Journal ArticleDOI
Solar-cycle phenomena in cosmic-ray intensity: differences between even and odd cycles
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In this paper, a detailed statistical analysis of cosmic-ray intensity data for the period 1964-1985 covering two solar cycles is performed to investigate the solar activity behaviour in relation to cosmic-rays modulation.Abstract:
Cosmic-ray intensity data for the period 1964–1985 covering two solar cycles are used to investigate the solar activity behaviour in relation to cosmic-ray modulation A detailed statistical analysis of them shows a large time-lag of about one and half years between cosmic-ray intensity and solar activity (as indicated by sunspot number, solar flares and high-speed solar-wind streams) during the 21st solar cycle appearing for a first time This lag indicates the very high activity level of this solar cycle estimating the size of the modulating region to the unambiguous value of 180 AU The account of the solar-wind speed in the 11-year variation significantly decreases the modulation region of cosmic-rays to the value of 40 AUread 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
Possible Estimation of the Solar Cycle Characteristic Parameters by the 10.7 cm Solar Radio Flux
TL;DR: In this article, two independent methods for estimating basic parameters of the solar cycle are presented: ascending-descending triangle method and MinimaxX method, which uses a significant relation in the international sunspot number between the maximum value of a solar cycle and its value 2.5 or 3 years before the preceding minimum.
Journal ArticleDOI
Time-evolution of cosmic-ray intensity modulation
TL;DR: In this article, the amplitude and phase of all observed fluctuations were given by analyzing time-series into trigonometric series for the investigation of cosmic-ray intensity variations in a wide periodicity range from a few months to 10 or even more years.
Journal ArticleDOI
Spectral Analysis of Solar and Geomagnetic Parameters in Relation to Cosmic-ray Intensity for the Time Period 1965 – 2018
TL;DR: In this article, the spectral analysis of solar and geomagnetic parameters as well as of cosmic-ray intensity was performed aiming to identify possible new periodicities and confirm the well-known ones.
Journal ArticleDOI
Hale-cycle effects in cosmic-ray intensity during the last four cycles
TL;DR: In this paper, the effect of the polarity reversals of the polar magnetic field of the Sun on the heliosphere was investigated using both open and closed models of the system and showed that even and odd solar activity cycles can be explained in terms of different contributions of convection, diffusion and drift mechanisms.
References
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Journal ArticleDOI
Effects of drift on the transport of cosmic rays. VI - A three-dimensional model including diffusion
J. Kota,J. R. Jokipii +1 more
TL;DR: In this article, a series of computer simulations of the solar modulation of galactic cosmic rays using a full three-dimensional model which incorporates all known important effects on particle transport, particle drifts, convection with the solar wind, energy loss, and anisotropic diffusion is presented.
Journal Article
Interplanetary medium data book. Supplement 3: 1977-1985
David A. Couzens,Joseph H. King +1 more
TL;DR: In this paper, a detailed discussion of a data set compilation of hourly averaged interplanetary plasma and magnetic field parameters is presented, where the authors address data sources, systematic and random differences, time shifting of ISEE 3 data, and plasma normalization.
Journal ArticleDOI
Essential features of the 11-year solar cycle
TL;DR: In this paper, the authors have confirmed the fact that the 11-year cycle consists of two events (maxima) having different features during the first maximum (it coincides in time with the maximum of the Wolf numbers) and the second maximum occurs 2-3 years after the first one.
Journal ArticleDOI
Cosmic‐Ray Intensity Variations During Two Solar Cycles
TL;DR: In this article, an improved correction for instrumental drift at Huancayo is derived and the reliability of the corrections for seasonal variations is discussed and the variability of daily means of cosmic-ray intensity (from monthly means) is in 1957 the largest observed during two complete solar cycles.
Journal ArticleDOI
Interplanetary streams and their interaction with the earth
TL;DR: The theory of corotating streams, which attributes them to a high temperature region near the sun, satisfactorily explains many of the effects observed at 1 AU, has been proposed in this paper.