一维MHD模型中g模谱的Coriolis力修正
Coriolis force corrections to g-mode spectrum in 1D MHD model
摘要：
计算了中心磁场和太阳自转对g模频率的修正。计算是在简单的一维磁流体动力学模型中进行的，所采用的近似方法使人们能够得到超出JWKB近似范围的磁重力波的纯解析谱，并避免在小背景磁场中出现尖点共振，从而使波锁定在辐射区内。这些分析结果进行了比较与卫星观测的g-模式频率的变化，这是百分之一的顺序，在高尔夫实验在SoHO董事会。结果表明，强磁场中的磁频移是主要的贡献，它服从所用的近似。特别地，固定的磁场强度700 KG导致径向阶数n=-10的g模式的频移的上述值。由于科里奥利力引起的转动位移似乎很小，不超过百分之零点几，α_Ω< 0.003。
英文摘要：
The corrections to g-mode frequencies caused by the presence of a central magnetic field and rotation of the Sun are calculated. The calculations are carried out in the simple one dimensional magnetohydrodynamical model using the approximations which allow one to find the purely analytical spectra of magneto-gravity waves beyond the scope of the JWKB approximation and avoid in a small background magnetic field the appearance of the cusp resonance which locks a wave within the radiative zone. These analytic results are compared with the satellite observations of the g-mode frequency shifts which are of the order one per cent as given in the GOLF experiment at the SoHO board. The main contribution turns out to be the magnetic frequency shift in the strong magnetic field which obeys the used approximations. In particular, the fixed magnetic field strength 700 KG results in the mentioned value of the frequency shift for the g-mode of the radial order n=-10. The rotational shift due to the Coriolis force appears to be small and does not exceed a fracton of per cent, α_Ω< 0.003.
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