Fig. 1
Evolution of energy in the axisymmetric field (upper curve) and nonaxisymmetric field (lower curve). At dimensionless time 0.6, the steadily oscillating axisymmetric solution (period PE ≈ 0.024) is perturbed by the addition of a nonaxisymmetric part in alpha between times 0.6 and 0.605. The nonaxisymmetric perturbation is then removed, and the nonaxisymmetric field decays.
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