The bar plots show the maxima changes in the horizontal magnetic field components in units 0.01 nT/s with 10 min resolution for the last 24 hours. The magnetically quiet hours are marked with blue bars and the disturbed hours with red bars. An hour is considered as disturbed if the value in scale of the plot exceeds 30 in Nurmijärvi, 35 in Hankasalmi, 42 in Oulujärvi, 50 in Sodankylä, 52 in Muonio or 57 in Kevo and Kilpisjärvi.