# 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 10 17 00.0 01.50 34258.00000 34258.06250 1.667 6 0 2025 10 17 03.0 04.50 34258.12500 34258.18750 1.333 5 0 2025 10 17 06.0 07.50 34258.25000 34258.31250 2.333 9 0 2025 10 17 09.0 10.50 34258.37500 34258.43750 3.333 18 0 2025 10 17 12.0 13.50 34258.50000 34258.56250 2.333 9 0 2025 10 17 15.0 16.50 34258.62500 34258.68750 2.667 12 0 2025 10 17 18.0 19.50 34258.75000 34258.81250 1.667 6 0 2025 10 17 21.0 22.50 34258.87500 34258.93750 1.333 5 0 2025 10 18 00.0 01.50 34259.00000 34259.06250 3.333 18 0 2025 10 18 03.0 04.50 34259.12500 34259.18750 4.333 32 0 2025 10 18 06.0 07.50 34259.25000 34259.31250 4.667 39 0 2025 10 18 09.0 10.50 34259.37500 34259.43750 4.000 27 0 2025 10 18 12.0 13.50 34259.50000 34259.56250 3.333 18 0 2025 10 18 15.0 16.50 34259.62500 34259.68750 4.667 39 0 2025 10 18 18.0 19.50 34259.75000 34259.81250 6.333 94 0 2025 10 18 21.0 22.50 34259.87500 34259.93750 4.333 32 0 2025 10 19 00.0 01.50 34260.00000 34260.06250 5.333 56 0 2025 10 19 03.0 04.50 34260.12500 34260.18750 3.000 15 0 2025 10 19 06.0 07.50 34260.25000 34260.31250 1.667 6 0 2025 10 19 09.0 10.50 34260.37500 34260.43750 3.000 15 0 2025 10 19 12.0 13.50 34260.50000 34260.56250 3.000 15 0 2025 10 19 15.0 16.50 34260.62500 34260.68750 3.333 18 0 2025 10 19 18.0 19.50 34260.75000 34260.81250 2.667 12 0 2025 10 19 21.0 22.50 34260.87500 34260.93750 3.000 15 0 2025 10 20 00.0 01.50 34261.00000 34261.06250 2.667 12 0 2025 10 20 03.0 04.50 34261.12500 34261.18750 2.667 12 0 2025 10 20 06.0 07.50 34261.25000 34261.31250 2.333 9 0 2025 10 20 09.0 10.50 34261.37500 34261.43750 1.333 5 0 2025 10 20 12.0 13.50 34261.50000 34261.56250 1.667 6 0 2025 10 20 15.0 16.50 34261.62500 34261.68750 0.667 3 0 2025 10 20 18.0 19.50 34261.75000 34261.81250 1.333 5 0 2025 10 20 21.0 22.50 34261.87500 34261.93750 2.000 7 0 2025 10 21 00.0 01.50 34262.00000 34262.06250 3.000 15 0 2025 10 21 03.0 04.50 34262.12500 34262.18750 3.000 15 0 2025 10 21 06.0 07.50 34262.25000 34262.31250 1.667 6 0 2025 10 21 09.0 10.50 34262.37500 34262.43750 0.333 2 0 2025 10 21 12.0 13.50 34262.50000 34262.56250 0.667 3 0 2025 10 21 15.0 16.50 34262.62500 34262.68750 1.667 6 0 2025 10 21 18.0 19.50 34262.75000 34262.81250 2.333 9 0 2025 10 21 21.0 22.50 34262.87500 34262.93750 2.667 12 0 2025 10 22 00.0 01.50 34263.00000 34263.06250 0.333 2 0 2025 10 22 03.0 04.50 34263.12500 34263.18750 0.667 3 0 2025 10 22 06.0 07.50 34263.25000 34263.31250 0.667 3 0 2025 10 22 09.0 10.50 34263.37500 34263.43750 0.667 3 0 2025 10 22 12.0 13.50 34263.50000 34263.56250 0.667 3 0 2025 10 22 15.0 16.50 34263.62500 34263.68750 0.667 3 0 2025 10 22 18.0 19.50 34263.75000 34263.81250 1.000 4 0 2025 10 22 21.0 22.50 