Large-scale photospheric magnetic field: The diffusion of active region fields
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- Schatten, K.H., Leighton, R.B., Howard, R. et al. Sol Phys (1972) 26: 283. doi:10.1007/BF00165269
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The large-scale photospheric magnetic field has been computed by allowing observed active region fields to diffuse and to be sheared by differential rotation in accordance with the Leighton (1969) magnetokinematic model of the solar cycle. The differential rotation of the computed field patterns as determined by autocorrelation curves is similar to that of the observed photospheric field, and poleward of 20° latitude both are significantly different from the differential rotation of the long-lived sunspots (Newton and Nunn, 1951) used as an input into the computations.