| Derivation of the Spiral Motion of an Eruptive Prominence and Its Explanation |
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| 作者姓名： | Xiao-Ma Gu Shu-Hua Zhong Hong-Fei Liang and La-Sheng Zhan National Astronomical Observatories / Yunnan Observatory Chinese Academy of Sciences Kunming Jingdezhen ceramic institute Jingdezhen |
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| 作者单位： | Xiao-Ma Gu，Shu-Hua Zhong，Hong-Fei Liang and La-Sheng Zhan National Astronomical Observatories / Yunnan Observatory，Chinese Academy of Sciences，Kunming 650011; Jingdezhen ceramic institute，Jingdezhen 333000 |
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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 w and the other three parameters (axial velocityυ0, radial velocityυr and the angle between the EP plane and the line of sightφ). We found: an averaged angular velocityωof 3.0 f6 10-3 arc s-1 and the variation ofωwith 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 velocityω' is estimated based on the DPD and basically coincides withωobtained from the optimal velocity fitting.
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Derivation of the Spiral Motion of an Eruptive Prominence and Its Explanation |
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| Xiao-Ma Gu,Shu-Hua Zhong,Hong-Fei Liang and La-Sheng Zhan National Astronomical Observatories / Yunnan Observatory,Chinese Academy of Sciences,Kunming , Jingdezhen ceramic institute,Jingdezhen .Derivation of the Spiral Motion of an Eruptive Prominence and Its Explanation[J].Chinese Journal of Astronomy and Astrophysics,2006,6(5). |
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| Authors: | Xiao-Ma Gu Shu-Hua Zhong Hong-Fei Liang La-Sheng Zhan |
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| Abstract: | |
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| Keywords: | Sun: eruptive prominence - Sun: Spiral motion |
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