34263.87500 34263.93750 1.333 5 0 2025 10 23 00.0 01.50 34264.00000 34264.06250 2.000 7 0 2025 10 23 03.0 04.50 34264.12500 34264.18750 1.000 4 0 2025 10 23 06.0 07.50 34264.25000 34264.31250 0.000 0 0 2025 10 23 09.0 10.50 34264.37500 34264.43750 1.333 5 0 2025 10 23 12.0 13.50 34264.50000 34264.56250 1.000 4 0 2025 10 23 15.0 16.50 34264.62500 34264.68750 1.000 4 0 2025 10 23 18.0 19.50 34264.75000 34264.81250 2.000 7 0 2025 10 23 21.0 22.50 34264.87500 34264.93750 2.333 9 0 2025 10 24 00.0 01.50 34265.00000 34265.06250 2.667 12 0 2025 10 24 03.0 04.50 34265.12500 34265.18750 2.333 9 0 2025 10 24 06.0 07.50 34265.25000 34265.31250 2.333 9 0 2025 10 24 09.0 10.50 34265.37500 34265.43750 2.333 9 0 2025 10 24 12.0 13.50 34265.50000 34265.56250 1.667 6 0 2025 10 24 15.0 16.50 34265.62500 34265.68750 2.000 7 0 2025 10 24 18.0 19.50 34265.75000 34265.81250 2.667 12 0 2025 10 24 21.0 22.50 34265.87500 34265.93750 1.333 5 0 2025 10 25 00.0 01.50 34266.00000 34266.06250 2.667 12 0 2025 10 25 03.0 04.50 34266.12500 34266.18750 3.333 18 0 2025 10 25 06.0 07.50 34266.25000 34266.31250 2.667 12 0 2025 10 25 09.0 10.50 34266.37500 34266.43750 2.000 7 0 2025 10 25 12.0 13.50 34266.50000 34266.56250 1.667 6 0 2025 10 25 15.0 16.50 34266.62500 34266.68750 0.333 2 0 2025 10 25 18.0 19.50 34266.75000 34266.81250 0.000 0 0 2025 10 25 21.0 22.50 34266.87500 34266.93750 0.333 2 0 2025 10 26 00.0 01.50 34267.00000 34267.06250 1.000 4 0 2025 10 26 03.0 04.50 34267.12500 34267.18750 1.000 4 0 2025 10 26 06.0 07.50 34267.25000 34267.31250 1.333 5 0 2025 10 26 09.0 10.50 34267.37500 34267.43750 1.333 5 0 2025 10 26 12.0 13.50 34267.50000 34267.56250 0.000 0 0 2025 10 26 15.0 16.50 34267.62500 34267.68750 0.667 3 0 2025 10 26 18.0 19.50 34267.75000 34267.81250 0.000 0 0 2025 10 26 21.0 22.50 34267.87500 34267.93750 0.667 3 0 2025 10 27 00.0 01.50 34268.00000 34268.06250 0.667 3 0 2025 10 27 03.0 04.50 34268.12500 34268.18750 0.333 2 0 2025 10 27 06.0 07.50 34268.25000 34268.31250 0.667 3 0 2025 10 27 09.0 10.50 34268.37500 34268.43750 1.000 4 0 2025 10 27 12.0 13.50 34268.50000 34268.56250 0.333 2 0 2025 10 27 15.0 16.50 34268.62500 34268.68750 1.667 6 0 2025 10 27 18.0 19.50 34268.75000 34268.81250 2.000 7 0 2025 10 27 21.0 22.50 34268.87500 34268.93750 3.000 15 0 2025 10 28 00.0 01.50 34269.00000 34269.06250 3.333 18 0 2025 10 28 03.0 04.50 34269.12500 34269.18750 3.667 22 0 2025 10 28 06.0 07.50 34269.25000 34269.31250 3.333 18 0 2025 10 28 09.0 10.50 34269.37500 34269.43750 2.000 7 0 2025 10 28 12.0 13.50 34269.50000 34269.56250 3.667 22 0 2025 10 28 15.0 16.50 34269.62500 34269.68750 3.000 15 0 2025 10 28 18.0 19.50 34269.75000 34269.81250 4.333 32 0 2025 10 28 21.0 22.50 34269.87500 34269.93750 