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Collimation of cometary dust jets and filaments

Keller, H. U.; Knollenberg, J.; Markiewicz, W. J.

It has been suggested that cometary dust jets, as for example imaged by the Halley Multicolour Camera (HMC), possibly originate from vents, or crater-like surface features. Dust flow emitted from such indentations is collimated if compared to emission from a flat surface. Dust liberated from the bottom of a cometary "crater" emerges at the surface…