Scatter plot of high frequency mode variation of TSI and SIM Hydrogen-α line at 656.3 nm. The slope of the regression line is 0.0011, which is visibly indistinguishable from the 1 to 1000 ratio line. The red lines represent the deviation of the high frequency variation of Hydrogen-α from its regression to TSI when the deviation is equal to ±0.001 W m⁻² nm⁻¹. The red squares denote estimated outliers of SIM/SSI at H-α. These outliers are excluded from the SSI data for EEMD analysis.