2009 Fiscal Year Final Research Report

The study of nonlinear phenomena observed in the arrival time series of cosmic rays

Research Project

Project/Area Number	19540301
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Particle/Nuclear/Cosmic ray/Astro physics
Research Institution	Kochi University
Principal Investigator	OHMORI Nobuharu Kochi University, 教育研究部自然科学系, 教授 (10117004)
Co-Investigator(Kenkyū-buntansha)	HONDA Ken 山梨大学, 医学工学総合研究部, 教授 (10115321) NAKAMURA Tooru 高知大学, 教育研究部自然科学系, 准教授 (90243815)
Project Period (FY)	2007 – 2009
Keywords	宇宙線
Research Abstract	The existence of groups of cosmic rays, whose arrival time distribution shows chaotic character, has been reported. To confirm the existence of such phenomena ,we analyzed high frequency air shower data with more rigorous energy criterion and more suitable non-linear method As the result, we could not find the chaotic ones and all sequences of cosmic rays seems to be random ones ,except few candidates with fractal behavior. But, this conclusion depends only on data observed with a single air shower array, and is not free from analytical methods. Our new experiment, two separated air shower arrays which observe cosmic rays at the same time, will find the clear evidence of such group of cosmic rays with non-linear characters.

(3 results)