X9

where A is in pm, the coefficients A and B are tabulated in Allen (1976) for various molecules, while S = (6 + 3A)/(6 — 7A), where A is the depolarization factor, whose values are given in Table 6.2, together with the coefficients A and B for various molecules.

For a mixture of atmospheric gases we obtain the rayleigh cross-section from or = ORm nm (6.70)

m where nm is the mixing ratio by volume, of molecules m.

The rayleigh reflectivity of an atmospheric layer can be quickly estimated using the two-stream approximation (§3.5.7) from

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