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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Solar physics 1 (1967), S. 180-190 
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Summary 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.
    Notes: Résumé Huit photographies monochromatiques (λ=2000 Å) au bord du soleil sont analysées en vue de mettre en évidence la granulation dans le domaine ultra-violet lointain. La fenêtre spectrale est définie par deux filtres interférentiels qui donnent une bande passante à mi-hauteur de 125 Å. Ces clichés de haute résolution ont été obtenus en ballon stratosphérique à une altitude de 30 500 m en profitant d'une fenêtre de transparence atmosphérique et en utilisant un télescope Cassegrain de 20 cm d'ouverture dont la résolution atteint 1″. Ce télescope était porté par un dispositif pointeur de soleil dont la stabilité à court terme était meilleure que 2″. Les clichés ont été pris à intervalles de 210 secondes avec un temps de pose de 0.25 seconde. On observe d'une part des variations de brillance grossières de largeur comprise entre 10″ et 20″ qui sont interprétées comme microfacules chromosphériques de durée de vie supérieure à 1/2 heure. On observe d'autre part une granulation dont la distribution densitométrique pour laquelle on a calculé les fonctions de corrélation et de structure présente une corrélation limitée à une distance angulaire de 4″.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Solar physics 3 (1968), S. 64-81 
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We succeeded in several attempts at measuring the solar limb-darkening in the continuous spectrum between 1800 Å and 2900 Å. Good spectroheliograms were obtained during a rocket flight in November 1964 and during a balloon flight in October 1966 at 2190 Å, 2665 Å, 2885 Å, and 1980 Å, 2235 Å respectively. A rocket flown at the beginning of 1967 provided excellent spectra allowing the measurement of center-to-limb variation in the continuum and lines from 1800 Å to 2800 Å. The first series of pictures yielded absolute values of the central intensity leading to a minimum temperature close to 4700 °K. The continuous opacity of the photosphere layers has been deduced from the two first experiments. It seems that a non-metallic source of continuous absorption must be taken into account between 2500 Å and 3000 Å. Moreover, as the source functions for the shortest wavelengths show a very flat variation near the minimum temperature, it seems that the transition zone between the photosphere and the chromosphere must be very gradual. These results are discussed in the light of the latest results deduced from the new spectra obtained.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Voyager Ultraviolet Spectrometer (UVS) is an objective grating spectrometer covering the wavelength range of 500–1700 Å with 10 Å resolution. Its primary goal is the determination of the composition and structure of the atmospheres of Jupiter, Saturn, Uranus and several of their satellites. The capability for two very different observational modes have been combined in a single instrument. Observations in the airglow mode measure radiation from the atmosphere due to resonant scattering of the solar flux or energetic particle bombardment, and the occultation mode provides measurements of the atmospheric extinction of solar or stellar radiation as the spacecraft enters the shadow zone behind the target. In addition to the primary goal of the solar system atmospheric measurements, the UVS is expected to make valuable contributions to stellar astronomy at wavelengths below 1000 Å.
    Type of Medium: Electronic Resource
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  • 4
    Publication Date: 1968-01-01
    Print ISSN: 0038-0938
    Electronic ISSN: 1573-093X
    Topics: Physics
    Published by Springer
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  • 5
    Publication Date: 1967-03-01
    Print ISSN: 0038-0938
    Electronic ISSN: 1573-093X
    Topics: Physics
    Published by Springer
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