Change in water production rate 250 days before and after perihelion sorted by regions, as defined by El-Maarry et al. (2016). The first panel shows the results from the six southernmost regions, Anhur, Geb, Bes, Sobek, Neith, and Wosret. The largest production rates are found here, specifically from the Bes, Wosret, and Neith regions. The second panel contains the results from four regions located around –30° latitude: Atum, Anubis, Khonsu, and Imhotep. These show reasonable outgassing rates (as high as ~ 9 × 1027 molec s-1) and Imhotep in particular is well sampled in this time frame. Six regions that straddle the equator are in the third panel: Ap, Anuket, Maftet, Bastet, Khepry, and Aker. These is an apparent drop here in the production rate around perihelion as we start to look at more northern regions. Seth, Ash, Aten, Babi, and Hapi − the five northernmost regions – are in the fourth panel. Even though these regions do not receive much solar flux due to the rotation axis of the comet, Seth and Ash are still quite active. The remaining five regions, Hathor, Hatmehit, Ma’at, Nut, and Serqet are all located on the head lobe and shown in the fifth panel. The average daily solar flux for each region is shown underneath for comparison.
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