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The concept of energetic particle reservoirs, essentially based on theassumption of the presence of outer reflecting boundaries/magnetic mirrors ordiffusion barriers (deterministic) rather than on the effect of particlediffusive propagation (stochastic) in magnetic turbulence, has been used fordecades to describe the space-extended decay phases of energetic particleevents within the fields of space physics, solar physics, and plasma physics.Using five-dimensional time-dependent Fokker-Planck transport equationsimulations, in this work we demonstrate that the so-called particle reservoirsare naturally explained and quantitatively reproduced by diffusion processes inturbulent magnetic fields, without invoking the hypothesis of reflectingboundaries. Our results strongly suggest that the so-called "reservoir" (basedon deterministic structure) should be renamed "flood" (based on stochasticdiffusion), which symbolizes an authentic shift in thinking and in pragmaticrationale for the studies of energetic particles and relevant plasma phenomenain heliophysics and in astrophysics.

New Insight into the Formation Mechanism of the Energetic Particle Reservoirs in the Heliosphere