Abstract
The sidereal anisotropy of cosmic rays with energy in the range of 10 14 – 10 15 eV was obtained by using Large Area Air Show (LAAS) experiments which deployed extensive air shower (EAS) arrays in large part of Japan. The first harmonic amplitude and phase in a function of right ascension axis are ( 0.23 ± 0.04 ) × 10 −2 and 0.4 ± 0.7 hour, respectively, and those of the second harmonics are ( 0.06 ± 0.04 ) × 10 −2 and 7.5 ± 2.6 hour, respectively. The first harmonic amplitude are compared with the diffusive mode of cosmic ray propagation, which predicts the dependence of anisotropy amplitudes on primary cosmic ray rigidities. The exponent value of rigidity dependence of diffusion coefficient is estimated as 0.34 ± 0.01 , in good agreement with Kolmogorov type spectrum of turbulence of galactic magnetic filed. Although a sky map in equatorial coordinates indicates excess and deficit regions above the isotropic expectation, their deviations were consistent with statistical ones, and more statistics are required to point the region and the opening angle of them.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.