Abstract
SOHO/LASCO data were used to obtain the latitudinal and radial distributions of the brightness of the K- and F-corona in the period of 1996 – 2007, and their solar-cycle variations were studied. Then an inversion method was employed to obtain the radial distributions of the electron density N e(R,θ) for various latitude values on the coronal images. Our values of N e(R,θ) are in good agreement with the findings of other authors. We found that in an edge-on streamer belt the electron density, like the K-corona brightness, varies with distance more slowly in the near-equatorial rays than in near-polar regions. We have developed a method for assessing the maximum values of the electron density at the center of the face-on streamer belt in its bright rays and depressions between them. Not all bright rays observed in the face-on streamer belt are found to be associated with an increased electron density in them. Mechanisms for forming such rays have been suggested.
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Fainshtein, V.G., Tsivileva, D.M. & Kashapova, L.K. Latitudinal and Solar-Cycle Variations of the White-Light Corona from SOHO/LASCO Observations. Sol Phys 267, 203–216 (2010). https://doi.org/10.1007/s11207-010-9645-x
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DOI: https://doi.org/10.1007/s11207-010-9645-x