Fig. 3
From: Capability of airline jets as an observation platform for noctilucent clouds at middle latitudes
Temporal and longitudinal variation of NLCs detected by jets and the CIPS instrument onboard the AIM satellite. The vertical and horizontal axes represent days from north hemispheric summer solstice (DFS) in 2019 and longitudes, respectively. Red crosses and black plus symbols show the locations and times of NLC observations conducted by jets. As in Fig. 3, red crosses mean that NLCs were detected “from” these points, but plots are limited to latitudes lower than 55°N. The blue plus and gray plus symbols represent NLCs detected from space by the AIM/CIPS instrument. The horizontal width of grey lines roughly corresponds to the zonal distance of a foot print of CIPS camera in at latitude 55°N. All sampling points by AIM/CIPS between latitudes 50°N and 60°N are shown in this plot.