ABSTRACT

Waves in the Sun’s atmosphere play a very important role in the redistribution of energy and momentum. This motivates to search for new types of wave motions that could be realized in the solar atmosphere. The main focus is traditionally given to freely propagating waves, which transfer energy outwards. However, after the discovery of the f-mode, it became clear that an important role in the dynamics of the atmosphere can be played by horizontally propagating and vertically evanescent wave modes. We here proposed a new approach to describing these waves in an isothermal stratified atmosphere. It is based on the use of a constraint on the solution of the equations of hydrodynamics, which: (1) selects only evanescent modes; (2) excludes the solutions with singularities in the polarization relations. As a result, a family of solutions for evanescent waves is obtained and analysed, parametrized by some real value and continuously filling the region of the diagnostic diagram between the regions of freely propagating acoustic and gravity waves. It is shown that the known evanescent modes, in particular the f-mode, for certain values of the parameter also belong to the family that we found. The results of this work can be used to interpret the observed features of waves in the atmosphere of the Sun and planets.

中文翻译：

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等温气氛中e逝声重力波的连续谱

摘要

太阳大气中的波浪在能量和动量的重新分配中起着非常重要的作用。这激发了寻找可以在太阳大气中实现的新型波动的动力。传统上，主要焦点是自由传播的波，这些波向外传播能量。但是，在发现f之后-模式，显然可以通过水平传播和垂直e逝波模式在大气动力学中发挥重要作用。在这里，我们提出了一种在等温分层大气中描述这些波的新方法。它基于对流体动力学方程解的约束条件的使用，其中：（1）仅选择渐逝模式；（2）排除极化关系中具有奇异性的解。结果，获得并分析了van逝波的解决方案系列，并通过一些实际值对其进行了参数化，并连续填充了诊断图的自由传播声波和重力波区域之间的区域。结果表明，已知的渐逝模式，特别是f-mode，因为该参数的某些值也属于我们找到的族。这项工作的结果可用于解释在太阳和行星大气中观察到的波的特征。