Galactic cosmic ray modulation during the last five solar cycles

2006 ◽  
Vol 111 (A1) ◽  
Author(s):  
I. Sabbah ◽  
M. Rybanský
Keyword(s):  
Cosmic Ray ◽  
Solar Cycles ◽  
Cosmic Ray Modulation ◽  
Galactic Cosmic Ray

scholarly journals Galactic Cosmic Ray Modulation Up to Recent Solar Cycles

2011 ◽  
Vol 48 (4) ◽  
pp. 66-70
Author(s):  
R. Agarwal ◽  
R. Mishra
Keyword(s):  
Solar Cycle ◽  
Solar Radio ◽  
Cosmic Ray ◽  
Radio Flux ◽  
Solar Cycles ◽  
Cosmic Ray Intensity ◽  
Cosmic Ray Modulation ◽  
Solar Radio Flux ◽  
Yearly Average ◽  
Galactic Cosmic Ray

Galactic Cosmic Ray Modulation Up to Recent Solar Cycles Cosmic ray neutron monitor counts obtained by different ground-based detectors have been used to study the galactic cosmic ray modulation during the last four solar activity cycles. Since long, systematic correlative studies have been per-formed to establish a significant relationship between the cosmic ray intensity and different helio-spheric activity parameters, and the study is extended to a recent solar cycle (23). In the present work, the yearly average of 10.7 cm solar radio flux and the interplanetary magnetic field strength (IMF, B) have been used to find correlation of the yearly average cosmic ray intensity derived from different neutron monitors. It is found that for four solar cycles (20-23) the cosmic ray intensity is anti-correlated with the 10.7 cm solar radio flux and the IMF, B value with some discrepancy. However, this is in a good positive correlation with the flux of mentioned wavelength for four different solar cycles. The IMF, B shows a weak correlation with cosmic rays for solar cycle 20, and a good anti-correlation for solar cycles 21-23.

Change in the rigidity dependence of the galactic cosmic ray modulation in 2008–2009

2012 ◽  
Vol 49 (4) ◽  
pp. 784-790 ◽  
Author(s):  
G.A. Bazilevskaya ◽  
M.B. Krainev ◽  
V.S. Makhmutov ◽  
Yu.I. Stozhkov ◽  
A.K. Svirzhevskaya ◽  
...  
Keyword(s):  
Cosmic Ray ◽  
Cosmic Ray Modulation ◽  
Galactic Cosmic Ray ◽  
Rigidity Dependence

Cosmic Ray Modulation with the Maximum CME Speed Index During Solar Cycles 23 and 24

Solar Physics ◽  
2019 ◽  
Vol 294 (7) ◽  
Author(s):  
Volkan Sarp ◽  
Ali Kilcik ◽  
Vasyl Yurchyshyn ◽  
Atila Ozguc ◽  
Jean-Pierre Rozelot
Keyword(s):  
Cosmic Ray ◽  
Solar Cycles ◽  
Cosmic Ray Modulation

Galactic cosmic-ray modulation effect by solar-wind streams

1995 ◽  
Vol 73 (9-10) ◽  
pp. 642-646 ◽  
Author(s):  
M. A. El-Borie
Keyword(s):  
Solar Wind ◽  
Wind Speed ◽  
Cosmic Rays ◽  
Solar Wind Speed ◽  
Cosmic Ray ◽  
Diurnal Variations ◽  
Solar Cycles ◽  
Mean Values ◽  
Wind Speeds ◽  
Cosmic Ray Modulation

Data, from the worldwide network of neutron monitors, recorded at Deep River, Hermanus, Rome, Tokyo, and Huancayo, over two solar cycles (Nos. 20 and 21) are analyzed to study the long-term variations of the solar diurnal variations as they relate to solar-wind speed. The median primary rigidities of response (Rm) for these detectors cover the range 16 GV ≤ Rm ≤ 33 GV. We discuss the solar diurnal variations (amplitude and phase) of cosmic rays as a function of solar activity. The behavior of solar diurnal phases is completely different for the two epochs of high-wind speed. Data of solar-wind speed from 1966–1986 are classified according to the state of the daily mean values. Variation in the amplitudes of the diurnal variations, as functions of the median primary rigidity of cosmic rays, for the two selected periods (1973–1975 and 1979–1981) of high and low solar-wind speeds were determined at the selected stations. The rigidity dependence of the averaged solar diurnal variations of cosmic rays related to the high solar-wind speed was studied. The most sensitive rigidity of modulation is around 20 and 30 GV during the 1973–1975 and 1979–1981 periods, respectively. Our results also show that there is a significant correlation in the solar diurnal amplitudes between the two divisions of high and low solar-wind speed days.

scholarly journals Solar Modulation Effects in Terrestrial Production of Carbon-14

Radiocarbon ◽  
1980 ◽  
Vol 22 (2) ◽  
pp. 133-158 ◽  
Author(s):  
Giuliana Castagnoli ◽  
Devendra Lal
Keyword(s):  
Solar Activity ◽  
Cosmic Ray ◽  
Solar Modulation ◽  
Carbon 14 ◽  
Cosmic Ray Modulation ◽  
The Earth ◽  
Secular Variations ◽  
Galactic Cosmic Ray ◽  
Long Term Variations

This paper is concerned with the expected deviations in the production rate of natural 14C on the earth due to changes in solar activity. We review the published estimates of the global production rates of 14C due to galactic and solar cosmic ray particles, and present new estimates of the expected secular variations in 14C production, taking into account the latest information available on galactic cosmic ray modulation and long-term variations in solar activity.

An Unusual Pattern of Cosmic-Ray Modulation During Solar Cycles 23 and 24

Solar Physics ◽  
2014 ◽  
Vol 290 (3) ◽  
pp. 943-950 ◽  
Author(s):  
A. A. Pacini ◽  
I. G. Usoskin
Keyword(s):  
Cosmic Ray ◽  
Solar Cycles ◽  
Unusual Pattern ◽  
Cosmic Ray Modulation
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