Last version:
FLUKA 2021.2.2, September 25th 2021
(last respin )
flair-2.3-0b 30-Jul-2021


-- Fluka Release
( 25.09.2021 )

FLUKA 2021.2.2 has been released.
Fluka Release 30.07.2021 FLUKA 2021.2.1 has been released.
Fluka Major Release 18.05.2021 FLUKA 2021.2.0 has been released.
Congratulations from INFN: ,
Dear Paola,
I wish to congratulate you and all the authors and collaborators for this new Fluka release, which looks at the future and confirms the support of INFN in the development and continuous improvement of this code.
best regards
Diego Bettoni
INFN Executive Committee

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Initialises Galactic Cosmic Ray or Solar Particle Event calculations


     WHAT(1) = i0 + 1000 * i1
               i0 = 0: centered dipole field, geomagnetic coordinates
                       (used also for computing rigidity cut-off's
                        in the spectrum generating routine)
                  = 1: exact multipole fields, geographic coordinates
                  = 2: undefined, standard MAGFLD user routine called for
                       regions with magnetic field
                  = 3: dipolar field for infinite plane at given latitude
                  > 3: undefined, standard MAGFLD user routine called for
                       regions with magnetic field
               i1 = number of atmospheric shells (see Note 2)
                  = 10000: no atmospheric shells
                  = 51 :  50 atmospheric shells (not supported)
                  = 101: 100 atmospheric shells
                  = 201: 200 atmospheric shells (not supported)
               Default: centered dipole field, 100 shells

     WHAT(2) = not used

     WHAT(3) = not used

     WHAT(4) = Earth radius (Default provided)

     WHAT(5) = Earth equatorial magnetic field (Default provided)

     WHAT(6) = not used

     SDUM =    name identifying both the spectra files (estension .spc) 
               and the data file (estension .sur) produced  by the 
               auxiliary program atmloc_2011.f  (see Note 2).

     Default (command GCR-SPE not given): no GCR/SPE calculation.


  • 1) Cosmic ray calculations, initialised by GCR-SPE, are defined by means of command SPECSOUR and a number of auxiliary programs. Details are presented in Chap. (16)

  • 2) The cards for the geometry description of the atmospheric shells must be prepared using the auxiliary programs and datacards in the directory $FLUPRO/gcrtools. Program Atmloc_2011.f writes a file atmloc.geo, containing the geometry input to be inserted into the FLUKA input file (or to be read by setting WHAT(3) GEOBEGIN card), a file containing the extra material assignments, and a file atmloc.sur containing auxiliary data and the scoring areas. The user shall rename the file atmloc.sur to <xxxxxxx>.sur, where <xxxxxx> is an identifier of exactly 7 characters which must appear also in the input spectra file names: the spectra must have the names <zz><xxxxxxx>.spc, where <zz> is the atomic number of the primary. The example spectra distributed with FLUKA come with two identifiers: <zz>phi0465 for solar minimum and <zz>phi1440 for solar maximum, and with zz=01-28.

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