Fig. 13
From: Performance of Akatsuki/IR2 in Venus orbit: the first year
Disk-integrated 2.02-μm fluxes plotted as a function of time. Two images, separated by 4 h, are acquired each day. The two measurements are extremely consistent with each other such that they are indistinguishable for May 21 and 22. The day-to-day variation originates from the solar phase dependence (so-called phase curve) and spatial/temporal variation of cloud-top altitudes