Figure 5From: How does ionospheric TEC vary if solar EUV irradiance continuously decreases?The cubic fitted daytime TEC at two solar EUV levels. Left for the EUV level of 0.1- to 50-nm EUV flux equal to 3 (in units of 1014 photons/m2/s), and right for the EUV level of 0.1- to 50-nm EUV flux equal to 1.Back to article page