81250 1.000 4 1 2026 03 29 21.0 22.50 34421.87500 34421.93750 1.667 6 1 2026 03 30 00.0 01.50 34422.00000 34422.06250 2.000 7 1 2026 03 30 03.0 04.50 34422.12500 34422.18750 2.667 12 1 2026 03 30 06.0 07.50 34422.25000 34422.31250 3.333 18 1 2026 03 30 09.0 10.50 34422.37500 34422.43750 2.667 12 1 2026 03 30 12.0 13.50 34422.50000 34422.56250 3.333 18 1 2026 03 30 15.0 16.50 34422.62500 34422.68750 1.667 6 1 2026 03 30 18.0 19.50 34422.75000 34422.81250 2.000 7 1 2026 03 30 21.0 22.50 34422.87500 34422.93750 1.000 4 1 2026 03 31 00.0 01.50 34423.00000 34423.06250 1.000 4 1 2026 03 31 03.0 04.50 34423.12500 34423.18750 2.667 12 1 2026 03 31 06.0 07.50 34423.25000 34423.31250 1.667 6 1 2026 03 31 09.0 10.50 34423.37500 34423.43750 1.667 6 1 2026 03 31 12.0 13.50 34423.50000 34423.56250 2.000 7 1 2026 03 31 15.0 16.50 34423.62500 34423.68750 1.667 6 1 2026 03 31 18.0 19.50 34423.75000 34423.81250 1.000 4 1 2026 03 31 21.0 22.50 34423.87500 34423.93750 1.333 5 1 2026 04 01 00.0 01.50 34424.00000 34424.06250 3.000 15 0 2026 04 01 03.0 04.50 34424.12500 34424.18750 1.667 6 0 2026 04 01 06.0 07.50 34424.25000 34424.31250 1.000 4 0 2026 04 01 09.0 10.50 34424.37500 34424.43750 1.000 4 0 2026 04 01 12.0 13.50 34424.50000 34424.56250 3.000 15 0 2026 04 01 15.0 16.50 34424.62500 34424.68750 2.333 9 0 2026 04 01 18.0 19.50 34424.75000 34424.81250 1.333 5 0 2026 04 01 21.0 22.50 34424.87500 34424.93750 2.333 9 0 2026 04 02 00.0 01.50 34425.00000 34425.06250 4.667 39 0 2026 04 02 03.0 04.50 34425.12500 34425.18750 4.333 32 0 2026 04 02 06.0 07.50 34425.25000 34425.31250 5.000 48 0 2026 04 02 09.0 10.50 34425.37500 34425.43750 4.667 39 0 2026 04 02 12.0 13.50 34425.50000 34425.56250 5.000 48 0 2026 04 02 15.0 16.50 34425.62500 34425.68750 6.000 80 0 2026 04 02 18.0 19.50 34425.75000 34425.81250 4.667 39 0 2026 04 02 21.0 22.50 34425.87500 34425.93750 3.667 22 0 2026 04 03 00.0 01.50 34426.00000 34426.06250 3.667 22 0 2026 04 03 03.0 04.50 34426.12500 34426.18750 3.333 18 0 2026 04 03 06.0 07.50 34426.25000 34426.31250 5.333 56 0 2026 04 03 09.0 10.50 34426.37500 34426.43750 4.000 27 0 2026 04 03 12.0 13.50 34426.50000 34426.56250 3.667 22 0 2026 04 03 15.0 16.50 34426.62500 34426.68750 6.667 111 0 2026 04 03 18.0 19.50 34426.75000 34426.81250 5.333 56 0 2026 04 03 21.0 22.50 34426.87500 34426.93750 5.667 67 0 2026 04 04 00.0 01.50 34427.00000 34427.06250 4.000 27 0 2026 04 04 03.0 04.50 34427.12500 34427.18750 4.000 27 0 2026 04 04 06.0 07.50 34427.25000 34427.31250 2.667 12 0 2026 04 04 09.0 10.50 34427.37500 34427.43750 2.333 9 0 2026 04 04 12.0 