Fig. 2

image

Regions containing Spot 1 (left) and Spot 2 (right) in the COMSOL mesh as used for numerical simulations. The surface is colored according to solar irradiance at the respective MIRO observation time. The gray cones are the rays from the Sun to the spot centers during one cometary rotation; the yellow straight line refers to MIRO observation time. The black straight line points toward the spacecraft. Spot 1 is about 1 km long, and Spot 2 about 3 km (vertical extension in figure).

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