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1993-07-13
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MAGELLAN PROJECT OFFICE
MIT ID: GSDRP.1;2
JPL ID: P-40144
Date: 5/4/92
These images display the meter-scale roughness of the Venus surface
(characterized by its root-mean-square average slope), as observed by
the Magellan radar altimeter. The lightest shades locate areas having
the steepest values of average slope, while darker shades indicate areas
that are smoother. The upper image shows that part of the planet
between 69 degrees north and 69 degrees south latitude in Mercator
projection; beneath it are the two polar regions covering latitudes
above 44 degrees in stereographic projection. Easterly longitudes run
across the Mercator map from left to right, and around the periphery of
the polar stereographic projections. Resolution of the surface varies
with spacecraft altitude, being about 10 kilometers near the equator and
degrading to as much as 25 kilometers at high latitudes. Black areas
indicate where data had not yet been obtained by Magellan after the
first eight months of operation.
There is a tendency for elevated regions, e.g. the Maxwell Montes (left
of the data gap at top center) and Aphrodite Terra (along the equator at
right), to show steeper meter-scale slopes than are typical of lower-
lying areas. The steeper slopes probably result from disruption of the
surface associated with tectonic activity in these regions. Note the
large 2300-kilometer (1400-mile) diameter circular feature (Artemis
Chasma) in the lower right of the Mercator image. This feature is
thought to have been caused by a gigantic plume of heated rock rising
from the planet's interior. The data shown here were analyzed and
projected at the Center for Space Research, Massachusetts Institute of
Technology.