On the Influence of the Data Sampling Interval on Computer-Derived K-Indices

  title={On the Influence of the Data Sampling Interval on Computer-Derived K-Indices},
  author={Armelle Bernard and Michel Menvielle and Aude Chambodut},
  journal={Data Sci. J.},
The K index was devised by Bartels et al. (1939) to provide an objective monitoring of irregular geomagnetic activity. The K index was then routinely used to monitor the magnetic activity at permanent magnetic observatories as well as at temporary stations. The increasing number of digital and sometimes unmanned observatories and the creation of INTERMAGNET put the question of computer production of K at the centre of the debate. Four algorithms were selected during the Vienna meeting (1991… 
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