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  • 1
    Electronic Resource
    Electronic Resource
    Long-term Variation in the Magnitude of the Diurnal Anisotropy of Cosmic Rays (1967)
    [s.l.] : Nature Publishing Group
    Nature 214 (1967), S. 154-155 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The yearly average vector determined from data recorded at each of a number of stations with a wide geographical distribution appears to be the only suitable candidate for investigating the "steady state" nature of solar control of the diurnal anisotropy. The transient effects in the daily ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/214154a0
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  • 2
    Electronic Resource
    Electronic Resource
    Sectorial anisotropy of solar cosmic rays (1972)
    Springer
    Solar physics 27 (1972), S. 227-241 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A hitherto unobserved sectorial pattern of anisotropy that was limited to a narrow and stable region was displayed by the ground level event (GLE) of January 24, 1971. For the entire 11/2 h interval following onset before isotropy set in, the anisotropy was limited to a 10° cone centered about 60° from the spiral magnetic field line. It is also the first solar particle event for which it is possible, by analytical procedures based upon a theoretical propagation model, to distinguish between two rival candidates for the parent flare.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00151787
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  • 3
    Electronic Resource
    Electronic Resource
    Latitude and depth variation of solar rotation (1986)
    [s.l.] : Nature Publishing Group
    Nature 321 (1986), S. 500-501 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Modal patterns of trapped acoustic waves are described by the number of nodes of the wave pattern in the radial direction, H, the indices of the spherical harmonic function that characterizes the lateral wave pattern, / (degree) and m (azimuthal order) and cyclic oscillation frequency, v. Slow ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/321500a0
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  • 4
    Electronic Resource
    Electronic Resource
    Time–distance helioseismology (1993)
    [s.l.] : Nature Publishing Group
    Nature 362 (1993), S. 430-432 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Seismology, the study of earthquakes and waves radiated by earthquakes and explosions, has been fundamental to our understanding of the Earth's interior structure. The observations that have contributed most to this understanding are wave travel times and distances, free oscillation (or normal ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/362430a0
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  • 5
    Electronic Resource
    Electronic Resource
    Physical Sciences: Record-breaking Cosmic Ray Storm stemming from Solar Activity in August 1972 (1973)
    [s.l.] : Nature Publishing Group
    Nature 241 (1973), S. 331-333 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A cosmic ray storm comprises a superposition of Forbush decreases, that is, a series of sudden reductions in the intensity of the galactic cosmic radiation1. Although cosmic rays have been recorded continuously with ground-based detectors for almost four decades1, only one event of comparable ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/241331a0
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  • 6
    Electronic Resource
    Electronic Resource
    Solar Diurnal Anisotropy of Cosmic Rays (1969)
    [s.l.] : Nature Publishing Group
    Nature 223 (1969), S. 601-602 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The rigidity dependence of the amplitude of the solar daily variation as observed in the equatorial plane can be expressed in the form = 0R〈 RU R〉RU(2) It has become generally accepted on the basis of the analysis of neutron monitor data alone that (3 = 0, and the free space amplitude a = ax ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/223601a0
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  • 7
    Electronic Resource
    Electronic Resource
    Neutron monitor observations of high-energy solar particles during the new cycle (1967)
    Springer
    Solar physics 2 (1967), S. 491-501 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract After a lapse of five years, the first solar events in which particles were emitted with sufficiently high energies to produce intensity enhancements in ground-based neutron monitors occurred on July 7, 1966, and January 28, 1967. Although the magnitude of the first of these increases was too small (〈2%) to permit detailed analysis, the later event, which exceeded 18% at sea-level stations in the polar regions, displayed unusual characteristics. The January 28 event is anomalous in that either it represents the first observation of solar particles reaching the earth from the back side of the sun, or it is associated with a feeble flare (1-) in the unfavored eastern hemisphere of the visible disk. The propagation of solar particles in this event was evidently controlled by a diffusion mechanism, and the observations are consistent with predictions based on alternative theoretical models of this process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00146496
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  • 8
    Electronic Resource
    Electronic Resource
    The unusual anisotropic solar particle event of November 18, 1968 (1971)
    Springer
    Solar physics 19 (1971), S. 234-246 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The ground level event of November 18, 1968, was unusual in that pronounced anisotropy persisted essentially until the cessation of the arrival at the earth of relativistic protons. Real and significant differences were observed in the intensity profiles at different neutron monitor stations. By a method of successive approximations, the geographical coordinates of the axis of symmetry were determined as: latitude λ = - 25° ± 10° and longitude φ = -35° ± 10°. The exponent in a power law spectral representation over the narrow range covered by the nucleonic intensity measurements was υ ≈ 5. The onset times of the GLE were related to the angular differences between the mean directions of viewing and the axis of symmetry. The event differed markedly from earlier isotropic events that were well described by diffusion theory, but was compatible with the predictions of a model envisaging diffusion only in the vicinity of the Sun (radius R of solar envelope ≈ 34 solar radii). The diffusion coefficient D ≈ 3 × 1021 cm2/s is consistent with that deduced for earlier isotropic events, but the values of other parameters are smaller than those derived for the only previously observed event to which the model of diffusion in an inhomogeneous medium was applicable (May 4, 1960). It is concluded that the observed one hundred percent anisotropy was a direct consequence of the propagation mechanism rather than other postulated causes. Furthermore, the observed large pitchangle distribution was produced by scattering from small scale field irregularities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148837
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  • 9
    Electronic Resource
    Electronic Resource
    Statistical considerations in the analysis of solar oscillation data by the superposed epoch method (1983)
    Springer
    Solar physics 82 (1983), S. 113-122 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Although the method of superposed epochs (Chree analysis) has been utilized for seven decades, a procedure to determine the statistical significance of the results has not been available heretofore. Consequently, various subjective methods have been utilized in the interpretation of Chree analysis results in several fields. The major problem in the statistical treatment of Chree analysis results arises from the fact that in most studies of natural phenomena, data are neither random nor sequentially independent. In this paper, a statistical procedure which takes this factor into account is developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00145551
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  • 10
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    Direct Observation of Periodic Variation of Primary Cosmic-Ray Intensity (1958)
    American Physical Society
    Details
    Publication Date: 1958-01-01
    Print ISSN: 0031-899X
    Electronic ISSN: 1536-6065
    Topics: Physics
    Published by American Physical Society
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