Fig. 6From: The science case for the EISCAT_3D radar Left: Surface air temperature changes in the northern winter hemisphere from model calculation including energetic electron precipitation and NOx production (Rozanov et al. 2005). Right: Difference between surface air temperature for the high Ap (geomagnetic activity index) minus low Ap years from 1957 to 2006 (adapted from Seppälä et al. 2009)Back to article page