12-20 July 2017
BEXCO
Asia/Seoul timezone
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Contribution

BEXCO - Room C(108)

[SH159] 3-D galactic cosmic ray anisotropy: 1965-2017

Speakers

  • Renata MODZELEWSKA

Primary authors

Co-authors

  • Michael ALANIA (Institute of Math and Physics, Siedlce University, Poland; Tbilisi State University, Tbilisi, Georgia)

Description

We study features of the three dimensional (3D) galactic cosmic ray (GCR) solar anisotropy for 1965-2017 (almost 5 solar cycles 20-24). We reveal periodic oscillations connected with the rotation of the Sun (~ 27 days). We analyze the first (~27 days), second (~13 days) and third (~9 days) harmonics of the 27-day variation of the (1) two dimensional (2D) GCR anisotropy in the ecliptic plane, and (2) north-south anisotropy (A_{t}) normal to the ecliptic plane. We study the dependence of the first three harmonics of the 27-day variation of the 3D GCR anisotropy on the solar cycle and solar magnetic cycle. 3D anisotropy vector was obtained based on the neutron monitors and muon telescopes data. Derivation of the GCR anisotropy components is based on harmonic analyses and spectrographic methods of the hourly data of cosmic ray intensity. A diurnal (24-hours) variation of the GCR intensity is corrected for the influence of the Earth magnetic field. We use Fourier transform to study quasi-periodic character related to the Sun rotation (~27-days). Moreover north-south component of the GCR anisotropy is derived based on the GG index calculated as the difference in GCR intensities from various directions of multidirectional Nagoya muon telescope.