Scenarios for the origin of GCR. A) GCR originate from the interstellar medium (ISM) and are accelerated from the forward shock (FS) of SN. B) GCR originate from the interior of supernovae and are accelerated by the reverse shock (RS), propagating inwards. C) GCR originate from superbubble (SB) material, enriched by the metals ejected by supernovae and massive star winds; they are accelerated by the forward shocks of supernovae and stellar winds. D) GCR originate from the wind material of massive rotating stars, always rich in CNO (but not in heavy nuclei) and they are accelerated by the forward shock of the SN explosion.
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