“…The Lockwood et al study reinvigorated the field of long‐term solar variability. After ~15 years of lively research based on sunspot data [e.g., Solanki et al ., , ; Wang et al ., ; Tapping et al ., ; Balmaceda et al ., ; Schwadron et al ., ; Vieira and Solanki , ; Vieira et al ., ; Owens and Lockwood , ; Clette et al ., ; Lockwood and Owens , ; Lockwood et al ., ; Yeo et al ., ; Clette and Lefèvre , ; Svalgaard and Schatten , ; Usoskin et al ., ] and the geomagnetic activity record [e.g., Svalgaard et al ., ; Mursula et al ., ; Svalgaard et al ., ; Svalgaard and Cliver , ; Lockwood et al ., ; Mursula and Martini , ; Svalgaard and Cliver , ; Rouillard et al ., ; Svalgaard and Cliver , ; Lockwood et al ., ; Svalgaard and Cliver , ; Lockwood and Owens , ; Lockwood et al ., , , , ; Svalgaard , ], an emerging consensus on the reconstruction of B based on geomagnetic data has been forged for the last century [ Svalgaard and Cliver , ; Lockwood and Owens , ]. As noted by Lockwood and Owens [], “This is a significant development because individually, each [method] has uncertainties introduced by instrument calibration drifts, limited numbers of observatories, and the strength of the correlations employed.”…”