~25 cubes for full limb coverage A minimum of 3 (north,equat,south) x 2 (dawn, dusk) positions. Limb observation from the night side also possible with lesser conflicts with nadir surface observations with the main goal to monitor plume spatial structure (high solar phase angle). Synergy with JANUS. High phase angle constraints are the most meaningful for plume observations
any rule that is used to schedule the observation: repetition rules, continuous (plasma instruments), one-off, every orbit, every day, etc