# 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 2025 04 12 00.0 01.50 34070.00000 34070.06250 3.333 18 1 2025 04 12 03.0 04.50 34070.12500 34070.18750 2.333 9 1 2025 04 12 06.0 07.50 34070.25000 34070.31250 2.333 9 1 2025 04 12 09.0 10.50 34070.37500 34070.43750 3.000 15 1 2025 04 12 12.0 13.50 34070.50000 34070.56250 2.000 7 1 2025 04 12 15.0 16.50 34070.62500 34070.68750 3.333 18 1 2025 04 12 18.0 19.50 34070.75000 34070.81250 3.667 22 1 2025 04 12 21.0 22.50 34070.87500 34070.93750 4.333 32 1 2025 04 13 00.0 01.50 34071.00000 34071.06250 3.667 22 1 2025 04 13 03.0 04.50 34071.12500 34071.18750 3.333 18 1 2025 04 13 06.0 07.50 34071.25000 34071.31250 3.000 15 1 2025 04 13 09.0 10.50 34071.37500 34071.43750 2.333 9 1 2025 04 13 12.0 13.50 34071.50000 34071.56250 2.667 12 1 2025 04 13 15.0 16.50 34071.62500 34071.68750 1.667 6 1 2025 04 13 18.0 19.50 34071.75000 34071.81250 2.667 12 1 2025 04 13 21.0 22.50 34071.87500 34071.93750 2.333 9 1 2025 04 14 00.0 01.50 34072.00000 34072.06250 3.000 15 1 2025 04 14 03.0 04.50 34072.12500 34072.18750 4.667 39 1 2025 04 14 06.0 07.50 34072.25000 34072.31250 3.333 18 1 2025 04 14 09.0 10.50 34072.37500 34072.43750 1.667 6 1 2025 04 14 12.0 13.50 34072.50000 34072.56250 2.000 7 1 2025 04 14 15.0 16.50 34072.62500 34072.68750 3.333 18 1 2025 04 14 18.0 19.50 34072.75000 34072.81250 3.333 18 1 2025 04 14 21.0 22.50 34072.87500 34072.93750 3.667 22 1 2025 04 15 00.0 01.50 34073.00000 34073.06250 3.000 15 1 2025 04 15 03.0 04.50 34073.12500 34073.18750 2.000 7 1 2025 04 15 06.0 07.50 34073.25000 34073.31250 1.333 5 1 2025 04 15 09.0 10.50 34073.37500 34073.43750 1.000 4 1 2025 04 15 12.0 13.50 34073.50000 34073.56250 2.000 7 1 2025 04 15 15.0 16.50 34073.62500 34073.68750 5.000 48 1 2025 04 15 18.0 19.50 34073.75000 34073.81250 5.333 56 1 2025 04 15 21.0 22.50 34073.87500 34073.93750 6.333 94 1 2025 04 16 00.0 01.50 34074.00000 34074.06250 5.000 48 1 2025 04 16 03.0 04.50 34074.12500 34074.18750 3.333 18 1 2025 04 16 06.0 07.50 34074.25000 34074.31250 3.000 15 1 2025 04 16 09.0 10.50 34074.37500 34074.43750 4.667 39 1 2025 04 16 12.0 13.50 34074.50000 34074.56250 7.333 154 1 2025 04 16 15.0 16.50 34074.62500 34074.68750 6.333 94 1 2025 04 16 18.0 19.50 34074.75000 34074.81250 7.667 179 1 2025 04 16 21.0 22.50 34074.87500 34074.93750 5.333 56 1 2025 04 17 00.0 01.50 34075.00000 34075.06250 3.000 15 1 2025 04 17 03.0 04.50 34075.12500 34075.18750 3.667 22 1 2025 04 17 06.0 07.50 34075.25000 34075.31250 1.000 4 1 2025 04 17 09.0 10.50 34075.37500 34075.43750 0.667 3 1 2025 04 17 12.0 13.50 34075.50000 34075.56250 2.667 12 1 2025 04 17 15.0 16.50 34075.62500 34075.68750 2.000 7 1 2025 04 17 18.0 19.50 34075.75000 34075.81250 1.333 5 1 2025 