Fig. 4
Same as Fig. 1, but for the temporal variations in μHz of the frequency shifts (from top to bottom) ⟨ Δνn,l = 0 ⟩, ⟨ Δνn,l = 1 ⟩, ⟨ Δνn,l = 2 ⟩, at each individual angular degree l = 0, 1, and 2 (black dots). The associated 10.7 cm radio flux, F10.7, scaled to match the rising phase and the maximum of Cycle 23 is shown as a proxy of the solar surface activity (solid line).
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