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Retour activité le 20 septembre

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Après une semaine de relative accalmie, quelques taches qui reviennent sur le disque. Un extrait de l'image H-apha le 20 septembre, avec Sol'Ex sur une lunette AstroPhysics de 120 mm :




Détail H-alpha :




Le même scan Sol'Ex en sortant de la raie H-alpha pour visualiser le groupe de tache (photosphère) :




Christian B


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