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tokens: This work was supported by INFN and ASI under ASI-INFN Agreement No.2014-037-R.0. M.S.P. and E.E.V. acknowledge partial financial support from the the South African National Research Foundation (NRF) under their Research Cooperation Programme. E.E.V. thanks the Space Science Division of the South African Space Agency (SANSA) for partial financial support during his PhD studies. R.M. acknowledges partial financial support from The Italian Space Agency (ASI) under the program “Programma PAMELA—attivita” scientifica di analisi dati in fase E.” The authors would like to thank Dr. M. Boezio for the useful discussion and helpful suggestions. Part of this work is based on archival data provided by the ASI Science Data Center (ASDC).