太阳旋转动能的时间变化
Temporal Variations in the Sun's Rotational Kinetic Energy
摘要：
目的：研究太阳角动量和旋转动能的变化，以及引力多极矩在太阳周期时间尺度上的相关变化。实验方法：由全球振荡网络小组和太阳和日光层观测站上的迈克尔逊多普勒成像仪获得的日震旋转分裂数据的反演。研究结果：在高纬度地区（>π/4），角动量和动能的时间变化与太阳活动呈正相关，而在低纬度地区，角动量和动能的时间变化与太阳活动呈负相关，除了按半径计算的前10%区域外，这两个区域都呈正相关。结论：日震数据意味着显着的时间变化的角动量和旋转动能，并在重力多极矩。这种变化的性质将有助于限制太阳周期的动力学理论。
英文摘要：
AIM: To study the variation of the angular momentum and the rotational kinetic energy of the Sun, and associated variations in the gravitational multipole moments, on a timescale of the solar cycle. METHOD: Inverting helioseismic rotational splitting data obtained by the Global Oscillation Network Group and by the Michelson Doppler Imager on the Solar and Heliospheric Observatory. RESULTS: The temporal variation in angular momentum and kinetic energy at high latitudes (>π/4) through the convection zone is positively correlated with solar activity, whereas at low latitudes it is anticorrelated, except for the top 10% by radius where both are correlated positively. CONCLUSION: The helioseismic data imply significant temporal variation in the angular momentum and the rotational kinetic energy, and in the gravitational multipole moments. The properties of that variation will help constrain dynamical theories of the solar cycle.
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