3.667 22 0 2025 10 29 00.0 01.50 34270.00000 34270.06250 2.667 12 0 2025 10 29 03.0 04.50 34270.12500 34270.18750 2.667 12 0 2025 10 29 06.0 07.50 34270.25000 34270.31250 3.667 22 0 2025 10 29 09.0 10.50 34270.37500 34270.43750 3.333 18 0 2025 10 29 12.0 13.50 34270.50000 34270.56250 3.000 15 0 2025 10 29 15.0 16.50 34270.62500 34270.68750 3.667 22 0 2025 10 29 18.0 19.50 34270.75000 34270.81250 4.333 32 0 2025 10 29 21.0 22.50 34270.87500 34270.93750 4.667 39 0 2025 10 30 00.0 01.50 34271.00000 34271.06250 4.333 32 0 2025 10 30 03.0 04.50 34271.12500 34271.18750 3.667 22 0 2025 10 30 06.0 07.50 34271.25000 34271.31250 3.667 22 0 2025 10 30 09.0 10.50 34271.37500 34271.43750 5.333 56 0 2025 10 30 12.0 13.50 34271.50000 34271.56250 5.333 56 0 2025 10 30 15.0 16.50 34271.62500 34271.68750 4.333 32 0 2025 10 30 18.0 19.50 34271.75000 34271.81250 3.333 18 0 2025 10 30 21.0 22.50 34271.87500 34271.93750 5.000 48 0 2025 10 31 00.0 01.50 34272.00000 34272.06250 4.667 39 0 2025 10 31 03.0 04.50 34272.12500 34272.18750 4.667 39 0 2025 10 31 06.0 07.50 34272.25000 34272.31250 4.333 32 0 2025 10 31 09.0 10.50 34272.37500 34272.43750 3.333 18 0 2025 10 31 12.0 13.50 34272.50000 34272.56250 4.000 27 0 2025 10 31 15.0 16.50 34272.62500 34272.68750 3.333 18 0 2025 10 31 18.0 19.50 34272.75000 34272.81250 2.667 12 0 2025 10 31 21.0 22.50 34272.87500 34272.93750 2.667 12 0 2025 11 01 00.0 01.50 34273.00000 34273.06250 2.667 12 0 2025 11 01 03.0 04.50 34273.12500 34273.18750 3.333 18 0 2025 11 01 06.0 07.50 34273.25000 34273.31250 2.667 12 0 2025 11 01 09.0 10.50 34273.37500 34273.43750 2.333 9 0 2025 11 01 12.0 13.50 34273.50000 34273.56250 2.000 7 0 2025 11 01 15.0 16.50 34273.62500 34273.68750 2.667 12 0 2025 11 01 18.0 19.50 34273.75000 34273.81250 3.000 15 0 2025 11 01 21.0 22.50 34273.87500 34273.93750 2.333 9 0 2025 11 02 00.0 01.50 34274.00000 34274.06250 4.333 32 0 2025 11 02 03.0 04.50 34274.12500 34274.18750 3.667 22 0 2025 11 02 06.0 07.50 34274.25000 34274.31250 2.667 12 0 2025 11 02 09.0 10.50 34274.37500 34274.43750 2.667 12 0 2025 11 02 12.0 13.50 34274.50000 34274.56250 2.000 7 0 2025 11 02 15.0 16.50 34274.62500 34274.68750 4.000 27 0 2025 11 02 18.0 19.50 34274.75000 34274.81250 2.667 12 0 2025 11 02 21.0 22.50 34274.87500 34274.93750 3.000 15 0 2025 11 03 00.0 01.50 34275.00000 34275.06250 3.000 15 0 2025 11 03 03.0 04.50 34275.12500 34275.18750 3.333 18 0 2025 11 03 06.0 07.50 34275.25000 34275.31250 4.000 27 0 2025 11 03 09.0 10.50 34275.37500 34275.43750 3.667 22 0 2025 11 03 12.0 13.50 34275.50000 34275.56250 3.333 18 0 2025 11 03 15.0 16.50 34275.62500 34275.68750 3.333 18 0 2025 11 03 18.0 19.50 34275.75000 34275.81250 3.333 18 0 2025 11 03 21.0 22.50 34275.87500 34275.93750 