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  • SPACE RADIATION  (5)
  • 1990-1994
  • 1985-1989  (5)
  • 1980-1984
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  • 1990-1994
  • 1985-1989  (5)
  • 1980-1984
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  • 1
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    Rigidity spectrum of Forbush decrease (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Using data from neutron monitors and muon telescopes at surface and underground stations, the average rigidity spectrum of Forbush decreases (Fds) during the period of 1978-1982 were obtained. Thirty eight Ed-events are classified into two groups Hard Fd and Soft Fd according to size of Fd at Sakashita station. It is found that a spectral form of fractional-power type (P to the-gamma sub 1 (P+P sub c) to the -gamma sub2) is more suitable for the present purpose than that of power-exponential type or of power type with an upper limiting rigidity. The best fitted spectrum of fractional-power type is expressed by gamma sub1 = 0.37, gamma sub2 = 0.89 and P subc = 10 GV for Hard Fd and gamma sub1 = 0.77, gamma sub2 = 1.02 and P sub c - 14GV for Soft Fd.
    Keywords: SPACE RADIATION
    Type: SH-5.1-6 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 238-241; NASA-CP-2376-VOL-5
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Corrected sidereal anisotropy for underground moons (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Data from underground muon telescopes in New Mexico and Bolivia are analyzed in sidereal time and anti-sidereal time in the rigidity range 20 GV to a few 100's of GV. Using both vertical and north- and south- pointing telescopes in both hemispheres, a latitude range of 70 N to 50 S is covered. It is shown that there is an anti-sidereal variation of the P 1 over 2 type, having opposite phase in the Northern and Southern Hemispheres, and maximum amplitude at mid latitudes. The anti-sidereal data are used to correct the sidereal data, using the Nagashima method (Nagashima, 1984); the resulting corrected sidereal vectors for northern hemisphere telescopes have their sidereal maxima close to 3h sidereal time, in reasonable agreement with sidereal data at higher energies from small air showers. The Nagashima correction also eliminates effects due to the reversal of the Sun's polar magnetic field which show up in the uncorrected sidereal data.
    Keywords: SPACE RADIATION
    Type: SH-4.4-7 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 48-51; NASA-CP-2376-VOL-5
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Sidereal anisotropies in the median rigidity range 60-600GV in 1978-1983 (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Observed sidereal variations are corrected for the influence of spurious variation by a method using the antisidereal diurnal variations produced from the same 2nd order anisotropy (Nagashima, et al., 1983). It is demonstrated that the corrected variations are a resultant product of two constituents of galactic origin: one is north-south (N-S) symmetric and the other is N-S asymmetric.
    Keywords: SPACE RADIATION
    Type: SH-4.4-3 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 35-38; NASA-CP-2376-VOL-5
    Format: application/pdf
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  • 4
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    Cosmic ray sidereal diurnal variation of galactic origin observed by neutron monitors (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Cosmic ray sidereal diurnal variations observed by neutron monitors are analyzed for the period 1961 to 1978, by adding 134 station years data to the previous paper (Nagashima, et al., 1983). Also the dependence of the sidereal variations on Sun's polar magnetic field polarity is examined for two periods; the period of negative polarity in the northern region, 1961 to 1969 and the period of positive polarity, 1970 to 1978. It is obtained that for the former period, the amplitude A=0.0203 + or 0.0020% and the phase phi=6.1 + or - 0.4 h LST and for the latter period, 0.0020% and phi=8.6 + or - 4 h LST, respectively.
    Keywords: SPACE RADIATION
    Type: SH-4.4-2 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 31-34; NASA-CP-2376-VOL-5
    Format: application/pdf
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  • 5
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    IMF-sense-dependent cosmic ray anisotropy produced from diffusion-convection in heliosphere (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: It was demonstrated that an interplanetary magnetic field (IMF) sense dependent 2nd order anisotropy is produced by the diffusion convection of cosmic rays in the heliomagnetosphere. The result implies that the anisotropy cannot be expressed only by the pitch angle with respect to the IMF axis.
    Keywords: SPACE RADIATION
    Type: SH-4.3-9 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 9-12; NASA-CP-2376-VOL-5
    Format: application/pdf
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