Which exospheric temperatures are being shown in the Tinf column of the S2K_output.txt file?
In all versions except for v2.21 these are the daytime average exospheric temperature. They are not the subsolar point temperature as has been reported earlier since a cos(72) (72 deg is the angle between local atmosphere normal vector and the Sun-line vector) is used in the physics-based 1DTD model. This angle was selected because the 1DTD temp- eratures and neutral densities for 1976-200 (SC21REFW) and 1979-050 were very close to the MSIS-86 output for those dates. In addition, this angle provides an average daytime exospheric temperature for 6 years (Jan 1 1996 – Dec 31 2001) that is 1.3 times the J70 nighttime minimum exospheric temperature for the same period. The 1-sigma variation about this average temperature is +/-6.4%. Altogether, these point to a self-consistent exospheric temperature for input spectral solar flux. 1DTD does not use the E10.7 integrated irradiance proxy but uses the 39 wavelength groups and lines that are common in aeronomy. In v2.21, a conversion was applie
