The goal of this study is to examine the response and changes of the muon intensity at ground , due to magnetic anomaly over south Atlantic .
Based on the data of two directional muon telescopes and located at 22S and 43W .
These coordinates are inside of the South Atlantic Anomaly ( SAA ) region , a dip in the magnetosphere .
This characteristic offers to the muon telescopes the lowest rigidity of response to cosmic protons and ions ( \geq 0.4 GV ) .
The magnetosphere ’ s dip is responsible for several processes , such as the high conductivity of the atmospheric layers due to the precipitation of energetic particles in this region and an zonal electric field known as the pre-reversal electric field ( PRE ) with an enhancement at evening hours .
In addition the open magnetosphere , propitiate the magnetic reconnections of the IMF lines that will take place in this site in the day side .
These factors are responsible for an unusually large particle flux present in the SAA region , including particles with energies above the pion production threshold .
The main effect is an increase of the muon intensity ( E _ { \mu } > 0.2 GeV ) at ground , in the day side , in up to ten times .
We show that it is correlated with the pre-reversal electric field , and propitiate the observation of muon enhancements due to small solar transient events , such as corotating interaction region ( CIR ) and micro-flares .
Details of these results are reported in this paper .