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(a) Gradients (nT/s) in the horizontal magnetic field measured at Abisko. Negative gradients are plotted in blue line on top of the positive gradients in red. Monthly sunspot numbers (v2.0) on right scale are plotted in magenta line. Times of HV power line disruptions are indicated by the black triangles. (b) and (c) Corresponding plots for gradients in Lövö/Uppsala and Brorfelde magnetic data.
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