Figure 1From: Empirical modeling of the storm time geomagnetic indices: a comparison between the local K and global Kp indicesHermanus K index response to solar storms. This figure indicates the K index level recorded at the Hermanus Magnetic Observatory during an intense magnetic storm on 3 to 5 August 2010. This storm followed a solar CME that erupted on 1 August 2010.Back to article page