Cosmic-ray transport simulation through the atmosphere in the South Atlantic Magnetic Anomaly

2012 ◽  
Author(s):  
M. T. Pazianotto ◽  
O. L. Gonçalez ◽  
C. A. Federico ◽  
B. V. Carlson
Keyword(s):  
Magnetic Anomaly ◽  
Cosmic Ray ◽  
South Atlantic ◽  
The South ◽  
Transport Simulation

scholarly journals Evidence for cosmic ray modulation in temperature records from the South Atlantic Magnetic Anomaly region

2013 ◽  
Vol 31 (10) ◽  
pp. 1833-1841 ◽  
Author(s):  
E. Frigo ◽  
I. G. Pacca ◽  
A. J. Pereira-Filho ◽  
P. H. Rampelloto ◽  
N. R. Rigozo
Keyword(s):  
Magnetic Anomaly ◽  
Southern Oscillation ◽  
Regional Scale ◽  
Sunspot Cycle ◽  
Cosmic Ray ◽  
Galactic Cosmic Rays ◽  
South Atlantic ◽  
Solar Variability ◽  
Maximum Temperature ◽  
The South

Abstract. Possible direct or indirect climatic effects related to solar variability and El Niño–Southern Oscillation (ENSO) were investigated in the southern Brazil region by means of the annual mean temperatures from four weather stations 2 degrees of latitude apart over the South Atlantic Magnetic Anomaly (SAMA) region. Four maximum temperature peaks are evident at all stations in 1940, 1958, 1977 and 2002. A spectral analysis indicates the occurrence of periodicities between 2 and 7 yr, most likely associated with ENSO, and periodicities of approximately 11 and 22 yr, normally associated with solar variability. Cross-wavelet analysis indicated that the signal associated with the 22 yr solar magnetic cycle was more persistent in the last decades, while the 11 yr sunspot cycle and ENSO periodicities were intermittent. Phase-angle analysis revealed that temperature variations and the 22 yr solar cycle were in anti-phase near the SAMA center. Results show an indirect indication of possible relationships between the variability of galactic cosmic rays and climate change on a regional scale.

Conjugate F-Region Enhancement Related to the South Atlantic Magnetic Anomaly

Radio Science ◽  
1968 ◽  
Vol 3 (7) ◽  
pp. 680-687
Author(s):  
C. P. Pike ◽  
John R. Herman ◽  
G. J. Gassmann
Keyword(s):  
Magnetic Anomaly ◽  
South Atlantic ◽  
The South ◽  
F Region

scholarly journals Equatorial aurora: the aurora-like airglow in the negative magnetic anomaly

2020 ◽  
Vol 7 (10) ◽  
pp. 1606-1615
Author(s):  
Fei He ◽  
Yong Wei ◽  
Weixing Wan
Keyword(s):  
Magnetic Anomaly ◽  
Systematic Investigation ◽  
Energetic Particles ◽  
South Atlantic ◽  
Upper Atmosphere ◽  
Impact Excitation ◽  
The South ◽  
South Atlantic Anomaly ◽  
Near Earth Space ◽  
Excitation Mechanisms

Abstract The most fantastic optical phenomena in the Earth's upper atmosphere are the auroras. They are highly informative indicators of solar activity, geomagnetic activity, upper atmospheric structures and dynamics, and magnetospheric energetic particles. An area where the geomagnetic field differs significantly from the expected symmetric dipole, such as at the South Atlantic Anomaly, where the magnetic field intensity is low, gives rise to stronger precipitation of energetic particles into the upper atmosphere. Impact excitation and the subsequent airglow emissions exhibit aurora-like dynamic signatures. Nomenclatures of nonpolar aurora or equatorial auroras are similar to those used with the polar auroras owing to their similar excitation mechanisms. This paper provides an overview of the knowledge and the challenges concerning auroral activity at the South Atlantic Anomaly, or more generally, at the negative magnetic anomaly. We emphasize systematic investigation of the equatorial auroras to reveal the temporal and spatial evolution of the magnetic anomaly and the behaviour of energetic particles in near-Earth space.

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