RJT Flag

RFM Flags: Rayleigh-Jeans Temperature Spectra

04APR24
Enabled
Output Rayleigh-Jeans temperature spectra, i.e. the temperature [K] of the Planck Function that gives the equivalent spectral radiance in the long wavelength regime.

Disabled
No Rayleigh-Jeans temperature spectra.

Restrictions
Incompatible with TAB Flag.

Notes
  1. Internally the RFM calculates radiance R. This is converted to Rayleigh-Jeans temperature TRJ [K] at the output stage (subroutine spcout_sub.f90) using the formula
    TRJ = c2 R / ( c1 ν2)
    where c1,c2 are the radiation constants, approx 1.191E-3 nW/(cm2 sr (cm-1)4) and 1.439 K/cm-1 respectively (actual values in phycon_dat.f90), ν is the wavenumber [cm-1], R is the radiance [nW/(cm2 sr cm-1)].
  2. The Rayleigh-Jeans Temperature is the approximation to the Brightness Temperature calculation assuming that c1 ν3 / R ≪ 1, i.e., using the Rayleigh-Jeans approximation that Temperature and Radiance are linearly related (appropriate in microwave region).
  3. See RFM Outputs for default filename(s).

Bugs
[none reported]