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首页> 外文期刊>The Astrophysical Journal. Supplement Series >An Atlas of Coronal Electron Density at 5R(circle dot). II. A Spherical Harmonic Method for Density Reconstruction
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An Atlas of Coronal Electron Density at 5R(circle dot). II. A Spherical Harmonic Method for Density Reconstruction

机译：5R（圆点）处的冠状电子密度的图谱。 II。 密度重建的球形谐波方法

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This is the second of a series of three papers that present a methodology with the aim of creating a set of maps of the coronal density over a period of many years. This paper describes a method for reconstructing the coronal electron density based on spherical harmonics. By assuming a radial structure to the corona at the height of interest, line-of-sight integrations can be made individually on each harmonic basis prior to determining coefficients, i.e., the computationally expensive integrations are calculated only once during initialization. This approach reduces the problem to finding the set of coefficients that best match the observed brightness using a regularized least-squares approach and is very efficient. The method is demonstrated on synthetic data created from both a simple and an intricate coronal density model. The quality of reconstruction is found to be reasonable in the presence of noise and large gaps in the data. The method is applied to both Large Angle and Spectrometric Coronagraph Experiment C2 and Solar Terrestrial Relations Observatory Cor2 coronagraph observations from 2009 March 20, and the results from both spacecraft compared. Future work will apply the method to large data sets.
机译：这是一系列三篇论文的第二个，其目的是在多年的时间内创建一组冠状密度的地图。本文介绍了一种基于球形谐波重建冠状电子密度的方法。通过假设感兴趣的高度的电晕径向结构，在确定系数之前，可以在每个谐波之前单独地进行视线集成，即，在初始化期间仅计算一次计算昂贵的集成。这种方法减少了找到最佳匹配所观察到的亮度的系数的问题，并且使用规程的最小二乘方法并且非常有效。该方法是关于从简单且复杂的冠状密度模型创建的合成数据的方法。在存在噪声和大的间隙存在下，重建质量在数据存在下是合理的。该方法应用于大角度和光谱调节器实验C2和太阳能关系观测到COR2调节观测，从2009年3月20日，两者的宇宙飞船的结果相比。将来的工作将将方法应用于大型数据集。

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