Articles | Volume 9, issue 1
Geosci. Instrum. Method. Data Syst., 9, 105–115, 2020
Geosci. Instrum. Method. Data Syst., 9, 105–115, 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

Bartels, J.: The standardized index, Ks, and the planetary index, Kp, Int. Union Geod. Geophys. IATME Bull., 12, 97 pp., 1949. 
Bartels, J., Heck, N. H., and Johnston, H. F.: The three-hour-range index measuring geomagnetic activity, Terr. Magn. Atmos. Elec., 44, 411–454,, 1939. 
Chambodut, A., Marchaudon, A., Menvielle, M., ElLemdani, F., and Lathuillere, C.: The K-derived MLT sector geomagnetic indices, Geophys. Res. Lett., 40, 4808–4812,, 2013. 
Chiappini, M., Meloni, A., Boschi, E., Faggioni, O., Beverini, N., Carmisciano, C., and Marson, I.: Shaded relief magnetic anomaly map of Italy and surrounding marine areas, Ann. Geophys., 43, 983–989,, 2000. 
Coles, R. and Menvielle, M.: Some thoughts concerning new digital magnetic indices, Geophys. Trans., 36, 303–312, 1991. 
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.