太阳存在脉动不稳定的低球谐阶p1模吗?

Are There the Unstable Low-degree P1 modes in the Sun?

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(l<25)模的非绝热脉动.结果表明,低阶(0<l<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5 min振荡的激发机制有重要意义.

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.