Hemi"Sphere"

Boundary Conditions

1 AU = 1 Astronomical Unit = distance between Earth and Sun

p = prescribed on outer curved surface (Dirichlet)
radius = 90 AU

dp/dn = 0 on flat surface (von Neumann: "natural" B.C.)

p = 0 on inner curved surface (Dirichlet)
radius = 0.1 AU (very small => invisible !)

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