Fig. 2From: High-latitude magnetic fields and their time derivatives: interhemispheric similaritiesUpper panel: Average of the daily maximum of the horizontal magnetic field vector (H) at high-latitude stations. Lower panel: Average of the daily maximum of the time derivative of the horizontal magnetic field vector (dH/dt). Open circles: northern hemisphere, filled diamonds: southern hemisphere. Error bars correspond to the standard deviations.Back to article page