Latitudinal Propagation of Thermal Rossby Waves in Stellar Convection Zones

IF 4.8 2区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Rekha Jain, Bradley W. Hindman
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引用次数: 0

Abstract

Abstract Using an analytic model, we derive the eigenfrequencies for thermal Rossby waves that are trapped radially and latitudinally in an isentropically stratified atmosphere. We ignore the star’s curvature and work in an equatorial f-plane geometry. The propagation of inertial waves is found to be sensitive to the relative direction of the wavevector to the zonal direction. Prograde propagating thermal Rossby waves are naturally trapped in the radial direction for frequencies above a critical threshold, which depends on the angle of propagation. Below the threshold frequency, there exists a continuous spectrum of prograde and retrograde inertial waves that are untrapped in an isentropic atmosphere but can be trapped by gradients in the specific entropy density. Finally, we discuss the implications of these waves on recent observations of inertial oscillations in the Sun, as well as in numerical simulations.
热罗斯比波在恒星对流区的纬向传播
摘要利用解析模型,推导了在等熵分层大气中径向和纬向捕获的热罗斯比波的特征频率。我们忽略恒星的曲率,在赤道的f平面几何中工作。发现惯性波的传播对波矢量与纬向的相对方向很敏感。顺行传播的热罗斯比波在超过临界阈值的频率上自然地被捕获在径向上,这取决于传播的角度。在阈值频率以下,存在一个连续的顺行和逆行惯性波谱,这些惯性波在等熵大气中不被捕获,但可以通过比熵密度的梯度被捕获。最后,我们讨论了这些波对最近太阳惯性振荡观测的影响,以及在数值模拟中的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Astrophysical Journal
Astrophysical Journal 地学天文-天文与天体物理
CiteScore
8.40
自引率
30.60%
发文量
2854
审稿时长
1 months
期刊介绍: The Astrophysical Journal is the foremost research journal in the world devoted to recent developments, discoveries, and theories in astronomy and astrophysics.
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