Real time

Follow the geomagnetic development in real time! (NB! Absolute values are shown in the graphs. The data is not yet processed and may contain man-made signals. Real values in processed data (latest processed data 2025-05-31 23:59:59). Solar quiet curves shows the normal or quiet state for the magnetic field when not disturbed by solar storms. The development of quiet curves from 1978 can be seen here: Quiet curves 1978-).

Kiruna (68°N)

Data from 2020-12-01. Go to Secondary magnetometer (current backup magnetometer) for data from 1990-01-01. To check K index from 1962 go to K index page. More data can be found here.

K-index calculation algorithms:
IH = Ingemar Häggström method
FMI = Finnish Meteorological Institute method

Tormestorp (56°N)

Data from 2018-09-19. Archive.
Log book Tormestorp
See todays graphs here.
Tormestorp magnetometer


Tormestorp magnetometer Lund pages	Kiruna Secondary Magnetometer	Pulsation measurements	Kiruna Primary Magnetometer (Installed in February 2019)	Total field measurements (gsm90 v ? (from 1997))	3d plot magnetic field Kiruna	Lycksele SGU magnetometer Contact SGU regarding Lycksele magnetometer data	ACE magnetometer (data prepared by noaa.gov)

Digital realtime data

Last hour

http://www2.irf.se/maggraphs/rt1hour_secondary.txt gives you data for the last hour with times in hours and the three components (XYZ) in nT as preliminary deflections from the expected monthly mean.
http://www2.irf.se/maggraphs/rt_iaga_last_hour_secondary.txt gives data in iaga format for the last hour in 1 minute resolution. Absolute values are presented based on absolute measurements made until 2025-07-18 11:10:00.
http://www2.irf.se/maggraphs/rt_iaga_last_hour_1sec_secondary.txt gives data in iaga format for the last hour in 1 second resolution. Absolute values are presented based on absolute measurements made until 2025-07-18 11:10:00.
http://www2.irf.se/maggraphs/rt_last_hour_1sec_primary.csv gives data in csv format for the last hour in 1 second resolution from the primary DTU (suspended) magnetometer.
http://www2.irf.se/maggraphs/rt_iaga_last_hour_1min_primary.txt gives data in iaga format for the last hour in 1 minute resolution from the primary DTU (suspended) magnetometer.
http://www2.irf.se/maggraphs/rt_last_hour_1min_primary.csv gives data in csv format for the last hour in 1 minute resolution from the primary DTU (suspended) magnetometer.

Last day

http://www2.irf.se/maggraphs/rt_secondary.txt gives ascii data for the last day in the format "yyyymmddhhmmss X Y Z" in nT as preliminary deflections from the expected monthly mean.
http://www2.irf.se/maggraphs/rt_iaga_secondary.txt gives data in iaga format for the last day. Absolute values are presented based on absolute measurements made until 2025-07-18 11:10:00.
http://www2.irf.se/maggraphs/rt_iaga_1sec_secondary.txt gives data in iaga format for the last day. Absolute values are presented based on absolute measurements made until 2025-07-18 11:10:00.

Preliminary real time K index last three hours [21:00:00-00:00:00 UTC]: 2
(http://www2.irf.se/maggraphs/preliminary_real_time_k_index_secondary)

Log book Kiruna

Constructed by Ingemar Häggström. 5 May 1997
Responsible scientist: Masatoshi Yamauchi (masatoshi.yamauchi*irf.se)
Responsible for web pages: Mats Luspa (matsl*irf.se)