2008/02/01 by Nicolas Barbey, F. Auchère, Frédéric Auchère +3 · 1 citation
Biochemistry, Genetics and Molecular Biology · Earth and Planetary Sciences · Mathematics · Physics and Astronomy · #Algorithm #Astronomy #Astrophysics #Computer science #Extreme ultraviolet #Geomagnetism and Paleomagnetism Studies #Geophysics and Gravity Measurements #Inverse problem #Inversion (geology) #Mathematical analysis #Occultation #Optics #Physics #Polar #Solar and Space Plasma Dynamics #Trajectory #astro-ph #stat.AP
paper · pdf · doi:10.1007/s11207-008-9151-6
arxiv created 2008/02/01 · openalex publication_date 2008/04/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
An important issue in the tomographic reconstruction of the solar poles is the relatively rapid evolution of the polar plumes. We demonstrate that it is possible to take into account this temporal evolution in the reconstruction. The difficulty of this problem comes from the fact that we want a 4D reconstruction (three spatial dimensions plus time) while we only have 3D data (2D images plus time). To overcome this difficulty, we introduce a model that describes polar plumes as stationary objects whose intensity varies homogeneously with time. This assumption can be physically justified if one accepts the stability of the magnetic structure. This model leads to a bilinear inverse problem. We describe how to extend linear inversion methods to these kinds of problems. Studies of simulations show the reliability of our method. Results for SOHO/EIT data show that we are able to estimate the temporal evolution of polar plumes in order to improve the reconstruction of the solar poles from only one point of view. We expect further improvements from STEREO/EUVI data when the two probes will be separated by about 60 degrees.