Figure 4

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Figure 4. Clementine mosaic of the south pole region of the moon showing area sampled on orbit 234.The white outline indicates the nominal area at the time of peak RCP response on orbit 234, as shown in Fig. 3. The limits of this area are defined by contours of constant Doppler shift of the received signal and the RF terminator on an idealized spherical moon. The spread of Doppler shift was chosen to maximize the fraction of permanently shadowed ground in the area sampled. On the actual moon, the true boundaries are irregular, owing to topography, and the fraction of the sampled area occupied by permanently shadowed ground probably is higher than in the idealized case.

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©1996 by The American Association for the Advancement of Science.