|Reflection of the Geomagnetic Activity Occurring in the Earth's Northern and Southern
Hemisphere (KM, KN, KS Indices)
|The National Geophysical Data Center receives on a monthly basis, the KM, KN, KS indices
from Institue De Physique Du Globe, Paris, France. These data are available from 1959
to present. The KN and KS are planetary indices which have been derived using data
obtained by northern and southern hemisphere observatories, respectively. KM is mean
value and is usually very close in magnitude to KP. These indices reflect the geomagnetic
activity occurring in the Earth’s northern and southern hemispheres.