scholarly journals Empirical model of galactic cosmic ray particle fluxes based on the experimental data in solar cycles 21–24

2017 ◽  
Author(s):  
Mikhail Podzolko ◽  
Nikolay Kuznetsov ◽  
Elena Popova ◽  
Mikhail Panasyuk
Keyword(s):  
Experimental Data ◽  
Empirical Model ◽  
Cosmic Ray ◽  
Solar Cycles ◽  
Particle Fluxes ◽  
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.

scholarly journals Galactic cosmic ray radiation hazard in the unusual extended solar minimum between solar cycles 23 and 24

Space Weather ◽  
2010 ◽  
Vol 8 (5) ◽  
pp. n/a-n/a ◽  
Author(s):  
N. A. Schwadron ◽  
A. J. Boyd ◽  
K. Kozarev ◽  
M. Golightly ◽  
H. Spence ◽  
...  
Keyword(s):  
Solar Minimum ◽  
Cosmic Ray ◽  
Radiation Hazard ◽  
Solar Cycles ◽  
Galactic Cosmic Ray

scholarly journals On periodicities in long term climatic variations near 68° N, 30° E

2007 ◽  
Vol 13 ◽  
pp. 25-29 ◽  
Author(s):  
E. A. Kasatkina ◽  
O. I. Shumilov ◽  
M. Krapiec
Keyword(s):  
Magnetic Field ◽  
Solar System ◽  
Solar Radiation ◽  
Solar Magnetic Field ◽  
Cosmic Ray ◽  
Galactic Cosmic Rays ◽  
Field Direction ◽  
Magnetic Field Direction ◽  
Solar Cycles ◽  
Galactic Cosmic Ray

Abstract. It is generally believed that the low-frequency variability of climatic parameters seems to be connected to solar cycles. The principal periodicities are: 11-year (Schwabe), 22-year (Hale), 33-year (Bruckner) and 80–100-year (Gleissberg) cycles. The main heliophysical factors acting on climate, the biosphere and the atmosphere are solar irradiance, the intensity of solar and galactic cosmic rays (relativistic charged particles with energies >500 MeV) changing the cloud cover of the atmosphere, and UV-B-radiation. The 11-year and 80–90-year solar cycles are apparent in solar radiation and galactic cosmic ray trends. At the same time the bidecadal Hale cycle, related to a reversal of the main solar magnetic field direction is practically absent in either solar radiation or galactic cosmic ray variations. Besides, nobody can identify any physical mechanisms by which a reversal in the solar magnetic field direction could influence climate. However, the 22-year cycle has been identified in rather many regional climatic (droughts, rainfall, tree growth near 68° N, 30° E) and temperature records all over the world. We discuss here three possible cause of the bidecadal periodicity in climatic records, one of which is associated with a variation of stardust flux inside the Solar System. The most recent observations by the DUST experiment on board the Ulysses spacecraft have shown that the solar magnetic field lost its protective power during the last change of its polarity (the most recent solar maximum), so that the stardust level inside of the Solar System has been enhanced by a factor of three. It is possible that the periodic increases of stardust in the Solar System may influence the amount of extraterrestrial material that falls to the Earth and consequently act on the Earth's atmosphere and climate through alteration of atmospheric transparency and albedo. This material (interstellar dust and/or cometary matter) may also provide nucleation sites and thereby influence precipitation.

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