RFM Flags

10DEC17
Index: ABS AVG BBT BFX BIN CHI CIA CLC COO CTM DBL FIN FLX FOV FVZ GEO GHZ GRA GRD HOM
HYD ILS JAC JTP LAY LEV LIN LOS LUN LUT MIX MTX NAD NEW NTE OBS OPT PRF PTH QAD
RAD REJ REX RJT SFC SHH SHP TAB TPS TRA V42 VRT VVW WID WNG ZEN


Flags are 3-character codes entered in the *FLG section of the RFM Driver Table. The presence of the Flag enables a particular option, its absence disables it. See under each Flag for more details.

Output Selection

The following Flags control the RFM output files.
FlagDescription
ABS Write Absorption spectra
BIN Write output spectra as binary files
BBT Write Brightness Temperature spectra
COO Write Cooling Rate spectra
DBL Write spectra with Double Precision
GHZ Spectral units GHz rather than cm-1.
JAC Write Jacobian spectra
JTP Jacobian spectra for tan. pt. perturbations only Available from RFM v4.34 onwards
LEV Intermediate outputs at specified levels
LOS Write Pointing Jacobian spectra
LUN Re-use Logical Unit Numbers for output spectra Discontinued RFM v5.0 onwards
NEW Open output files as 'NEW'
OPT Write Optical Depth spectra
PRF Write out internal profile
PTH Write Ray Path diagnostics
RAD Write Radiance spectra
RJT Write Rayleigh-Jeans Temperature spectra Available from RFM v4.3 onwards
SHH Suppress terminal progress messages Available from RFM v4.33 onwards
TAB Write tabulated absorption coefficients
TRA Write Transmission spectra
WID Write Widemesh diagnostics

Special Physics

The following Flags apply non-standard physical processes
FlagDescription
CHI Include Chi-factor for CO2 lines Available from RFM v4.33 onwards
CTM Include Continuum absorption
CIA Include Collision-induced absorption Available from RFM v4.34 onwards
MIX Include Line-mixing
MTX Matrix output (with Flux calculations)
NTE Use non-LTE calculations
QAD Quadratic fit for line wings
REX Include Rayleigh extinction Available from RFM v4.33 onwards
SHP Use non-Voigt line shapes
VVW Apply VVW correction to line shapes

Convolutions

The following Flags apply convolutions to output spectra
FlagDescription
AVG Spectrally averaged output
FOV Convolve with field-of-view
FVZ Treat FOV function as representing refracted altitudes rather than projected altitudes
ILS Convolve with instrument line-shape

Approximations

The following Flags control numerical approximations
FlagDescription
CLC Calculate absorption coefficients for every path segment
FIN User-specified fine mesh resolution
GRD Use Irregular Grid for calculations
LUT Use Look-Up Tables for Absorption Coefficients
REJ Ignore weak lines
TPS Use tabulated TIPS functions Discontinued RFM v5.0 onwards
V42 Use RFM v4.28 assumptions Available from RFM v4.3 onwards Discontinued RFM v5.0 onwards
WNG Use far-wing cut off for lines Discontinued RFM v5.0 onwards

Ray Paths

The following Flags control the ray paths and viewing geometry
FlagDescription
BFX Use Planck v. optical depth in layers
CRV User-specified Local Radius of Curvature Discontinued RFM v4.32 onwards
FLX Flux-type calculations (over solid angle)
GEO Use geometric (cf.refracted) ray paths
GRA Assume horizontal gradients (2D atmosphere)
HOM Perform Homogeneous path calculation
HYD Assume hydrostatic eqlbm to derive CG paths for plane parallel atmosphere Available from RFM v4.32 onwards (automatic in earlier versions)
LAY Automatic sub-layering of profiles
LIN Assume VMR varies linearly with altitude
NAD Nadir-viewing
OBS Specify Observer Location
SFC Specify surface characteristics
VRT Flux-type calculations without solid-angle integration
ZEN Zenith-viewing