04 17 21.0 22.50 34075.87500 34075.93750 1.667 6 1 2025 04 18 00.0 01.50 34076.00000 34076.06250 3.000 15 1 2025 04 18 03.0 04.50 34076.12500 34076.18750 4.333 32 1 2025 04 18 06.0 07.50 34076.25000 34076.31250 2.667 12 1 2025 04 18 09.0 10.50 34076.37500 34076.43750 1.667 6 1 2025 04 18 12.0 13.50 34076.50000 34076.56250 2.000 7 1 2025 04 18 15.0 16.50 34076.62500 34076.68750 2.000 7 1 2025 04 18 18.0 19.50 34076.75000 34076.81250 2.667 12 1 2025 04 18 21.0 22.50 34076.87500 34076.93750 2.667 12 1 2025 04 19 00.0 01.50 34077.00000 34077.06250 4.000 27 1 2025 04 19 03.0 04.50 34077.12500 34077.18750 3.333 18 1 2025 04 19 06.0 07.50 34077.25000 34077.31250 3.333 18 1 2025 04 19 09.0 10.50 34077.37500 34077.43750 2.000 7 1 2025 04 19 12.0 13.50 34077.50000 34077.56250 3.000 15 1 2025 04 19 15.0 16.50 34077.62500 34077.68750 3.333 18 1 2025 04 19 18.0 19.50 34077.75000 34077.81250 2.333 9 1 2025 04 19 21.0 22.50 34077.87500 34077.93750 4.667 39 1 2025 04 20 00.0 01.50 34078.00000 34078.06250 5.000 48 1 2025 04 20 03.0 04.50 34078.12500 34078.18750 2.333 9 1 2025 04 20 06.0 07.50 34078.25000 34078.31250 2.000 7 1 2025 04 20 09.0 10.50 34078.37500 34078.43750 1.333 5 1 2025 04 20 12.0 13.50 34078.50000 34078.56250 1.333 5 1 2025 04 20 15.0 16.50 34078.62500 34078.68750 1.000 4 1 2025 04 20 18.0 19.50 34078.75000 34078.81250 2.667 12 1 2025 04 20 21.0 22.50 34078.87500 34078.93750 2.667 12 1 2025 04 21 00.0 01.50 34079.00000 34079.06250 4.000 27 1 2025 04 21 03.0 04.50 34079.12500 34079.18750 4.333 32 1 2025 04 21 06.0 07.50 34079.25000 34079.31250 4.667 39 1 2025 04 21 09.0 10.50 34079.37500 34079.43750 4.333 32 1 2025 04 21 12.0 13.50 34079.50000 34079.56250 5.333 56 1 2025 04 21 15.0 16.50 34079.62500 34079.68750 4.333 32 1 2025 04 21 18.0 19.50 34079.75000 34079.81250 5.000 48 1 2025 04 21 21.0 22.50 34079.87500 34079.93750 2.333 9 1 2025 04 22 00.0 01.50 34080.00000 34080.06250 3.667 22 1 2025 04 22 03.0 04.50 34080.12500 34080.18750 3.333 18 1 2025 04 22 06.0 07.50 34080.25000 34080.31250 2.667 12 1 2025 04 22 09.0 10.50 34080.37500 34080.43750 1.667 6 1 2025 04 22 12.0 13.50 34080.50000 34080.56250 1.667 6 1 2025 04 22 15.0 16.50 34080.62500 34080.68750 3.000 15 1 2025 04 22 18.0 19.50 34080.75000 34080.81250 3.000 15 1 2025 04 22 21.0 22.50 34080.87500 34080.93750 2.667 12 1 2025 04 23 00.0 01.50 34081.00000 34081.06250 1.000 4 1 2025 04 23 03.0 04.50 34081.12500 34081.18750 2.333 9 1 2025 04 23 06.0 07.50 34081.25000 34081.31250 1.667 6 1 2025 04 23 09.0 10.50 34081.37500 34081.43750 2.667 12 1 2025 04 23 12.0 13.50 34081.50000 34081.56250 1.667 6 1 2025 04 23 15.0 16.50 34081.62500 34081.68750 1.333 5 1 2025 04 23 18.0 19.50 34081.75000 34081.81250 0.667 3 1 2025 04 23 21.0 