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Geomagnetic Indices


Geomagnetic activity indices are numeric parameters designed to give global and synthetic information about the perturbations of the Earth’s magnetic field in general, or, more specifically, about peculiar aspects related to these perturbations.
The indices officially adopted by IAGA can be divided into two groups:

  • indices characterising the planetary perturbation level in its whole with no distinction among the different types of perturbation (K index and all derived indices are part of this group),
  • indices designed to describe a precise perturbing phenomenon (Dst and AE are part of this group).

INGV periodically estimates K indices relative to the geomagnetic field recorded at L’Aquila observatory, thus providing a conventional measure of magnetic activity produced by the corpuscular radiation emitted by the Sun.

 

 

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