Electron Density Modeling of a Streamer Using LASCO Data of 2004 January and February
Electron Density Modeling of a Streamer Using LASCO Data of 2004 January and February
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使用 2004 年 1 月和 2 月 LASCO 数据对流光进行电子密度建模
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
R. Howard
中科院分区：
文献类型：
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作者：
A. Thernisien;R. Howard
我们提出了一个三维重建的电子密度流光使用新发展的正演模拟技术。SOHO LASCO在2004年1月底连续观测到了流光，但在这项研究中，我们考虑了两个日期，大约相隔7天。在第一天看到的流光是“边上”的，其中日冕中性线垂直于日冕边缘，上面的流光相当窄。第二次发生在7天后，当时流光已经在太阳极点上方旋转，现在可以“面对面”看到流光。此时，中性线与极肢平行。利用电子密度反转技术，我们确定了表征流光长度和厚度的密度分布。这些密度分布被用来改进由高斯板近似的流光带的三维模型。我们发现径向分布与以前的流光模型符合得很好，但我们发现在流光结构中电子密度可以变化1个数量级。
We present a three-dimensional reconstruction of the electron density of a streamer using a newly developed forward modeling technique. The streamer was observed by SOHO LASCO continuously at the end of 2004 January, but for this study we consider two dates, about 7 days apart. On the first day the streamer was seen "edge-on," in which the coronal neutral line was perpendicular to the solar limb and the overlying streamer was quite narrow. The second occurred 7 days later, when the streamer had rotated over the solar pole, and the streamer was now seen "face-on." At this time the neutral line was parallel to the polar limb. Using electron density inversion techniques, we have determined the density profiles characterizing the length and thickness of the streamer. Those density profiles were used to refine a three-dimensional model of the streamer belt, approximated by a Gaussian slab. We find good agreement of the radial profile with previous streamer models, but we find that the electron density can vary by 1 order of magnitude within the streamer structure.