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arXiv 1010.0409astro-ph.SR
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用正演模拟反演日冕物质抛射的真实运动学性质

The Inversion of the Real Kinematic Properties of Coronal Mass Ejections by Forward Modeling

Y. Wu, P. F. Chen

摘要:

日冕物质抛射(CME)的运动学特性受投影效应的影响,其实际速度应大于视速度,实际角宽度应小于视速度。人们曾多次尝试修正投影效应,但由于对CME事件的选择有偏差,导致了过大的平均速度。为了估计的整体影响的投影效应的CME的运动学特性,我们执行的CME属性,如速度,角宽度和纬度的真实分布的正演模拟,通过要求他们的投影分布,以最好地匹配的观测。这种匹配是通过蒙特卡罗模拟进行的。结果表明:(1)非全晕日冕物质抛射的平均真速度约为514 km s $^{-1}$,平均真角宽约为33 $^\circ$,而观测值为418 km s $^{-1}$和42.7 $^\circ$;(2)角宽在$20^\circ- 120^\circ$范围内的日冕物质抛射的平均实速度为510 km s $^{-1}$,平均实角宽为43.4 $^\circ$,与观测中相应的392 km s $^{-1}$和52 $^\circ$的视值相反。

英文摘要:

The kinematic properties of coronal mass ejections (CMEs) suffer from the projection effects, and it is expected that the real velocity should be larger and the real angular width should be smaller than the apparent values. Several attempts have been tried to correct the projection effects, which however led to a too large average velocity probably due to the biased choice of the CME events. In order to estimate the overall influence of the projection effects on the kinematic properties of the CMEs, we perform a forward modeling of the real distributions of the CME properties, such as the velocity, the angular width, and the latitude, by requiring their projected distributions to best match the observations. Such a matching is conducted by Monte Carlo simulations. According to the derived real distributions, it is found that (1) the average real velocity of all non-full-halo CMEs is about 514 km s$^{-1}$, and the average real angular width is about 33$^\circ$, in contrast to the corresponding apparent values of 418 km s$^{-1}$ and 42.7$^\circ$ in observations; (2) For the CMEs with the angular width in the range of $20^\circ- 120^\circ$, the average real velocity is 510 km s$^{-1}$ and the average real angular width is 43.4$^\circ$, in contrast to the corresponding apparent values of 392 km s$^{-1}$ and 52$^\circ$ in observations.

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