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Three-Dimensional Electron Density from Tomographic Analysis of LASCO-C2 Images of the K-Corona Total Brightness |
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| Authors: | Richard A Frazin Philippe Lamy Antoine Llebaria Alberto M Vásquez |
| Institution: | 1. Dept. of Atmospheric, Oceanic and Space Sciences, University of Michigan, Ann Arbor, MI, 48109, USA 2. Laboratoire d’Astrophysique de Marseille, Université de Provence – CNRS, 38 rue Frédéric Joliot-Curie, 13388, Marseille cedex 13, France 3. Instituto de Astronomía y Física del Espacio, CONICET – University of Buenos Aires, CC 67 Suc 28, Ciudad de Buenos Aires, Argentina |
| Abstract: | We present the first quantitative three-dimensional (3D) tomographic reconstructions of electron density from coronagraph measurements of the K-corona’s total brightness (B) made by LASCO-C2 on SOHO. This is possible because new calibrations of the LASCO-C2 images in both polarized brightness (pB) and B have now been made for the entire mission. The B and pB reconstructions are compared, and the differences are explained in terms of line of sight weighting functions in Thomson scattering. We conclude that the LASCO-C2 B archive, which is vastly larger than the pB archive, will be a very valuable resource for determining the 3D electron density throughout the SOHO mission which started taking data in 1996. |
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