Temperature Retrievals Using Solar Refraction Angles
an occultation event, solar rays are refracted by the
atmosphere towards higher densities (see Figure 1).
Because the refraction angle is directly related
atmospheric density profile, measured refraction angles can be
retrieve temperature profiles. Profiles of atmospheric refraction angle
determined from the SOFIE sun sensor with sub-arcsec precision, and
subsequently used to retrieve temperature versus altitude with a high
and vertical resolution. This basic
approach was pioneered using Global Positioning
data. A retrieval based on simulated SOFIE refraction angle
measurements is shown in Figure 2. These results suggest that
SOFIE refraction angle temperatures will have better than 2 K accuracy
at altitudes below 50 km.
Figure 1. Bending of solar rays during an occultation.
Figure 2. Temperature retrieval using simulated refraction angle measurements from the SOFIE sun sensor.