RFM Flags: Calculate Brightness Temperature Spectra
BBT Flag



10SEP22
 Enabled
 Calculate brightness
temperature spectra, i.e. the temperature [K] of the Planck Function
that gives the equivalent spectral radiance.
 Disabled
 No brightness temperature spectra written
 Restrictions
 Incompatible with TAB Flag.
 Notes
 Internally the RFM calculates radiance R,
which is converted to brightness
temperature T [K] at the output stage (subroutine spcout_sub.f90) using the
inverse of the Planck function, i.e:
T = c_{2} ν / ln ( 1 +
c_{1} ν^{3} / R )
where c_{1}, c_{2} are the radiation constants, approx
1.191E3 nW/(cm^{2} 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/(cm^{2} sr cm^{1})].
 See also the RayleighJeans Temperature,
which is closely related to BBT, and converges as ν → 0.
 See RFM Outputs for default
filename(s).
 Bugs
 [no recent bugs]