July 29, 2015 to August 6, 2015
World Forum
Europe/Amsterdam timezone

Measurements of solar diurnal ansiotropy with GRAPES-3 experiment

Aug 4, 2015, 4:00 PM
1h
Theater Foyer (World Forum)

Theater Foyer

World Forum

Churchillplein 10 2517 JW Den Haag The Netherlands
Board: 2
Poster contribution SH-EX Poster 3 SH

Speaker

PRAVATA KUMAR MOHANTY (Tata Institute of Fundamental Research, Mumbai, India)

Description

Harmonics in the cosmic ray solar diurnal anisotropy up to third have been experimentally observed. Very high statistics is required to investigate higher harmonics because of exceedingly small amplitudes. The GRAPES-3 experiment located in Ooty, India contains a large area (560~m$^2$) tracking muon telescope that provides a high statistical record of the muon flux ($\sim$4$\times 10^9$ per day). This allows measurement of tiny variations in cosmic ray intensity ($\lt$0.01%) caused by various solar phenomena. After making appropriate corrections for the efficiency of the detector and atmospheric pressure variations, a continuous stream of one year data was used to investigate the diurnal anisotropy. A fast Fourier transform based analysis revealed clear presence of the first three harmonics as well as the fourth harmonic for the first time. Further, a clear rigidity dependence of each of the four harmonics was also obtained. These results will be presented during the conference.
Collaboration -- not specified --
Registration number following "ICRC2015-I/" 38

Primary author

PRAVATA KUMAR MOHANTY (Tata Institute of Fundamental Research, Mumbai, India)

Co-authors

Dr Akitoshi Oshima (College of Engineering, Chubu University, Kasugai, Aichi 487-8501, Japan) Mr Atul Jain (Tata Institute of Fundamental Research, Mumbai, India) Mr B. Hariharan (Tata Institute of Fundamental Research, Mumbai, India) Mr B.S. Rao (Tata Institute of Fundamental Research, Mumbai, India) Prof. H. Kojima (College of Engineering, Chubu University, Kasugai, Aichi 487-8501, Japan) Prof. H.M. Antia (Tata Institute of Fundamental Reseach, Mumbai) Prof. K. Tanaka (Faculty of Information Sciences, Hiroshima City University, Hiroshima 731-3194, Japan) Dr K.P. Arunbabu (Tata Institute of Fundamental Research, Mumbai, India) Mr P. Jagadeesan (Tata Institute of Fundamental Research, Mumbai, India) Dr P.K. Nayak (Tata Institute of Fundamental Research, Mumbai, India) Prof. Prasad Subramanian (Indian Institute of Science Education and Research, Sai Trinity Building, Pashan, Pune 411021, India) Prof. Saburo Kawakami (Graduate School of Sciences, Osaka City University, Osaka, Japan) Mr Samuel Morris (Tata Institute of Fundamental Research, Mumbai, India) Shashi Dugad (Tata Inst. of Fundamental Research (IN)) Prof. Shoichi Shibata (College of Engineering, Chubu University, Kasugai, Aichi 487-8501, Japan) Prof. Sunil Gupta (Tata Institute of Fundamental Reseach, Mumabi, India) Dr T. Nonaka (ICRR, Tokyo, Japan) Prof. Yoshio Hayashi (Graduate School of Sciences, Osaka City University, Osaka, Japan)

Presentation materials