Image Details
Caption: Figure 7.
Annual values of the standardized fractional solar disk coverage by sunspots ﹩{\hat{\alpha }}_{s}﹩ (dotted black line) and standardized potential ﹩\hat{{\rm{\Phi }}}﹩ (continuous red line). The sunspot signal has been reconstructed until 1873, while more recent values are recorded (Mandal et al. 2020).
© 2022. The Author(s). Published by the American Astronomical Society.