Why 3-dimensional atmospheric neutrino calculation ?
Study of the Effect to the neutrino oscillation analysis.
Theoretical interests, or `Challenge'.

Calculation Setup
Fast simulation code with inclusive interaction model based on DPMJET3.
IGRF 2000 geomagnetic model.
Primary Cosmic ray model based on Gaisser et al. ICRC2001.
Injection height = 100km.
Simulation Radius = Re + 300km, Re +3000km, or 10xRe.
Back tracing with escape radius = 10xRe, for cutoff test.

The number of cosmic ray simulated so far,
Before cutoff (> 1 GeV) : 27,916,727,925
Injected in air                 : 10,535,000,000      
Equivalent time              : 7.32143E-09 sec