2 Q0

The spin-down time, which is the time required for the fluid to cover this length at the speed of the meridional currents, is therefore equal to

where u is the typical speed of the meridional flow.

In the laboratory problem, by virtue of Eqs. (8.40) and (8.42), one has |u| ^ (S/2L) (Q — Q0)m. Hence, making use of Eq. (8.91), one readily sees that the spin-down time is of the order of (Q05/L)—which is the result obtained in Eq. (8.43). In contrast, in the double-star problem, we have shown that

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