Tomography of the Solar Corona. II. Robust, Regularized, Positive Estimation of the Three-dimensional Electron Density Distribution from LASCO-C2 Polarized White-Light Images

Astronomy and Astrophysics – Astronomy

Scientific paper

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Methods: Data Analysis, Sun: Corona

Scientific paper

Solar rotational tomography is used to determine the three-dimensional electron density distribution of the solar corona from 2.4 to 6.0 Rsolar. The robust, regularized, positive estimation method, described in a previous paper, is demonstrated on test cases and on LASCO-C2 data. Because the solar rotational pole is inclined to the plane of the ecliptic by about 7°, the tomographic inversion requires a full three-dimensional treatment instead of a series of two-dimensional inversions. The LASCO data are taken from the first Whole Sun Month, which was a period of low solar activity.

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