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?

作　　者：熊大闰[1] 邓李才[2] 

机构地区：[1]中国科学院紫金山天文台,南京210008 [2]中国科学院国家天文台,北京100012

出　　处：《天文学报》2012年第6期500-506,共7页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(11073053;10973015)资助

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(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.

关 键 词：太阳 振荡 对流 

分 类 号：P182[天文地球—天文学]