Otherwise, an additional small factor nr\nn appears in the attractive force due to neutral bombardment.
The precursor is in fact confined by the continuous bombardment of plasma from the radial streams.
We assume that the ionized states in the cloud due to cosmic ray bombardment are low.
These estimates are based upon the commonly considered degree of ionization due to cosmic-ray bombardment.
A special section of this paper is devoted to the role of dust-surface cooling on the dust-dust interaction caused by neutral bombardment.
The infantry was hesitant to advance under air cover, instead preferring to move in after the bombardment had expired.
The bombardment force, as has been shown by numerical simulation [2], can then exceed the electrostatic forces.
The physical reason for the attraction is the force of bombardment of electrons and ions which leads to dust charging.
