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首页> 外文期刊>Chinese Journal of Astronomy and Astrophysics >Derivation of the Spiral Motion of an Eruptive Prominence and Its Explanation
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Derivation of the Spiral Motion of an Eruptive Prominence and Its Explanation

机译：喷发螺旋运动的推导及其解释

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摘要

A 2D velocity field of the eruptive prominence (EP) of 1991 March 5 is obtained from its spectral data observed at the Yunnan Observatory and the velocity distributions along the entrance slit are derived for different observing frames. Under the assumption that matter in the EP undergoes axial, radial and possible rotational motions, we construct a theoretical velocity distribution of the EP along the entrance slit, to derive, by fitting, the angular velocity of rotation ω and the other three parameters (axial velocity υ_0, radial velocity υ_r and the angle between the EP plane and the line of sight φ). We found: an averaged angular velocity ω of 3.0 x 10~(-3) arc s~(-1) and the variation of ω with the height above the solar limb. As the EP rises, the matter within it in fact moves along a spiral path around its axis. The spiral motion may be explained by the theory of plasma 'double pole diffusion' (DPD) caused by a sharp density gradient between the eruptive prominence and the surrounding corona. A theoretical angular velocity ω′ is estimated based on the DPD and basically coincides with ω obtained from the optimal velocity fitting.
机译：从1991年3月5日的一次喷发隆起（EP）二维速度场，从云南天文台观测到的光谱数据中得到，并推导了沿不同观测框架沿入口缝的速度分布。在EP中物质经历轴向，径向和可能的旋转运动的假设下，我们构造EP沿入口狭缝的理论速度分布，以通过拟合得出旋转角速度ω和其他三个参数（轴向速度υ_0，径向速度υ_r以及EP平面和视线之间的夹角φ）。我们发现：平均角速度ω为3.0 x 10〜（-3）arc s〜（-1），ω随太阳肢体上方高度的变化。随着EP的升高，其内部的物质实际上沿其轴线沿螺旋路径运动。螺旋运动可以用等离子体“双极扩散”（DPD）理论来解释，该理论是由喷发隆起与周围电晕之间的急剧密度梯度引起的。理论角速度ω'是基于DPD估算的，基本上与从最佳速度拟合获得的ω一致。

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