  The temporal evaluation of the 27-day variation of the three dimensional (3D)
galactic cosmic ray (GCR) anisotropy has been studied for 1965-2014. 3D
anisotropy vector was obtained based on the neutron monitors and Nagoya muon
telescopes data. We analyze the 27-day variation of the (1) two dimensional
(2D) GCR anisotropy in the ecliptic plane, and (2) north-south anisotropy
normal to the ecliptic plane. Studying the time line of the 27-day variation of
the 2D GCR anisotropy, we confirm that the average amplitude in the minimum
epoch of solar activity is polarity dependent, as it is expected from the drift
theory. The amplitude in the negative polarity epochs is less as we had shown
before. The feeble 11-year variation connected with solar cycle and strong
22-year pattern connected with solar magnetic cycle is visible in the 27-day
variation of the 2D anisotropy for 1965-2014. We show that the 27-day variation
of the GG index (being a measure of the north-south asymmetry) varies in
accordance to solar cycle with a period of 11-years, being in good agreement
with the 27-day variation of the At component of the GCR anisotropy calculated
by the IZMIRAN group. Detailed analysis are presented for the solar minimum
2007-2008 of solar cycle no.23 and solar maximum 2013-2015 of solar cycle no
24. In the solar cycle no. 24 GG index, calculated by Nagoya telescopes data,
is highly anticorrelated with By component of the interplanetary magnetic field
(IMF) and shows a clear recurrent changes related to the Sun's rotation.

Solar and Stellar Astrophysics;High Energy Astrophysical Phenomena;Space Physics