Articles | Volume 9, issue 1
Geosci. Instrum. Method. Data Syst., 9, 105–115, 2020
https://doi.org/10.5194/gi-9-105-2020
Geosci. Instrum. Method. Data Syst., 9, 105–115, 2020
https://doi.org/10.5194/gi-9-105-2020

Research article 03 Apr 2020

Research article | 03 Apr 2020

On the validation of K-index values at Italian geomagnetic observatories

Mauro Regi et al.

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Cited articles

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Bartels, J., Heck, N. H., and Johnston, H. F.: The three-hour-range index measuring geomagnetic activity, Terr. Magn. Atmos. Elec., 44, 411–454, https://doi.org/10.1029/TE044i004p00411, 1939. 
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Short summary
The K index, characterizing local geomagnetic activity, is generally automatically calculated by algorithms such as KASM, one of the four software programs recommended by INTERMAGNET. KASM requires an appropriate L9 value. We analyze K values for Italian observatories and compare them with historical German observatories to establish the best L9 estimation for our stations. A comparison with results from a previous empirical method shows the consistency and reliability of our outcome.