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  • 1
    Electronic Resource
    Electronic Resource
    Gravitational wave excitation of the 160-min solar oscillation? (1984)
    [s.l.] : Nature Publishing Group
    Nature 308 (1984), S. 164-165 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Knowledge of the relevant solar eigenmode and corresponding damping time can be used to calculate the Sun's resonant gravitational wave cross-section. While there is some uncertainty in the solar model, the calculated structure of the eigenmodes should be sufficiently accurate. Theoretical h-mode ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/308164a0
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  • 2
    Electronic Resource
    Electronic Resource
    Rossby waves on the Sun as revealed by solar ‘hills’ (2000)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 405 (2000), S. 544-546 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] It is a long-standing puzzle that the Sun's photosphere—its visible surface—rotates differentially, with the equatorial regions rotating faster than the poles. It has been suggested that waves analogous to terrestrial Rossby waves, and known as r-mode oscillations, could explain the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/35014530
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  • 3
    Electronic Resource
    Electronic Resource
    The Sun's shape and brightness (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 392 (1998), S. 155-157 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The origin of the 11- and 22-year solar cycles remains one of the more mysterious aspects of the Sun. These cycles are probably driven by convection in the solar interior, but the convection zone is difficult to probe. Small departures from sphericity in the effective surface temperature of the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/32361
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  • 4
    Electronic Resource
    Electronic Resource
    How bright is the [Si X] 1431 nm coronal emission line? (1994)
    Springer
    Solar physics 151 (1994), S. 51-56 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Airborne eclipse observations of the [Six] 1430.5 nm coronal emission line are reviewed, and new ground-based out-of-eclipse coronagraph observations obtained at NSO/Sacramento Peak are reported. We find that the [Six] 1430.5 nm coronal emission line brightness is less than 8 × 10−6 B⊙ in small active region corona which showed [Fexiii] 1074.7 nm emission (corrected for sky background) of about 20 × 10−6 B⊙.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654081
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  • 5
    Electronic Resource
    Electronic Resource
    Low-l 5-min oscillation observations (1983)
    Springer
    Solar physics 87 (1983), S. 207-219 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Medium resolution CCD-spectrograph observations have been obtained that are suitable for studying long spatial wavelength 5-min oscillations. We find evidence that at wavelengths of order one solar radius the oscillation field is not isotropic. It is also not well described by modes of uniform excitation. The velocity power density per spherical harmonic increases with decreasing l to 1.1 × 103 cm2 s−2 per 3.5 × 10−4 Hz angular frequency bandwidth at l = 4. These results are inconsistent with the data of Fossat and Ricort (1975) as analyzed by Christensen-Dalsgaard and Gough (1982), who found a substantially constant modal amplitude at intermediate l values. It is interesting that other calculations have seen a similar dependence at small l in the growth rate of p-modes due to the κ-mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00224834
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  • 6
    Electronic Resource
    Electronic Resource
    Using eclipse observations to test scintillation models (1995)
    Springer
    Solar physics 156 (1995), S. 1-5 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Near second and third contact during a solar eclipse the spatial spectrum of the solar illumination changes as the relative power at high spatial frequencies increases strongly. Since groundlevel atmospheric scintillation depends on a weighted integral of the image power spectrum, we can expect to see a measureable time dependence to solar scintillation during an eclipse. This effect was observed during an annular solar eclipse and quantitatively compared with a scintillation model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00669570
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  • 7
    Electronic Resource
    Electronic Resource
    Facular influences on the apparent solar shape (1983)
    [s.l.] : Nature Publishing Group
    Nature 304 (1983), S. 326-328 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] During the summer of 1966 the Sun was quiet and for 20-30% of the observational days there were only a few weak facular patches at the solar limb. But the 'ellipticity signal' did not disappear on those days4, hence cannot be wholly facular in origin, a conclusion which is independent of any ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/304326a0
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  • 8
    Electronic Resource
    Electronic Resource
    Evidence of global circulation currents from solar-limb temperature variations (1987)
    [s.l.] : Nature Publishing Group
    Nature 328 (1987), S. 326-327 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] If the latitudinal differential rotation is 'driven' by angular momentum transport throughout the convection zone, then meridional flows and large-scale convection ('giant cells') should be present. A corresponding modulation in the convective heat flux due to these giant cells is then also ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/328326a0
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  • 9
    Electronic Resource
    Electronic Resource
    Solar ellipticity fluctuations yield no evidence of g -modes (1986)
    [s.l.] : Nature Publishing Group
    Nature 319 (1986), S. 128-131 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The surface velocity amplitudes of solar g-modes appear to be between 0.1 and 1 m s-1, but there is little agreement between different observers on the excitation spectrum. Several groups have, however, claimed detection of a 160.01-min period solar oscillation4'5 also with a velocity amplitude ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/319128a0
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  • 10
    Electronic Resource
    Electronic Resource
    Oblateness of the Sun in 1983 and relativity (1985)
    [s.l.] : Nature Publishing Group
    Nature 316 (1985), S. 687-690 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Measurements of the solar oblateness obtained during 1983 from Mount Wilson, California, yield a value with an upper bound only half of that observed in 1966. This difference may support the conjecture that the solar quadrupole moment slowly oscillates. A knowledge of the character of such an ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/316687a0
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