Fig. 9
Top: ROSINA/COPS neutral density nn not corrected for neutral composition (solid line) and sub-spacecraft latitude (dashed line). Bottom: photoionization (blue solid line) and electron-impact ionization (red circles) frequencies, derived from TIMED-SEE solar flux at the Earth and extrapolated to the comet 67P and from RPC-IES electron intensities, respectively (see Galand et al. 2016).
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