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Figure 1 | Earth, Planets and Space

Figure 1

From: The spatial density gradient of galactic cosmic rays and its solar cycle variation observed with the Global Muon Detector Network

Figure 1

Long-term variations of three components of the anisotropy vector in the solar wind frame. Each panel displays the yearly mean (a) ξ (on the left vertical axis), (b) ξ , and (c) ξ z as defined in Equation 2c, each as a function of year on the horizontal axis. Solid and open circles in each panel represent anisotropies derived from the GMDN and Nagoya data, respectively, while open squares in (a) display cosψ on the right vertical axis. In each panel, yearly mean value and its error are deduced from the average and dispersion of monthly mean values. Gray vertical stripes indicate periods when the polarity reversal of the solar polar magnetic field (referred as A>0 or A<0 in (b)) is in progress.

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