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Mise en évidence de La granulation Solaire à 2000 Å

Abstract : Eight ultra-violet monochromatic pictures at the limb of the sun are analyzed for evidence of granulation in this spectral range (λ = 2000 Å). The spectral window (125 Å) is defined by two interference filters. These high-resolution pictures were obtained with a 20 cm Cassegrain telescope carried at 30 500 m of altitude by a stratospheric balloon. The resolution of the telescope is 1″. The instrument is mounted on a sunpointing control of excellent short time stability (2″). The pictures were taken at intervals of 210 seconds with a 0.25 second exposure. Large brilliant irregularities 10″ to 20″ in diameter are interpreted as chromospheric microfaculae with a half-hour lifetime. On the other hand, the smaller irregularities are interpreted as ultra-violet granulation. Using the correlation and structure functions, the analysis of the density distribution shows that spatial correlation of these irregularities is limited to a 4″ range.
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Jacques-Emile Blamont, G. Carpentier. Mise en évidence de La granulation Solaire à 2000 Å. Solar Physics, Springer Verlag, 1967, 1 (2), pp.180-190. ⟨10.1007/BF00150853⟩. ⟨insu-03523513⟩

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