Fig. 5
Monthly mean polar IR variations at a) 171 Å, b) 304 Å and c) 17 GHz. For comparison the monthly sunspot numbers for each hemisphere were plotted in panel d). The daily south (red curves) and north (blue curves) means IR were calculated in the regions 60−120° and 240−300°, respectively.Yearly running means (12 points) were applied to the values (thick lines).
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