Geomagnetic activity indicates large amplitude for sunspot cycle 24

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The Solar Cycle (2007, methodology): “Hathaway and Wilson (2006) used a modification of this method to predict cycle 24.”
Solar Cycle Prediction Using Precursors and Flux Transport Models (2006, background): “…for the selection or division of geomagnetic data during the declining phase of the sunspot cycle into an 'activity-related' and an 'interplanetary' component (Legrand & Simon 1981; Feynman 1982) have also been shown to provide high correlations for past cycles (e.g., Hathaway & Wilson 2006).”
The Solar Cycle (2010, background): “Hathaway et al. (1994) found that good fits to most cycles could be obtained with a fixed value for the parameter c and a parameter b that is allowed to vary with the amplitude – leaving a function of just two parameters (amplitude and starting time) that were well determine early in each cycle.”