A Multiscale Vision Model applied to analyze EIT images of the solar corona |
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Authors: | F Portier-Fozzani B Vandame A Bijaoui AJ Maucherat EIT Team |
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Institution: | 1. Max Planck Institut fur Aeronomie (MPAE), Max-Planck-Stra?e 2, D-37191, Katlenburg-Lindau, Germany 2. European Southern Observatory, Karl Schwarzschild Stra?e 2, D-85748, Garching bei München, Germany 3. Departement Cerga, UMR-CNRS 6527, Observatoire de la Cote d'Azur (OCA), BP 4229, 06304, Nice Cedex 04, France 4. LAS-CNRS, BP 8, 13376, Marseille Cedex 12, France
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Abstract: | The large dynamic range provided by the SOHO/EIT CCD (1 : 5000) is needed to observe the large EUV zoom of coronal structures
from coronal homes up to flares. Histograms show that often a wide dynamic range is present in each image. Extracting hidden
structures in the background level requires specific techniques such as the use of the Multiscale Vision Model (MVM, Bijaoui
et al., 1998). This method, based on wavelet transformations optimizes detection of various size objects, however complex they may
be. Bijaoui et al. built the Multiscale Vision Model to extract small dynamical structures from noise, mainly for studying galaxies. In this
paper, we describe requirements for the use of this method with SOHO/EIT images (calibration, size of the image, dynamics
of the subimage, etc.). Two different areas were studied revealing hidden structures: (1) classical coronal mass ejection
(CME) formation and (2) a complex group of active regions with its evolution. The aim of this paper is to define carefully
the constraints for this new method of imaging the solar corona with SOHO/EIT. Physical analysis derived from multi-wavelength
observations will later complete these first results.
Supplementary material to this paper is available in electronic form at http://dx.doi.org/10.1023/A:1017579625208
with J.P. Delaboudinière P.I. |
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