Solar cycle variation of cosmic-ray north-south anisotropy and radial gradient

1986 ◽  
Vol 303 ◽  
pp. 843 ◽  
Author(s):  
J. W. Bieber ◽  
M. A. Pomerantz
Keyword(s):  
Solar Cycle ◽  
Cosmic Ray ◽  
Solar Cycle Variation ◽  
Radial Gradient ◽  
Cycle Variation

scholarly journals Probing the heliosphere with the directional anisotropy of galactic cosmic-ray intensity

2011 ◽  
Vol 7 (S286) ◽  
pp. 185-194 ◽  
Author(s):  
Kazuoki Munakata
Keyword(s):  
Solar Cycle ◽  
Magnetic Structure ◽  
Large Scale ◽  
Cosmic Ray ◽  
High Energy ◽  
Galactic Cosmic Rays ◽  
Spatial Gradient ◽  
Solar Cycle Variation ◽  
Directional Anisotropy ◽  
Cycle Variation

AbstractBecause of the large detector volume that can be deployed, ground-based detectors remain state-of-the-art instrumentation for measuring high-energy galactic cosmic-rays (GCRs). This paper demonstrates how useful information can be derived from observations of the directional anisotropy of the high-energy GCR intensity, introducing the most recent results obtained from the ground-based observations. The anisotropy observed with the global muon detector network (GMDN) provides us with a unique information of the spatial gradient of the GCR density which reflects the large-scale magnetic structure in the heliosphere. The solar cycle variation of the gradient gives an important information on the GCR transport in the heliosphere, while the short-term variation of the gradient enables us to deduce the large-scale geometry of the magnetic flux rope and the interplanetary coronal mass ejection (ICME). Real-time monitoring of the precursory anisotropy which has often been observed at the Earth preceding the arrival of the ICME accompanied by a strong shock may provide us with useful tools for forecasting the space weather with a long lead time. The solar cycle variation of the Sun's shadow observed in the TeV GCR intensity is also useful for probing the large-scale magnetic structure of the solar corona.

scholarly journals The solar cycle variation of topological structures in the global solar corona

2014 ◽  
Vol 565 ◽  
pp. A44 ◽  
Author(s):  
S. J. Platten ◽  
C. E. Parnell ◽  
A. L. Haynes ◽  
E. R. Priest ◽  
D. H. Mackay
Keyword(s):  
Solar Cycle ◽  
Solar Corona ◽  
Solar Cycle Variation ◽  
Topological Structures ◽  
Cycle Variation

scholarly journals Middle atmosphere response to the solar cycle in irradiance and ionizing particle precipitation

2011 ◽  
Vol 11 (10) ◽  
pp. 5045-5077 ◽  
Author(s):  
K. Semeniuk ◽  
V. I. Fomichev ◽  
J. C. McConnell ◽  
C. Fu ◽  
S. M. L. Melo ◽  
...  
Keyword(s):  
Solar Cycle ◽  
Radiative Forcing ◽  
Climate Model ◽  
Middle Atmosphere ◽  
High Energy ◽  
Galactic Cosmic Rays ◽  
Particle Precipitation ◽  
Solar Cycle Variation ◽  
Cycle Variation ◽  
The Impact

Abstract. The impact of NOx and HOx production by three types of energetic particle precipitation (EPP), auroral zone medium and high energy electrons, solar proton events and galactic cosmic rays on the middle atmosphere is examined using a chemistry climate model. This process study uses ensemble simulations forced by transient EPP derived from observations with one-year repeating sea surface temperatures and fixed chemical boundary conditions for cases with and without solar cycle in irradiance. Our model results show a wintertime polar stratosphere ozone reduction of between 3 and 10 % in agreement with previous studies. EPP is found to modulate the radiative solar cycle effect in the middle atmosphere in a significant way, bringing temperature and ozone variations closer to observed patterns. The Southern Hemisphere polar vortex undergoes an intensification from solar minimum to solar maximum instead of a weakening. This changes the solar cycle variation of the Brewer-Dobson circulation, with a weakening during solar maxima compared to solar minima. In response, the tropical tropopause temperature manifests a statistically significant solar cycle variation resulting in about 4 % more water vapour transported into the lower tropical stratosphere during solar maxima compared to solar minima. This has implications for surface temperature variation due to the associated change in radiative forcing.

scholarly journals Solar cycle variation of interstellar neutral He, Ne, O density and pick-up ions along the Earth's orbit

2016 ◽  
Vol 458 (4) ◽  
pp. 3691-3704 ◽  
Author(s):  
Justyna M. Sokół ◽  
Maciej Bzowski ◽  
Marzena A. Kubiak ◽  
Eberhard Möbius
Keyword(s):  
Solar Cycle ◽  
Solar Cycle Variation ◽  
Cycle Variation
Sign in / Sign up

Export Citation Format

Share Document