Fig. 1From: Discrepant responses of the global electron content to the solar cycle and solar rotation variations of EUV irradianceTime series (left) and Lomb-Scargle periodograms (right) of GEC and EUV. a and c are the results for 365-day running averaged GEC and EUV, and b and d are the results for 27-day average residual GEC and EUV. GEC and EUV are in units of 1032 electrons and 1010 photons/cm2/s, respectivelyBack to article page