More on a possible modulation barrier in the outer heliosphere

The new concept of a possible modulation barrier in the outer heliosphere is discussed further. It is argued that since barrier-type modulation is characterized by large radial gradients in the outskirts of the heliosphere, while they remain almost constant in the rest of the heliosphere, it is already contained in drift and in terminal shock acceleration models. Combined with the expected coalescence of transients at large radial distances this may contribute to a very effective modulation barrier at large radial distances.