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  • 1
    Electronic Resource
    Electronic Resource
    Downflows under sunspots detected by helioseismic tomography (1996)
    [s.l.] : Nature Publishing Group
    Nature 379 (1996), S. 235-237 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The recent discovery2 of how to measure the time taken by acoustic waves to travel inside the Sun is a powerful tool for studying the solar interior. This approach directly measures the travel time of acoustic waves between any point on the solar surface and a surrounding annulus. As a packet of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/379235a0
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Frequency stability of solar oscillations (1988)
    [s.l.] : Nature Publishing Group
    Nature 333 (1988), S. 646-649 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Extensive data obtained at the Observatorio del Teide (Izafia, Tenerife) from 1977 to 1985 are analysed to determine the lifetimes and frequencies of the /0 and /t p-modes. The import-ance of the lifetime of the mode in determining the frequency is considered. From an analysis of the phase and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/333646a0
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A simple method for correcting spatially resolved solar intensity oscillation observations for variations in scattered light (1991)
    Springer
    Solar physics 132 (1991), S. 215-222 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A measurement of the intensity distribution in an image of the solar disk will be corrupted by a spatial redistribution of the light that is caused by the Earth's atmosphere and the observing instrument. If the precise form of the spatial point spread function is known and can be modeled, then the observed image can be corrected for its effects. However, accurate modeling of the spatial point spread function, which can be considered as composed of a ‘blurring’ component and a ‘scattering’ component (Zwaan, 1965), is difficult and the correction for its effects is computationally expensive. We introduce a simple correction method that is applicable for solar p-mode intensity observations obtained over a period of time in which there is a significant change in the scattering component of the point spread function. The method circumvents the problems incurred with an accurate determination of the spatial point spread function and its subsequent deconvolution from the observations. The method only corrects the spherical harmonic coefficients that represent the spatial frequencies present in the image and does not correct the image itself. The method is computationally inexpensive and has the potential of being useful in correcting for changes in the blurring component of the point spread function and also for correcting velocity images.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00152283
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    Paper (German National Licenses)
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