a) COPS data, spacecraft footpoint, and comet position for the period between 18–21 October, 2014 (noon till midnight). The bottom panel shows the distance to the nucleus center, r67P, and the heliocentric distance, rSun. The second panel from the bottom shows latitude and longitude, and above are phase angle and local time, LT. The top panel shows the measured COPS densities. The two reported intervals are indicated in blue (winter hemisphere at negative latitude, 19 October 2014 00:39:25–01:22:18) and red (summer hemisphere at positive latitude, 20 October 2014 07:53:51–08:37:45). Both observations occur at approximately the same longitude and at a phase angle of 90°. b) and c) show the illumination conditions as seen from the Rosetta spacecraft during the observations above the winter hemisphere on 19 October 2014 and above the summer hemisphere on 20 October 2014.
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