The discovery and detection of ultra high energy cosmic rays (UHECRs) of energy up to 10 DEGREES20 eV have posed a serious challenge to the astrophysicists about their origin as well as the physical acceleration mechanisms. Some theoretical approaches in the past assuming elastic scatterings of cosmic charged particles with magnetic clouds then developed by assuming the presence of shock waves originated from supernova remnant succeeded to explain the existence of energies up to 10 DEGREES15 eV. The assumption of particle-electromagnetic field interaction with constant fields succeeded to...