Fig. 1

Geometry of solar occultation measurements and the analysis method in this study (modified from Fig. 4 of Vandaele et al. 2008). In the ingress case depicted here, the instrument is taking a measurement every second. The tangent altitude \( h_{tg, j} \) defines the layers in the atmosphere. In each layer \( L_{i} \), the temperature \( T_{i} \) and pressure \( P_{i} \) are assumed to be constant