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  • 1
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    Anomalous increase of solar anisotropy above 150GV in 1981-1983 (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: An analysis was carried out of the observed data with Nagoya (surface). Misato (34mwe) and Sakashita (80mwe) multidirectional muon telescope, for the solar activity maximum period of 1978-1983. These data respond to primaries extending over the median rigidity range 60GV to 600GV. The observed amplitude at Sakashita station in 1981-1983 increased, especially in 1982; the amplitude is twice as large as that in 1978-1980, when those at Nagoya and Misato stations are nearly the same as those in 1978-1980. Uni-directional anisotropy is derived by the best fit method by assuming the flat rigidity spectrum with the upper cutoff rigidity Pu. The value of Pu obtained is 270GV in 1981-1983 and 150GV in 1978-1980.
    Keywords: SOLAR PHYSICS
    Type: SH-4.5-18 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 147-150; NASA-CP-2376-VOL-5
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  • 2
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    Solar tri-diurnal variation of cosmic rays in a wide range of rigidity (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Solar tri-diurnal variations of cosmic rays have been analyzed in a wide range of rigidity, using data from neutron monitors, and the surface and underground muon telescopes for the period 1978-1983. The rigidity spectrum of the anisotropy in space is assumed to be of power-exponential type as (P/gamma P sub o) to the gamma exp (gamma-P/P sub o). By means of the best-fit method between the observed and the expected variations, it is obtained that the spectrum has a peak at P (=gamma P sub o) approx = 90 GV, where gamma=approx 3.0 and P sub o approx. 30 GV. The phase in space of the tri-diurnal variation is also obtained as 7.0 hr (15 hr and 23 hr LT), which is quite different from that of approx. 1 hr. arising from the axisymmetric distribution of cosmic rays with respect to the IMF.
    Keywords: SOLAR PHYSICS
    Type: SH-4.5-3 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 106-109; NASA-CP-2376-VOL-5
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  • 3
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    Formulation of cosmic-ray solar daily variation and its seasonal variation, produced from generalized stationary anisotropy of solar origin (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: In previous papers, a formulation was presented of cosmic ray daily variations produced from solar anisotropies stationary through a year, and also of their annual (or seasonal) modulation caused by the annual variation of the rotation axis of the Earth relative to that of the Sun. These anisotropies are symmetric for an arbitrary rotation around an axis. From observations of the tri-diurnal variation, it has been suggested that solar anisotropies also contain some axis-asymmetric term of the third order with respect to the IMF-axis. This suggestion has recently found support in a theoretical study by Munakata and Nagashima. According to their results, the terms of axis-asymmetry with respect to IMF-axis appear also in the 2nd order anisotropy, together with some different kinds of axis-symmetric terms. The contribution of these anisotropies to the daily variation is different from that of those discussed previously. The above mentioned formulation is extended to a case of a generalized anisotropy.
    Keywords: SOLAR PHYSICS
    Type: SH-4.5-2 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 102-105; NASA-CP-2376-VOL-5
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  • 4
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    The first three harmonics of solar daily variation caused by the diffusive propagation of galactic cosmic rays through the heliosphere (1985)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Some results for the first three harmonics derived from the simulation of diffusion convection of galactic cosmic rays is presented. Also, some dependences of the results to the modulation parameters are presented. The results are discussed in comparison with observations and with the former studies of higher order anisotropy. In addition to this, the existence is suggested of the IMF-sense-dependent anisotropy of higher order.
    Keywords: SOLAR PHYSICS
    Type: SH-4.5-1 , 19th Intern. Cosmic Ray Conf - Vol. 5; p 98-101; NASA-CP-2376-VOL-5
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