Two approaches are suggested for recording the continuum corona in the range < 1.4 Rsun. They are different from the classical coronagraphic ones. Current state in the thin film technology allows discussing a new generation coronagraph with a variable transmission of an entrance aperture. The estimated coronagraphic factor is 2 orders of magnitude higher compared to a Lyot-type coronagraph. Another approach is based on the use of total solar eclipses at near-Mercury orbits. The instrumental background is decreased at least 3 orders of magnitude. That allows using a more simplified optical sketch.
@article{arxiv.1502.04641,
title = {K-corona recording in the range < 1.4 Rsun},
author = {I. S. Kim and O. I. Bugaenko and D. V Lisin and L. P. Nasonova},
journal= {arXiv preprint arXiv:1502.04641},
year = {2015}
}
Comments
Conference, Proceedings of the All-Russian annual conference "Solar and Solar-Terrestrial Physics-2014", 2014, St Petersburg State University, p. 215-218 (in Russian)