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The Rosetta probe around comet 67P/Churyumov-Gerasimenko (67P) reveals ananisotropic dust distribution of the inner coma with jet-like structures. Thephysical processes leading to jet formation are under debate, with most modelsfor cometary activity focusing on localised emission sources, such as cliffs orterraced regions. Here we suggest, by correlating high-resolution simulationsof the dust environment around 67P with observations, that the anisotropy andthe background dust density of 67P originate from dust released across theentire sunlit surface of the nucleus rather than from few isolated sources. Wetrace back trajectories from coma regions with high local dust density in spaceto the non-spherical nucleus and identify two mechanisms of jet formation:areas with local concavity in either two dimensions or only one. Pits andcraters are examples of the first case, the neck region of the bilobed nucleusof 67P for the latter one. The conjunction of multiple sources in addition todust released from all other sunlit areas results in a high correlationcoefficient (~0.8) of the predictions with observations during a completediurnal rotation period of 67P.

On the origin of inner coma structures observed by Rosetta during a diurnal rotation of comet 67P/Churyumov-Gerasimenko