Next is the radiative zone, which extends from the core to 70 percent of the way to the sun's surface, making up 32 percent of the sun's volume and 48 percent of its mass.

接下来是辐射区，其范围从核心表面到太阳半径的70%处，占太阳总体积的32%，总质量的48%。

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The direct exchanging area is essential for zone method to calculate radiative heat transfer.

直接交换面积是区域法计算辐射传热的基础数据。

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Compared with zone method and heat flux method, imaginary plane method is a better way to calculate the radiative heat transfer.

本文比较了计算辐射传热的三种数值计算方法：区域法、假想面法和热流法，提出了用假想面法进行矮烟罩内辐射传热计算。

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Below the convective zone lies a radiative zone, which is a calmer region, where photons transport the Sun's energy outward.

BBC: Sun, Trace