Using Galactic Cosmic Ray Observations for Determination of the Heliosphere Structure During Different Solar Cycles

2003 ◽  
Author(s):  
Lev I. Dorman
Keyword(s):  
Cosmic Ray ◽  
Solar Cycles ◽  
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 Galactic cosmic ray hydrogen spectra and radial gradients in the inner heliosphere measured by the HELIOS Experiment 6

2019 ◽  
Vol 625 ◽  
pp. A153 ◽  
Author(s):  
J. Marquardt ◽  
B. Heber
Keyword(s):  
Operation Time ◽  
Solar Energetic Particle ◽  
Cosmic Ray ◽  
Solar Observation ◽  
Temperature Dependent ◽  
Outer Heliosphere ◽  
Quenching Factor ◽  
Galactic Cosmic Ray ◽  
Inner Heliosphere

Context. The HELIOS solar observation probes provide unique data regarding their orbit and operation time. One of the onboard instruments, the Experiment 6 (E6), is capable of measuring ions from 4 to several hundred MeV nucleon−1. Aims. In this paper we aim to demonstrate the relevance of the E6 data for the calculation of galactic cosmic ray (GCR), anomalous cosmic ray (ACR), and solar energetic particle (SEP) fluxes for different distances from the sun and time periods. Methods. Several corrections have been applied to the raw data: determination of the Quenching factor of the scintillator, correction of the temperature dependent electronics, degradation of the scintillator as well as the effects on the edge of semi-conductor detectors. Results. Fluxes measured by the E6 are in accordance with the force field solution for the GCR and match models of the anomalous cosmic ray propagation. GCR radial gradients in the inner heliosphere show a different behaviour than in the outer heliosphere.

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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