EARTH SCIENCE > SUN-EARTH INTERACTIONS > IONOSPHERE/MAGNETOSPHERE DYNAMICS > GEOMAGNETIC INDICES
Geomagnetic indices are an indicator of geomagntic activity caused by solar
events. Typical geomagntic indices are: a, A, Ap, Dst, K, and Kp. The
for example, is a daily average composed of 3-hour data points. Geomagnetic
indices can be used in conjunction with solar"wind" data to predict the onset
and intensity of geomagnetic storms.
NOAA/NGDC Solar-Terrestrial Glossary: