The status of CPOS and the ionosphere at 22:05 UT on 24th October. Upper left: from RTIM: vertical total electron content, assuming an ionosphere layer at 350 km altitude. Upper right: from RTIM: ROTI in the ionosphere, assuming an ionosphere layer at 350 km altitude. Lower left: from RTIM: the average ROTI observed by ground receivers. Lower right: from CPOS: the ratio of solved satellites versus tracked satellites, where pure green is 100% solved, pure yellow is 70% solved and pure red is 0% solved. The scale is linear between each color. There is one colored circle per station, and the size of the circle is proportional to the number of tracked satellites, so there will be no symbol drawn for a station which does not track any satellites.