3.333 18 0 2025 11 04 00.0 01.50 34276.00000 34276.06250 3.000 15 0 2025 11 04 03.0 04.50 34276.12500 34276.18750 2.667 12 0 2025 11 04 06.0 07.50 34276.25000 34276.31250 2.000 7 0 2025 11 04 09.0 10.50 34276.37500 34276.43750 2.667 12 0 2025 11 04 12.0 13.50 34276.50000 34276.56250 1.667 6 0 2025 11 04 15.0 16.50 34276.62500 34276.68750 2.000 7 0 2025 11 04 18.0 19.50 34276.75000 34276.81250 1.667 6 0 2025 11 04 21.0 22.50 34276.87500 34276.93750 2.000 7 0 2025 11 05 00.0 01.50 34277.00000 34277.06250 4.000 27 0 2025 11 05 03.0 04.50 34277.12500 34277.18750 3.333 18 0 2025 11 05 06.0 07.50 34277.25000 34277.31250 4.000 27 0 2025 11 05 09.0 10.50 34277.37500 34277.43750 2.333 9 0 2025 11 05 12.0 13.50 34277.50000 34277.56250 1.667 6 0 2025 11 05 15.0 16.50 34277.62500 34277.68750 2.333 9 0 2025 11 05 18.0 19.50 34277.75000 34277.81250 4.333 32 0 2025 11 05 21.0 22.50 34277.87500 34277.93750 5.667 67 0 2025 11 06 00.0 01.50 34278.00000 34278.06250 5.333 56 0 2025 11 06 03.0 04.50 34278.12500 34278.18750 7.000 132 0 2025 11 06 06.0 07.50 34278.25000 34278.31250 6.000 80 0 2025 11 06 09.0 10.50 34278.37500 34278.43750 3.667 22 0 2025 11 06 12.0 13.50 34278.50000 34278.56250 2.333 9 0 2025 11 06 15.0 16.50 34278.62500 34278.68750 3.000 15 0 2025 11 06 18.0 19.50 34278.75000 34278.81250 4.000 27 0 2025 11 06 21.0 22.50 34278.87500 34278.93750 4.333 32 0 2025 11 07 00.0 01.50 34279.00000 34279.06250 5.333 56 0 2025 11 07 03.0 04.50 34279.12500 34279.18750 5.667 67 0 2025 11 07 06.0 07.50 34279.25000 34279.31250 5.000 48 0 2025 11 07 09.0 10.50 34279.37500 34279.43750 4.000 27 0 2025 11 07 12.0 13.50 34279.50000 34279.56250 3.000 15 0 2025 11 07 15.0 16.50 34279.62500 34279.68750 3.000 15 0 2025 11 07 18.0 19.50 34279.75000 34279.81250 3.333 18 0 2025 11 07 21.0 22.50 34279.87500 34279.93750 3.333 18 0 2025 11 08 00.0 01.50 34280.00000 34280.06250 6.000 80 0 2025 11 08 03.0 04.50 34280.12500 34280.18750 5.333 56 0 2025 11 08 06.0 07.50 34280.25000 34280.31250 5.667 67 0 2025 11 08 09.0 10.50 34280.37500 34280.43750 3.667 22 0 2025 11 08 12.0 13.50 34280.50000 34280.56250 3.333 18 0 2025 11 08 15.0 16.50 34280.62500 34280.68750 3.333 18 0 2025 11 08 18.0 19.50 34280.75000 34280.81250 2.667 12 0 2025 11 08 21.0 22.50 34280.87500 34280.93750 1.667 6 0 2025 11 09 00.0 01.50 34281.00000 34281.06250 1.667 6 0 2025 11 09 03.0 04.50 34281.12500 34281.18750 1.333 5 0 2025 11 09 06.0 07.50 34281.25000 34281.31250 2.333 9 0 2025 11 09 09.0 10.50 34281.37500 34281.43750 1.000 4 0 2025 11 09 12.0 13.50 34281.50000 34281.56250 1.333 5 0 2025 11 09 15.0 16.50 34281.62500 34281.68750 0.667 3 0 2025 11 09 18.0 19.50 34281.75000 34281.81250 1.000 4 0 2025 11 09 21.0 22.50 34281.87500 34281.93750 3.000 