アブストラクト：
In this study, we try to clarify the physical mechanisms of the global spatial structure and uniformity of the gamma-ray surface brightness of FB. The magnetic field and cosmic ray diffusions may play central role to determine these characteristics. As it has been widely known, the magnetic and cosmic ray diffusion coefficients in comic plasmas differ from the microscopically expected values and have been treated as unknown key parameters. Therefore, we are willing to study how the structure of the FB responds to magnetic and cosmic ray diffusion coefficients by performing 3D MHD simulation in which magnetic and cosmic ray diffusions are explicitly taken into account. For this purpose, we have developed a new HLL and HLLD RMHD codes in which the cosmic diffusion are simultaneously solved.