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Fig. 6

image

Scatter plots of the actual (left panels) and mid-point-inferred (right panels) first-skip turning points for the grid of rays fired from (−60, 0) Mm with frequency 4 mHz (top) and 3 mHz (bottom). Points (actually) in the umbra are identified with green colouring, the penumbra with red, and the quiet Sun with blue. The green and red circles are the umbral and penumbral boundaries, respectively. These figures use ωc = ωDG; scattering with ωc = ωI is typically substantially increased.

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