  Solar Energetic Particles (SEP) are an integral part of the physical
processes related with Space Weather. We present a review for the acceleration
mechanisms related to the explosive phenomena (flares and/or CMEs) inside the
solar corona. For more than 40 years, the main 2D cartoon representing our
understanding of the explosive phenomena inside the solar corona remained
almost unchanged. The acceleration mechanisms related to solar flares and CMEs
also remained unchanged and were part of the same cartoon. In this review, we
revise the standard cartoon and present evidence from recent global MHD
simulations that supports the argument that explosive phenomena will lead to
the spontaneous formation of current sheets in different parts of the erupting
magnetic structure. The evolution of the large scale current sheets and their
fragmentation will lead to strong turbulence and turbulent reconnection during
solar flares and turbulent shocks. In other words, the acceleration mechanism
in flares and CME-driven shocks may be the same, and their difference will be
the overall magnetic topology, the ambient plasma parameters, and the duration
of the unstable driver.
