In spherical coordinates, let aθ x aφ denote until vectors along the θ, φ directions. E = 100/r sinθcos(ωt - βr)aθV/m and H = 0.265/r sinθcos(ωt - βr) aφ A/m represent the electric and magnetic field components of the EM wave of large distances r from a dipole antenna, in free space. The average power (W) crossing the hemispherical shell located at r = 1km,0 ≤ θ ≤ π/2 is _______