13.50 34427.50000 34427.56250 0.667 3 0 2026 04 04 15.0 16.50 34427.62500 34427.68750 1.667 6 0 2026 04 04 18.0 19.50 34427.75000 34427.81250 4.000 27 0 2026 04 04 21.0 22.50 34427.87500 34427.93750 2.000 7 0 2026 04 05 00.0 01.50 34428.00000 34428.06250 3.667 22 0 2026 04 05 03.0 04.50 34428.12500 34428.18750 3.333 18 0 2026 04 05 06.0 07.50 34428.25000 34428.31250 3.000 15 0 2026 04 05 09.0 10.50 34428.37500 34428.43750 2.333 9 0 2026 04 05 12.0 13.50 34428.50000 34428.56250 2.333 9 0 2026 04 05 15.0 16.50 34428.62500 34428.68750 3.000 15 0 2026 04 05 18.0 19.50 34428.75000 34428.81250 1.333 5 0 2026 04 05 21.0 22.50 34428.87500 34428.93750 0.667 3 0 2026 04 06 00.0 01.50 34429.00000 34429.06250 1.333 5 0 2026 04 06 03.0 04.50 34429.12500 34429.18750 2.667 12 0 2026 04 06 06.0 07.50 34429.25000 34429.31250 2.000 7 0 2026 04 06 09.0 10.50 34429.37500 34429.43750 2.000 7 0 2026 04 06 12.0 13.50 34429.50000 34429.56250 2.000 7 0 2026 04 06 15.0 16.50 34429.62500 34429.68750 2.667 12 0 2026 04 06 18.0 19.50 34429.75000 34429.81250 2.667 12 0 2026 04 06 21.0 22.50 34429.87500 34429.93750 2.333 9 0 2026 04 07 00.0 01.50 34430.00000 34430.06250 3.000 15 0 2026 04 07 03.0 04.50 34430.12500 34430.18750 2.333 9 0 2026 04 07 06.0 07.50 34430.25000 34430.31250 1.333 5 0 2026 04 07 09.0 10.50 34430.37500 34430.43750 0.333 2 0 2026 04 07 12.0 13.50 34430.50000 34430.56250 1.333 5 0 2026 04 07 15.0 16.50 34430.62500 34430.68750 2.333 9 0 2026 04 07 18.0 19.50 34430.75000 34430.81250 1.333 5 0 2026 04 07 21.0 22.50 34430.87500 34430.93750 3.000 15 0 2026 04 08 00.0 01.50 34431.00000 34431.06250 2.333 9 0 2026 04 08 03.0 04.50 34431.12500 34431.18750 1.667 6 0 2026 04 08 06.0 07.50 34431.25000 34431.31250 1.000 4 0 2026 04 08 09.0 10.50 34431.37500 34431.43750 2.000 7 0 2026 04 08 12.0 13.50 34431.50000 34431.56250 2.000 7 0 2026 04 08 15.0 16.50 34431.62500 34431.68750 1.667 6 0 2026 04 08 18.0 19.50 34431.75000 34431.81250 2.333 9 0 2026 04 08 21.0 22.50 34431.87500 34431.93750 1.333 5 0 2026 04 09 00.0 01.50 34432.00000 34432.06250 1.333 5 0 2026 04 09 03.0 04.50 34432.12500 34432.18750 1.000 4 0 2026 04 09 06.0 07.50 34432.25000 34432.31250 2.000 7 0 2026 04 09 09.0 10.50 34432.37500 34432.43750 1.000 4 0 2026 04 09 12.0 13.50 34432.50000 34432.56250 2.333 9 0 2026 04 09 15.0 16.50 34432.62500 34432.68750 1.667 6 0 2026 04 09 18.0 19.50 34432.75000 34432.81250 1.667 6 0 2026 04 09 21.0 22.50 34432.87500 34432.93750 2.333 9 0 2026 04 10 00.0 01.50 34433.00000 34433.06250 3.667 22 0 2026 04 10 03.0 04.50 34433.12500 34433.18750 2.667 12 0 2026 