The FLUKA package makes use of a density vs. height profile of atmosphere. An external program containing a functional fit to this profile has been used to generate at the same time an input geometry file, together with the data cards for material description (each atmospheric layer, having its proper density, needs to be assigned a different FLUKA material). The geometry produced, and distributed with the name atmogeo.cards is a spherical representation of the whole Earth atmosphere. The material definitions and assigment contained in the file atmomat.cards correspond to the density profile of the U.S. Standard atmosphere. The cards contained in atmomat.cards shall be included by the user in her/his input file. In addition, the user can specialize this geometry to a given geomagnetic latitude and longitude with the help of the atmloc_2011.f auxiliary program. In this way, the geometry will contain only a slice of the atmosphere, centered on the given position. The local geometry file produced by atmloc_2011.f} is named atmloc.geo. The user shall rename this geometry file for further use. More auxiliary files are produced by atmloc_2011.f: the file atmlocmat.cards contain additional material assignments to be included in the input together with the ones from atmogeo.cards; the file atmloc.sur contains data used by FLUKA runtime, and normalization areas.
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