Journal ArticleDOI
An empirical model for the 11-year cosmic-ray modulation
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TLDR
In this paper, an empirical relation for the cosmic-ray modulation has been found, which is well explained by a generalization of the Simpson solar wind model which has been proved by the spherically symmetric diffusion-convection theory.Abstract:
An analysis of monthly data from nine world-wide neutron monitoring stations over the period 1965–1975 is carried out for the study of the long-term cosmic-ray modulation. In an attempt to gain insight into the relationships which exist between solar activity, high-speed solar wind streams and various terrestrial phenomena an empirical relation for the cosmic-ray modulation has been found. Accordingly the modulated cosmic-ray intensity is equal to the galactic cosmic-ray intensity corrected by a few appropriate solar, interplanetary and terrestrial activity indices which causes the disturbances in interplanetary space, multiplying with the corresponding time-lag of cosmic-ray intensity from each of these indices. This relation is well explained by a generalization of the Simpson solar wind model which has been proved by the spherically symmetric diffusion-convection theory.read more
Citations
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Cosmic-Ray Modulation: An Empirical Relation with Solar and Heliospheric Parameters
TL;DR: In this article, the authors compared the long-term variations of galactic cosmic rays with the behavior of various solar activity indices and heliospheric parameters during the current solar cycle.
Journal ArticleDOI
Galactic Cosmic Ray Modulation and the Last Solar Minimum
TL;DR: In this article, the galactic cosmic ray modulation in relation to solar activity indices and heliospheric parameters during the years 1996-2010 covering solar cycle 23 and the solar minimum between cycles 23 and 24 is studied.
Journal ArticleDOI
Simulation of long-term cosmic-ray intensity variation
TL;DR: In this article, the long-term modulation of galactic cosmic-rays has been studied using nine world-wide neutron monitor stations for the period 1975-1985 and the empirical formula which has been used to compute the longterm cosmic-ray variations follows the observations fairly well.
Journal ArticleDOI
Modeling the Relationship Between Neutron Counting Rates and Sunspot Numbers Using the Hysteresis Effect
TL;DR: In this article, the authors used the hysteresis effect to model the relationship between neutron counting rates (NCRs), an indicator of the GCR intensity, and sunspot numbers (SSNs) over the period that covers the last four solar cycles (20, 21, 22, and 23).
Journal ArticleDOI
Long-Term Cosmic Ray Variability and the CME-Index
TL;DR: In this article, the cosmic ray modulation in relation to solar activity indices and heliospheric parameters during the period January 1996-October 2011, covering the solar cycle 23 and the ascending phase of solar cycle 24, is studied.
References
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Journal ArticleDOI
High-speed solar-wind streams and galactic cosmic-ray modulation
TL;DR: In this article, two classes of fast solar-wind streams are identified: quiet streams and perturbed streams, coming from active regions producing type-IV solar flares, which are accompanied by Forbush decreases whose amplitude and time behaviour are not directly related to speed increase.
Journal ArticleDOI
Observations of the eleven-year cosmic-ray modulation cycle
TL;DR: In this paper, a review of the available observations and the present state of knowledge of the long-term modulation of the intensity of galactic cosmic rays is presented, which occurs in response to the 11-year cycle of solar activity.
Twenty-Two Year Modulation of Cosmic Rays Associated with Polarity Reversal of Polar Magnetic Field of the Sun
K. Nagashima,I. Morishita +1 more
TL;DR: In this paper, the existence of the 22-year modulation of cosmic ray intensity is pointed out, using data of the ion chamber at Huancayo and the neutron monitors at Ottawa and Deep River for about four solar cycles.
Journal ArticleDOI
Twenty-two year modulation of cosmic rays associated with polarity reversal of polar magnetic field of the sun
K. Nagashima,I. Morishita +1 more
TL;DR: In this article, the existence of the 22-year modulation of cosmic ray intensity is pointed out, using data of the ion chamber at Huancayo and the neutron monitors at Ottawa and Deep River for about four solar cycles.
Journal ArticleDOI
Long term modulation of cosmic rays and inferable electromagnetic state in solar modulating region
K. Nagashima,I. Morishita +1 more
TL;DR: In this paper, it was shown that the long term variation in cosmic ray intensity I(t) can be described by an integral equation, which is derived from a generalization of Simpson's coasting solar wind model.