04 10 06.0 07.50 34433.25000 34433.31250 2.333 9 0 2026 04 10 09.0 10.50 34433.37500 34433.43750 1.667 6 0 2026 04 10 12.0 13.50 34433.50000 34433.56250 4.333 32 0 2026 04 10 15.0 16.50 34433.62500 34433.68750 3.667 22 0 2026 04 10 18.0 19.50 34433.75000 34433.81250 3.667 22 0 2026 04 10 21.0 22.50 34433.87500 34433.93750 1.667 6 0 2026 04 11 00.0 01.50 34434.00000 34434.06250 2.000 7 0 2026 04 11 03.0 04.50 34434.12500 34434.18750 4.000 27 0 2026 04 11 06.0 07.50 34434.25000 34434.31250 3.667 22 0 2026 04 11 09.0 10.50 34434.37500 34434.43750 3.333 18 0 2026 04 11 12.0 13.50 34434.50000 34434.56250 2.333 9 0 2026 04 11 15.0 16.50 34434.62500 34434.68750 1.667 6 0 2026 04 11 18.0 19.50 34434.75000 34434.81250 1.667 6 0 2026 04 11 21.0 22.50 34434.87500 34434.93750 1.000 4 0 2026 04 12 00.0 01.50 34435.00000 34435.06250 2.000 7 0 2026 04 12 03.0 04.50 34435.12500 34435.18750 2.333 9 0 2026 04 12 06.0 07.50 34435.25000 34435.31250 2.000 7 0 2026 04 12 09.0 10.50 34435.37500 34435.43750 2.000 7 0 2026 04 12 12.0 13.50 34435.50000 34435.56250 2.333 9 0 2026 04 12 15.0 16.50 34435.62500 34435.68750 1.333 5 0 2026 04 12 18.0 19.50 34435.75000 34435.81250 1.667 6 0 2026 04 12 21.0 22.50 34435.87500 34435.93750 2.000 7 0 2026 04 13 00.0 01.50 34436.00000 34436.06250 0.333 2 0 2026 04 13 03.0 04.50 34436.12500 34436.18750 1.000 4 0 2026 04 13 06.0 07.50 34436.25000 34436.31250 0.667 3 0 2026 04 13 09.0 10.50 34436.37500 34436.43750 0.333 2 0 2026 04 13 12.0 13.50 34436.50000 34436.56250 0.333 2 0 2026 04 13 15.0 16.50 34436.62500 34436.68750 1.000 4 0 2026 04 13 18.0 19.50 34436.75000 34436.81250 0.667 3 0 2026 04 13 21.0 22.50 34436.87500 34436.93750 1.000 4 0 2026 04 14 00.0 01.50 34437.00000 34437.06250 1.333 5 0 2026 04 14 03.0 04.50 34437.12500 34437.18750 0.000 0 0 2026 04 14 06.0 07.50 34437.25000 34437.31250 0.000 0 0 2026 04 14 09.0 10.50 34437.37500 34437.43750 1.000 4 0 2026 04 14 12.0 13.50 34437.50000 34437.56250 1.000 4 0 2026 04 14 15.0 16.50 34437.62500 34437.68750 1.000 4 0 2026 04 14 18.0 19.50 34437.75000 34437.81250 0.333 2 0 2026 04 14 21.0 22.50 34437.87500 34437.93750 0.333 2 0 2026 04 15 00.0 01.50 34438.00000 34438.06250 1.000 4 0 2026 04 15 03.0 04.50 34438.12500 34438.18750 1.000 4 0 2026 04 15 06.0 07.50 34438.25000 34438.31250 1.000 4 0 2026 04 15 09.0 10.50 34438.37500 34438.43750 0.000 0 0 2026 04 15 12.0 13.50 34438.50000 34438.56250 1.000 4 0 2026 04 15 15.0 16.50 34438.62500 34438.68750 1.667 6 0 2026 04 15 18.0 19.50 34438.75000 34438.81250 1.000 4 0 2026 04 15 21.0 22.50 34438.87500 34438.93750 1.333 5 0