22.50 34081.87500 34081.93750 0.667 3 1 2025 04 24 00.0 01.50 34082.00000 34082.06250 2.333 9 1 2025 04 24 03.0 04.50 34082.12500 34082.18750 2.667 12 1 2025 04 24 06.0 07.50 34082.25000 34082.31250 3.667 22 1 2025 04 24 09.0 10.50 34082.37500 34082.43750 3.333 18 1 2025 04 24 12.0 13.50 34082.50000 34082.56250 3.667 22 1 2025 04 24 15.0 16.50 34082.62500 34082.68750 2.000 7 1 2025 04 24 18.0 19.50 34082.75000 34082.81250 2.000 7 1 2025 04 24 21.0 22.50 34082.87500 34082.93750 1.333 5 1 2025 04 25 00.0 01.50 34083.00000 34083.06250 0.667 3 1 2025 04 25 03.0 04.50 34083.12500 34083.18750 0.667 3 1 2025 04 25 06.0 07.50 34083.25000 34083.31250 1.000 4 1 2025 04 25 09.0 10.50 34083.37500 34083.43750 1.000 4 1 2025 04 25 12.0 13.50 34083.50000 34083.56250 1.000 4 1 2025 04 25 15.0 16.50 34083.62500 34083.68750 1.000 4 1 2025 04 25 18.0 19.50 34083.75000 34083.81250 1.667 6 1 2025 04 25 21.0 22.50 34083.87500 34083.93750 2.000 7 1 2025 04 26 00.0 01.50 34084.00000 34084.06250 1.333 5 1 2025 04 26 03.0 04.50 34084.12500 34084.18750 1.333 5 1 2025 04 26 06.0 07.50 34084.25000 34084.31250 1.000 4 1 2025 04 26 09.0 10.50 34084.37500 34084.43750 2.000 7 1 2025 04 26 12.0 13.50 34084.50000 34084.56250 2.000 7 1 2025 04 26 15.0 16.50 34084.62500 34084.68750 1.667 6 1 2025 04 26 18.0 19.50 34084.75000 34084.81250 1.333 5 1 2025 04 26 21.0 22.50 34084.87500 34084.93750 1.333 5 1 2025 04 27 00.0 01.50 34085.00000 34085.06250 1.000 4 1 2025 04 27 03.0 04.50 34085.12500 34085.18750 2.333 9 1 2025 04 27 06.0 07.50 34085.25000 34085.31250 1.333 5 1 2025 04 27 09.0 10.50 34085.37500 34085.43750 1.000 4 1 2025 04 27 12.0 13.50 34085.50000 34085.56250 1.000 4 1 2025 04 27 15.0 16.50 34085.62500 34085.68750 2.667 12 1 2025 04 27 18.0 19.50 34085.75000 34085.81250 2.000 7 1 2025 04 27 21.0 22.50 34085.87500 34085.93750 1.667 6 1 2025 04 28 00.0 01.50 34086.00000 34086.06250 2.333 9 1 2025 04 28 03.0 04.50 34086.12500 34086.18750 0.333 2 1 2025 04 28 06.0 07.50 34086.25000 34086.31250 0.333 2 1 2025 04 28 09.0 10.50 34086.37500 34086.43750 1.000 4 1 2025 04 28 12.0 13.50 34086.50000 34086.56250 0.667 3 1 2025 04 28 15.0 16.50 34086.62500 34086.68750 0.667 3 1 2025 04 28 18.0 19.50 34086.75000 34086.81250 0.667 3 1 2025 04 28 21.0 22.50 34086.87500 34086.93750 0.333 2 1 2025 04 29 00.0 01.50 34087.00000 34087.06250 0.000 0 1 2025 04 29 03.0 04.50 34087.12500 34087.18750 1.333 5 1 2025 04 29 06.0 07.50 34087.25000 34087.31250 2.000 7 1 2025 04 29 09.0 10.50 34087.37500 34087.43750 1.667 6 1 2025 04 29 12.0 13.50 34087.50000 34087.56250 1.333 5 1 2025 04 29 15.0 16.50 34087.62500 34087.68750 1.333 5 1 2025 04 29 18.0 19.50 34087.75000 34087.81250 2.000 7 1 2025 04 29 21.0 22.50 34087.87500 34087.93750 