am is a tool for radiative transfer computations at microwave to submillimeter wavelengths. Spectra which can be computed with am include thermal emission, absorption, transmission, and excess delay. The program can modify computed spectra to model the response of spectrometers and receiving systems. Measured spectra can be fitted using a simple scheme for flagging model parameters as fit variables.

The primary application area for am is in radio astronomy, involving terrestrial propagation paths between ground and sky, but the program can also be applied to a variety of other radiative transfer problems.

Download the latest version (am 5.2).

SMA memo #152 is the manual for am. (An updated manual will be out ~Mar 2008.)

Browse the am cookbook for examples of am configuration files.