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  The PAMELA orbital characteristics, combined to its possibility to determine the incoming direction, latitude and longitude of charged particles over a large energy range  (80 MeV up to several hundreds GeV), gives it the  great opportunity to investigate on the stationary and disturbed fluxes of high energy particles in the Earth radiation belts, especially while it is crossing the South Atlantic anomaly

Pamela is able to perform the measurement of the content of electrons, positrons, protons and antiprotons  in the radiation belts in a wide energy range. It also detects non trapped particles coming from  cosmic ray interaction with the atmosphere.


In addition, the study of temporal and spatial fluctuations of proton and electron fluxes in the radiation belts is carried out. These fluctuations could be connected to solar and magnetic activity, or to Earth activity like, for example, seismic processes and formation of typhoons.


Separate measurements of the fluxes of electrons and positrons in this energy range could give a significant improvement in confirming the existence of effective processes of particle acceleration in the magnetosphere or in finding evidence for other generation processes. 


Motion of trapped particles
Motion of trapped particles

 

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Edited by Vincenzo Buttaro