1.333 5 1 2025 04 30 00.0 01.50 34088.00000 34088.06250 3.333 18 1 2025 04 30 03.0 04.50 34088.12500 34088.18750 2.333 9 1 2025 04 30 06.0 07.50 34088.25000 34088.31250 2.667 12 1 2025 04 30 09.0 10.50 34088.37500 34088.43750 2.667 12 1 2025 04 30 12.0 13.50 34088.50000 34088.56250 1.667 6 1 2025 04 30 15.0 16.50 34088.62500 34088.68750 1.333 5 1 2025 04 30 18.0 19.50 34088.75000 34088.81250 1.000 4 1 2025 04 30 21.0 22.50 34088.87500 34088.93750 2.667 12 1 2025 05 01 00.0 01.50 34089.00000 34089.06250 3.333 18 0 2025 05 01 03.0 04.50 34089.12500 34089.18750 4.000 27 0 2025 05 01 06.0 07.50 34089.25000 34089.31250 3.667 22 0 2025 05 01 09.0 10.50 34089.37500 34089.43750 4.000 27 0 2025 05 01 12.0 13.50 34089.50000 34089.56250 4.000 27 0 2025 05 01 15.0 16.50 34089.62500 34089.68750 3.333 18 0 2025 05 01 18.0 19.50 34089.75000 34089.81250 4.667 39 0 2025 05 01 21.0 22.50 34089.87500 34089.93750 4.667 39 0 2025 05 02 00.0 01.50 34090.00000 34090.06250 5.000 48 0 2025 05 02 03.0 04.50 34090.12500 34090.18750 5.000 48 0 2025 05 02 06.0 07.50 34090.25000 34090.31250 4.000 27 0 2025 05 02 09.0 10.50 34090.37500 34090.43750 4.333 32 0 2025 05 02 12.0 13.50 34090.50000 34090.56250 4.667 39 0 2025 05 02 15.0 16.50 34090.62500 34090.68750 4.667 39 0 2025 05 02 18.0 19.50 34090.75000 34090.81250 3.667 22 0 2025 05 02 21.0 22.50 34090.87500 34090.93750 5.000 48 0 2025 05 03 00.0 01.50 34091.00000 34091.06250 5.333 56 0 2025 05 03 03.0 04.50 34091.12500 34091.18750 4.000 27 0 2025 05 03 06.0 07.50 34091.25000 34091.31250 4.000 27 0 2025 05 03 09.0 10.50 34091.37500 34091.43750 4.667 39 0 2025 05 03 12.0 13.50 34091.50000 34091.56250 3.333 18 0 2025 05 03 15.0 16.50 34091.62500 34091.68750 3.000 15 0 2025 05 03 18.0 19.50 34091.75000 34091.81250 2.667 12 0 2025 05 03 21.0 22.50 34091.87500 34091.93750 3.667 22 0 2025 05 04 00.0 01.50 34092.00000 34092.06250 4.000 27 0 2025 05 04 03.0 04.50 34092.12500 34092.18750 3.333 18 0 2025 05 04 06.0 07.50 34092.25000 34092.31250 4.667 39 0 2025 05 04 09.0 10.50 34092.37500 34092.43750 2.333 9 0 2025 05 04 12.0 13.50 34092.50000 34092.56250 3.667 22 0 2025 05 04 15.0 16.50 34092.62500 34092.68750 4.333 32 0 2025 05 04 18.0 19.50 34092.75000 34092.81250 4.000 27 0 2025 05 04 21.0 22.50 34092.87500 34092.93750 4.000 27 0 2025 05 05 00.0 01.50 34093.00000 34093.06250 3.333 18 0 2025 05 05 03.0 04.50 34093.12500 34093.18750 4.667 39 0 2025 05 05 06.0 07.50 34093.25000 34093.31250 4.333 32 0 2025 05 05 09.0 10.50 34093.37500 34093.43750 4.333 32 0 2025 05 05 12.0 13.50 34093.50000 34093.56250 4.000 27 0 2025 05 05 15.0 16.50 34093.62500 34093.68750 4.333 32 0 2025 05 05 18.0 19.50 34093.75000 34093.81250 4.000 27 0 2025 05 05 21.0 22.50 34093.87500 34093.93750 