Day-night heat redistribution

Day-night heat redistribution transports absorbed stellar energy from an irradiated hemisphere to a dark hemisphere through atmospheric or oceanic motion. Its efficiency controls the thermal phase-curve amplitude and nightside temperature of a synchronously rotating planet.

Table of contents
- Stellar flux redistribution factor Day-night heat redistribution
- Nightside equilibrium temperature Day-night heat redistribution

Stellar flux redistribution factor ( $f_{r}$ )

This factor converts substellar incident flux into the representative flux used in an atmospheric model. Uniform global averaging gives

f_{r} = 1/4

; dayside averaging gives

1/2

if albedo is treated separately. The convention must be stated when defining an irradiation temperature.

Nightside equilibrium temperature ( $T_{n}$ )

ϵ

of total absorbed stellar power reaches the night side, blackbody balance gives

T_{n} = T_{*} \frac{R _{*}}{a} [\frac{ϵ ( 1 - A _{B} )}{2}]^{1/4} .

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