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TZID:Europe/Paris
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UID:5505@i2m.univ-amu.fr
DTSTART;TZID=Europe/Paris:20130530T140000
DTEND;TZID=Europe/Paris:20130530T150000
DTSTAMP:20241029T171124Z
URL:https://www.i2m.univ-amu.fr/evenements/d-vibert-lam-solar-rotational-t
 omography-reconstruction-of-the-electronic-density-in-the-solar-corona/
SUMMARY: (...): D. Vibert (LAM): Solar Rotational Tomography: reconstructio
 n of the electronic density in the Solar Corona.
DESCRIPTION:: Solar Rotational Tomography: reconstruction of the electronic
  density in the Solar Corona.\n\nBy D. Vibert\\\, LAM\n\nAbstract:\nI will
  describe the concept of SRT applied to white light coronographic images\n
 and then focus on the time variation problem. The usual assumption is that
  the\ncorona is almost stable during one rotation so that a static tomogra
 phy can be\nachieved. This is strongly not valid near the sun and I will s
 how different\ntechniques we developed to address this issue. This problem
  is largely\nill-posed by nature and taking into account the time variatio
 n without\nincreasing the size of the observed data set leads to a massive
 ly\nundetermined problem needing a strong amount of regularization. The\ne
 mergence of efficient L1-norm minimization algorithm targeting large scale
 \nproblems without loosing too much accuracy let us apply a proximal\nspli
 tting method to achieve a TV spatio-temporal regularization of the\nleast-
 square solution.
CATEGORIES:Séminaire,Signal et Apprentissage
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DTSTART:20130331T030000
TZOFFSETFROM:+0100
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