4.000 27 0 2025 05 06 00.0 01.50 34094.00000 34094.06250 3.333 18 0 2025 05 06 03.0 04.50 34094.12500 34094.18750 2.333 9 0 2025 05 06 06.0 07.50 34094.25000 34094.31250 2.333 9 0 2025 05 06 09.0 10.50 34094.37500 34094.43750 2.667 12 0 2025 05 06 12.0 13.50 34094.50000 34094.56250 2.333 9 0 2025 05 06 15.0 16.50 34094.62500 34094.68750 2.333 9 0 2025 05 06 18.0 19.50 34094.75000 34094.81250 3.333 18 0 2025 05 06 21.0 22.50 34094.87500 34094.93750 3.667 22 0 2025 05 07 00.0 01.50 34095.00000 34095.06250 2.333 9 0 2025 05 07 03.0 04.50 34095.12500 34095.18750 2.667 12 0 2025 05 07 06.0 07.50 34095.25000 34095.31250 2.333 9 0 2025 05 07 09.0 10.50 34095.37500 34095.43750 2.000 7 0 2025 05 07 12.0 13.50 34095.50000 34095.56250 1.667 6 0 2025 05 07 15.0 16.50 34095.62500 34095.68750 0.667 3 0 2025 05 07 18.0 19.50 34095.75000 34095.81250 1.000 4 0 2025 05 07 21.0 22.50 34095.87500 34095.93750 2.000 7 0 2025 05 08 00.0 01.50 34096.00000 34096.06250 2.333 9 0 2025 05 08 03.0 04.50 34096.12500 34096.18750 3.000 15 0 2025 05 08 06.0 07.50 34096.25000 34096.31250 3.000 15 0 2025 05 08 09.0 10.50 34096.37500 34096.43750 1.667 6 0 2025 05 08 12.0 13.50 34096.50000 34096.56250 2.000 7 0 2025 05 08 15.0 16.50 34096.62500 34096.68750 2.000 7 0 2025 05 08 18.0 19.50 34096.75000 34096.81250 0.667 3 0 2025 05 08 21.0 22.50 34096.87500 34096.93750 4.000 27 0 2025 05 09 00.0 01.50 34097.00000 34097.06250 2.667 12 0 2025 05 09 03.0 04.50 34097.12500 34097.18750 2.000 7 0 2025 05 09 06.0 07.50 34097.25000 34097.31250 1.333 5 0 2025 05 09 09.0 10.50 34097.37500 34097.43750 1.667 6 0 2025 05 09 12.0 13.50 34097.50000 34097.56250 2.333 9 0 2025 05 09 15.0 16.50 34097.62500 34097.68750 3.333 18 0 2025 05 09 18.0 19.50 34097.75000 34097.81250 4.000 27 0 2025 05 09 21.0 22.50 34097.87500 34097.93750 4.333 32 0 2025 05 10 00.0 01.50 34098.00000 34098.06250 4.667 39 0 2025 05 10 03.0 04.50 34098.12500 34098.18750 3.667 22 0 2025 05 10 06.0 07.50 34098.25000 34098.31250 1.667 6 0 2025 05 10 09.0 10.50 34098.37500 34098.43750 2.000 7 0 2025 05 10 12.0 13.50 34098.50000 34098.56250 1.667 6 0 2025 05 10 15.0 16.50 34098.62500 34098.68750 1.000 4 0 2025 05 10 18.0 19.50 34098.75000 34098.81250 1.333 5 0 2025 05 10 21.0 22.50 34098.87500 34098.93750 2.000 7 0 2025 05 11 00.0 01.50 34099.00000 34099.06250 2.667 12 0 2025 05 11 03.0 04.50 34099.12500 34099.18750 3.000 15 0 2025 05 11 06.0 07.50 34099.25000 34099.31250 2.000 7 0 2025 05 11 09.0 10.50 34099.37500 34099.43750 1.667 6 0 2025 05 11 12.0 13.50 34099.50000 34099.56250 3.000 15 0 2025 05 11 15.0 16.50 34099.62500 34099.68750 -1.000 -1 0 2025 05 11 18.0 19.50 34099.75000 34099.81250 -1.000 -1 0 2025 05 11 21.0 22.50 34099.87500 34099.93750 -1.000 -1 0