|Available||from 1932 onwards|
|Type of index||K-derived planetary|
|Purpose||To characterize the intensity of geomagnetic activity on a planetary scale (however because of the historical context at the time of its creation, the Kp network is heavily weighted towards Europe and Northern America).|
|Network||Made of 11 northern and 2 southern stations between 44° and 60° northern or southern geomagnetic latitude.
(see list of actual and previous Kp magnetic observatories)
|Derivation||Kp is the arithmetic mean of the 3-hour standardized K-indices for the 13 Kp-observatories.
The standardization is achieved using standardization tables (*) for each observatory that were defined by Bartels (1949). They aim at removing the UT and seasonal variations in the geomagnetic disturbances.
(*) More specific and detailed information may be found on the GFZ website devoted to Kp and related geomagnetic indices.
|ISGI Collaborating Institute||GFZ Potsdam, Germany|
|IAGA endorsed||IATME Bulletin 14, 1954, p. 368, resolution 6 and p.229|
|Related geomagnetic indices
(enclosed in main index downloaded file)
|Citation||Matzka, J., O. Bronkalla, K. Tornow, K. Elger and C. Stolle (2021) - Geomagnetic Kp index. V. 1.0, GFZ Data Services, DOI:10.5880/Kp.0001|
• Bartels, J. (1949) - The standardized index Ks and the planetary index Kp, IATME Bulletin 12b, 97.
• Bartels, J. and J. Veldkamp (1954) - International data on magnetic disturbances, fourth quarter, 1953, J. Geophys. Res., 59, 297-302, DOI:10.1029/JZ059i002p00297.
• Bartels, J. (1957) - The technique of scaling indices K and Q of geomagnetic activity, Ann. Intern. Geophys. Year 4, 215-226. Get PDF (672.2KB)
• Bartels, J. (1957) - The geomagnetic measures for the time-variations of solar corpuscular radiation, described for use in correlation studies in other geophysical fields, Ann. Intern. Geophys. Year 4, 227-236. Get PDF (576.8KB)