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t = t0 <br />
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F <br />
S r = rS <br />
<br />
1 ∂F<br />
N ∂t = µ(∆θϕF − ∆θϕF∞) − α(F − F∞). <br />
µ α <br />
F∞ <br />
F <br />
S N = N0 ∈ R + <br />
∞ ℓ<br />
F0 =<br />
F0ℓmY m<br />
ℓ (θ, ϕ). t = t0 <br />
ℓ=0 m=−ℓ<br />
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∀(t ≥ t0), ∀(ℓ, m), Fℓm(t) = F∞ℓm + (F0ℓm − F∞ℓm)e −N(α+µℓ(ℓ+1))(t−t0) . <br />
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α µ