RFM Flags

BBT Flag: Write Brightness Temperature Spectra


Create .bbt files containing brightness temperature spectra, i.e. the temperature [K] of the Planck Function that gives the equivalent spectral radiance.

No brightness temperature spectra written

Incompatible with TAB Flag.

  1. Internally the RFM calculates radiance, these are converted to brightness temperature [K] at the output stage (subroutine wrtout.for) using the inverse of the Planck function, i.e:
             BBT = c2ν / ln ( 1 + c1ν3 / RAD ) 
    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], RAD is the radiance [nW/(cm2 sr cm-1)].
  2. See also the Rayleigh-Jeans Temperature, which is closely related to BBT, and converges as ν → 0.
  3. See RFM Outputs for default filename(s).

[no recent bugs]