CERN homepage INFN homepage
FLUKA: 16.1.1} The All-Particle Spectrum Previous Index Next

16.1.1} The All-Particle Spectrum

 The ion composition of the galactic flux is derived from a code [Bad96]
 which considers all elemental groups from Z = 1 to Z = 28. The spectrum is
 modified to follow recent data sets (AMS [Alc00,Alc00a] and BESS [San00] data
 of 1998) up to 100 GeV according to the so-called ICRC2001 fit [Gai01].
 The spectrum components are written into 28 files. The name of the files
 has the form (Z+phi+<PhiMV>+.spc). The first two
 characters of each file name are the atomic number of a different primary
 spectrum ion (e.g. 01:protons, 02:alpha...). They are followed by the
 solar modulation parameter used for generating the spectrum (7 characters)
 and by an extension ".spc".
 The ".spc" files are spectra without geomagnetic cutoff. The ".spc"
 files are used together with an analytical calculation of the rigidity cutoff,
 according to a centered dipole approximation of the Earth geomagnetic field,
 adapted to result in the vertical cutoff inserted into the input file
 (SPECSOUR command, 
of the continuation card), at the geomagnetic latitude and longitude of interest.

Previous Index Next