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  • 1965-1969  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    On the motions of chromospheric fine-structure in a weak plage (1967)
    Springer
    Solar physics 1 (1967), S. 204-215 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Motions in an old center of activity have been studied at the limb with the use of timeresolved Hα spectra. The observations were made at intervals of 5 seconds over a period of 3/4 hour of good seeing at Sacramento Peak Observatory. Objects in this region have larger line-of-sight velocities than have been reported for spicules in quiet regions. Velocities as high as 70 km/sec were observed; seventeen percent of a sample of 200 instantaneous velocities exceed 30 km/sec. The line-of-sight velocities of 20 objects were measured as a function of time. For 5 of these, transverse velocity components could also be estimated. A single pattern, such as the simple rise without fall reported by Mouradian, does not exist. The motion is often quite complex, involving lateral expansion, shear and occasionally splitting. Reversal of sign of the velocity is not uncommon.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00150855
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    The solar H and K lines of ionized calcium (1968)
    Springer
    Solar physics 3 (1968), S. 164-180 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Photographic observations of the mean H and K profiles are given for several positions across the solar disk (0.1 〈 μ 〈 0.6). The core profiles of H and K are nearly identical at the same position on the sun. Estimates of the mean Doppler width and the depth of formation of the K2 emission peaks are given. A more elaborate analysis confirms that the K2 peaks are formed in a relatively shallow layer (τ 0 ∼ 3) in which the Doppler width decreases rapidly inward. The relevance of these conclusions to current attempts to predict theoretically the H and K profiles is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00154252
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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