In this paper, the conditions under which the supersonic radiation transport was diffusive were investigated in the case of an external radiation source with constant temperature.

• 分析得出：对于一个固定的恒温外源，随着时间的增加，热波波头位置是随时间的平方根增长的，光学厚度正比于波头位置，也是随时间而逐渐增加的；