12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room F(201/202/203/204)

[SH150] Diffusion/Convection of Cosmic Rays in Near-earth Space and Variation of Solar Wind Velocity

Speakers

  • Akitoshi OSHIMA

Primary authors

Co-authors

  • H. TAKAMARU (College of Engineering, Chubu University, Japan)
  • S. SHIBATA (College of Engineering, Chubu University, Japan)
  • L.V. REDDY (Tata Institute of Fundamental Research, India)
  • B.S. RAO (Tata Institute of Fundamental Research, India)
  • S. OGIO (Graduate School of Science, Osaka City University, Japan)
  • P.K. NAYAK (Tata Institute of Fundamental Research, India)
  • S.D. MORRIS (Tata Institute of Fundamental Research, India)
  • H. KOJIMA (Faculty of Engineering, Aichi Insitute of Technology, Japan)
  • S. KAWAKAMI (Graduate School of Science, Osaka City University, Japan)
  • A. JAIN (Tata Institute of Fundamental Research, India)
  • V.B. JHANSI (Tata Institute of Fundamental Research, India)
  • P. JAGADEESAN (Tata Institute of Fundamental Research, India)
  • Y. HAYASHI (Graduate School of Science, Osaka City University, Japan)
  • B. HARIHARAN (Tata Institute of Fundamental Research, India)
  • S.K. GUPTA (Tata Institute of Fundamental Research, India)
  • S.R. DUGAD (Tata Institute of Fundamental Research, India)
  • A. CHANDRA (Tata Institute of Fundamental Research, India)
  • K.P. ARUNBABU (Tata Institute of Fundamental Research, India)
  • S. AHMAD (Aligarh Muslim University, India)
  • K. TANAKA (Hiroshima City Univeristy, Japan)
  • M. ZUBERI (Tata Institute of Fundamental Research, India)
  • THE GRAPES-3 COLLABORATION ()

Description

The convection term in diffusion/convection theory of cosmic rays could be treated one dimensionally, namely, as a radial component/vector from the Sun. In simplified model, cosmic ray intensity variation observed by ground based detectors in the frame of solar time must be a result of summation of a convection vector and a diffusion vector, namely, a co-rotation vector. We extracted amplitudes of the co-rotation vector utilizing the muon data of GRAPES-3 large area muon detector and classified them according to the strength of the solar wind velocity to study a relationship between them. In this presentation, the relationship between the amplitudes of cosmic ray solar time variation and the solar wind velocities will be reported and the estimated magnitudes of convection vector will be discussed.