中文摘要：

利用一种非局部和非定常的恒星对流理论，计算了太阳中低球谐阶（？〈25）模的非绝热脉动．结果表明，低阶（0〈f〈6）非径向p1模是脉动不稳定的，而与之相邻的g模、f模和p2．p5模都是脉动稳定的．根据累积功图的分析，发现振荡的激发来自对流区底部区域．太阳是否存在不稳定的低球谐阶p1模对判断太阳5min振荡的激发机制有重要意义．

英文摘要：

By using a nonlocal time-dependent theory of convection, the nonadiabatic oscillations of the solar lowand intermediate-degree （l 〈 25） modes are calculated. The results show that the nonradial pl modes of l = 1 - 5 are pulsationally unstable. However, the adjacent g, f, p2-p5 modes, and pl modes of l 〉 5 are stable. The analysis of accu- mulated works shows that the excitation of the low-degree pl modes is resulted from the radiation zone beneath the convection zone. Whether the sun has the unstable low-degree pl modes is significant for defining the excitation mechanism of the solar five-minute oscillation.