We present the first full-sky analysis of the cosmic ray arrival direction
distribution with data collected by the HAWC and IceCube observatories in the
Northern and Southern hemispheres at the same median primary particle energy of
10 TeV. The combined sky map and angular power spectrum largely eliminate
biases that result from partial sky coverage and holds a key to probe into the
propagation properties of TeV cosmic rays through our local interstellar medium
and the interaction between the interstellar and heliospheric magnetic fields.
From the map we determine the horizontal dipole components of the anisotropy
$delta_{0h} = 9.16 imes 10^{-4}$ and $delta_{6h} = 7.25 imes
10^{-4}~(pm0.04 imes 10^{-4})$. In addition, we infer the direction
($229.2pm 3.5^circ$ RA , $11.4pm 3.0^circ$ Dec.) of the interstellar
magnetic field from the boundary between large scale excess and deficit regions
from which we estimate the missing corresponding vertical dipole component of
the large scale anisotropy to be $delta_N sim -3.97 ^{+1.0}_{-2.0} imes
10^{-4}$.
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