15 0 2025 11 10 00.0 01.50 34282.00000 34282.06250 2.667 12 0 2025 11 10 03.0 04.50 34282.12500 34282.18750 2.000 7 0 2025 11 10 06.0 07.50 34282.25000 34282.31250 1.000 4 0 2025 11 10 09.0 10.50 34282.37500 34282.43750 2.000 7 0 2025 11 10 12.0 13.50 34282.50000 34282.56250 3.000 15 0 2025 11 10 15.0 16.50 34282.62500 34282.68750 4.000 27 0 2025 11 10 18.0 19.50 34282.75000 34282.81250 3.000 15 0 2025 11 10 21.0 22.50 34282.87500 34282.93750 3.333 18 0 2025 11 11 00.0 01.50 34283.00000 34283.06250 1.667 6 0 2025 11 11 03.0 04.50 34283.12500 34283.18750 2.333 9 0 2025 11 11 06.0 07.50 34283.25000 34283.31250 1.333 5 0 2025 11 11 09.0 10.50 34283.37500 34283.43750 2.000 7 0 2025 11 11 12.0 13.50 34283.50000 34283.56250 0.333 2 0 2025 11 11 15.0 16.50 34283.62500 34283.68750 0.667 3 0 2025 11 11 18.0 19.50 34283.75000 34283.81250 0.333 2 0 2025 11 11 21.0 22.50 34283.87500 34283.93750 2.667 12 0 2025 11 12 00.0 01.50 34284.00000 34284.06250 8.667 300 0 2025 11 12 03.0 04.50 34284.12500 34284.18750 8.333 236 0 2025 11 12 06.0 07.50 34284.25000 34284.31250 7.333 154 0 2025 11 12 09.0 10.50 34284.37500 34284.43750 7.667 179 0 2025 11 12 12.0 13.50 34284.50000 34284.56250 5.667 67 0 2025 11 12 15.0 16.50 34284.62500 34284.68750 4.333 32 0 2025 11 12 18.0 19.50 34284.75000 34284.81250 5.667 67 0 2025 11 12 21.0 22.50 34284.87500 34284.93750 4.000 27 0 2025 11 13 00.0 01.50 34285.00000 34285.06250 6.667 111 0 2025 11 13 03.0 04.50 34285.12500 34285.18750 7.333 154 0 2025 11 13 06.0 07.50 34285.25000 34285.31250 6.333 94 0 2025 11 13 09.0 10.50 34285.37500 34285.43750 3.667 22 0 2025 11 13 12.0 13.50 34285.50000 34285.56250 4.667 39 0 2025 11 13 15.0 16.50 34285.62500 34285.68750 3.333 18 0 2025 11 13 18.0 19.50 34285.75000 34285.81250 2.667 12 0 2025 11 13 21.0 22.50 34285.87500 34285.93750 1.000 4 0 2025 11 14 00.0 01.50 34286.00000 34286.06250 1.000 4 0 2025 11 14 03.0 04.50 34286.12500 34286.18750 0.333 2 0 2025 11 14 06.0 07.50 34286.25000 34286.31250 0.667 3 0 2025 11 14 09.0 10.50 34286.37500 34286.43750 1.333 5 0 2025 11 14 12.0 13.50 34286.50000 34286.56250 1.000 4 0 2025 11 14 15.0 16.50 34286.62500 34286.68750 1.000 4 0 2025 11 14 18.0 19.50 34286.75000 34286.81250 0.333 2 0 2025 11 14 21.0 22.50 34286.87500 34286.93750 0.000 0 0 2025 11 15 00.0 01.50 34287.00000 34287.06250 1.333 5 0 2025 11 15 03.0 04.50 34287.12500 34287.18750 1.000 4 0 2025 11 15 06.0 07.50 34287.25000 34287.31250 2.000 7 0 2025 11 15 09.0 10.50 34287.37500 34287.43750 2.000 7 0 2025 11 15 12.0 13.50 34287.50000 34287.56250 1.667 6 0 2025 11 15 15.0 16.50 34287.62500 34287.68750 -1.000 -1 0 2025 11 15 18.0 19.50 34287.75000 34287.81250 -1.000 -1 0 2025 11 15 21.0 22.50 34287.87500 34287.93750 -1.000 -1 0