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USHAS.TXT
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1990-12-12
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MAGELLAN/VENUS IMAGE USHAS.GIF
This Magellan image shows an area 40 by 112 kilometers (25 by
70 miles) to the northeast of Ushas Mons on Venus. It was obtained
on September 16, 1990 when the spacecraft was on its 384th orbit of
the planet. This image shows evidence of possible explosive
volcanism and eolian or wind activity. The image shows two types
of plains: fractured and smooth. The smooth plains in the center
of the image appear to overlay the fractured plains. Extending
from the one kilometer (0.6 mile) diameter crater in the middle of
the image is a radar-bright fractured surface which broadens away
from the crater. It is brighter near the crater and fades
gradually into smooth plains at its distal end 10 kilometers (6
miles) from the crater. A similar but darker deposit extends away
from the crater to the left. These streaks are interpreted to form
due to the scouring away of the smooth plains deposit by the wind,
revealing the fractured plains below. The smooth plains deposit
and the craters may have formed by fallout from volcanic explosion
plumes. Their characteristics are typical of terrestrial
pyroclastic volcanic deposits. Resolution of the Magellan data is
about 120 meters (400 feet).