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This is also a very simple program (sharing some code with dispersive) to compute the atmospheric absorption due to dry and wet components of the atmosphere.
This program will be a part of AATM-0.06 examples when this version is released. AATM is freely available here under the GPL licence (see file COPYING).
There is an option to pass both the altitude of the site (–altitude) and the pressure at the ground level (–gpress) to the program. The altitude value is however only used to determine the temperature structure of the atmosphere at the site and you must also adjust the ground pressure to the correct value of the site to get sensible results.
Example of use:
./absorption --freq 50 --ghum 1
Freq Dry Opac Wet Opac
50 0.119802 0.000145611
Invoking the help option:
./absorption --help
Compute absorption by the atmosphere
This program is part of AATM version 0.09
GPL license -- you have the right to the source code. See COPYING
Allowed options:
--help Produce this help message
--freq arg Frequency at which to compute the absorption (GHz)
--fmin arg The starting frequency (GHz) of a frequency grid
(incompatible with --freq)
--fmax arg The end frequency (GHz) of a frequency grid
(incompatible with --freq)
--fstep arg The frequency step (GHz) of a frequency grid
(incompatible with --freq)
--ghum arg Relative humidity at ground level (percent) (currently
incompatible with --freq)
--pwv arg Precipitable water vapour in mm (incompatible with
--ghum)
--altitude arg (=5000) Altitude of the site (m)
--gpress arg (=560) Ground level pressure (mBar)
--gtemp arg (=270) Ground level temperature (K)
--wvl arg (=2) Water vapour scale height (km)
--tlr arg (=-5.6) Tropospheric lapse rate (K/km)