1. North-south anisotropy of galactic cosmic rays observed with the Global Muon Detector Network 34 th ICRC (August 4, 2015, Den Hague) SH07 ID117 K. Munakata a, M. Kozai a, C. Kato a, T. Kuwabara b, M. Rockenbach c, A. Dal Lago d, N.J. Schuch c, H. K. Al Jassar e, M. M. Sharma e, M. L. Duldig f, J. E. Humble f, J. W. Bieber g, P. Evenson g, I. Sabbah h and M. Tokumaru y a Shinshu Univ., b Chiba Univ., c CRS/INPE, d INPE, e Kuwait Univ., f Univ. of Tasmania, g Univ. of Delaware, h College of Health Sciences, i Nagoya Univ.

2. North-south anisotropy (NSA) The anisotropy vector is oppositely directed to the streaming vector. Laurenza+ 2003: GG-inferred daily mean IMF polarity matches with the direct measurement in overall 72 % of the analyzed period. The “success rate” can be 95 % in selected conditions, occurring for 30% of the time. Mori & Nagashima 1979

3.  Nagoya GG-component Eliminate the temperature effect by the subtraction between two directional channels with a common zenith angle. Two subtractions are averaged to eliminate the effect of cut-off rigidity difference. NSA by GMDN : coupling coefficients Nagashima 1971

4. Asymptotic viewing directions of GMDN 36 m 2 32 m 2 16 m 2 25 m 2 GMDN is described in Okazaki+ ApJ 682 2008 ☆ indicates the location of the detector. ○□ △ display the asymptotic viewing directions of median energy CRs corrected for the geomagnetic bending. Thin lines indicate the spread of viewing direction for the central 80 % of the energy response to primary CRs. Data available at… http://cosray.shinshu-u.ac.jp/crest/

5. Okazaki+ ApJ 681 2008 CR2043 (2006 May 8 to June 4). AAATT Count rate error~0.3%

6. Ecliptic plane Equatorial plane September March Equatorial plane

7. no. of days 1994~2014 Solar min. 2009 Solar max. 2000 - : 0.165% SDV: (0.319%) 0.078% (0.200%) 0.217% (0.386%) Toward Away Success rate ~ 70% if Gaussian

8. Toward Away Success rate SDV (%) year Toward Away Success rate SDV (%) year

9. Summary The NSAs observed with the GMDN and the GG- component are analyzed. We find for the first time a significant seasonal variation of NSA indicating the influence of the anisotropy component in the ecliptic plane. The temporal variations of the NSA observed with the GMDN and GG-component are consistent with each other. The T-A separation between average NSAs in each CR shows a solar cycle variation with minimum (maximum) around the solar activity minimum (maximum). The standard deviation in each CR also shows a similar variation, keeping the ”success rate” roughly constant.

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