RFM Flags

BBT Flag: Write Brightness Temperature Spectra

07NOV18

Enabled
Create .bbt files containing 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
  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).

Bugs
[no recent bugs]