New Small Comet Images--Atmospheric Holes
At the right is a raw, unprocessed image of a large
atmospheric hole taken with the Earth Camera on board the
Polar spacecraft at low altitudes. At bottom right is the
same image processed to account for cosmic rays and
non-uniform sensitivities of the sensor. The cosmic rays are
the bright spots in the image on the top. Note these bright
spots do not occur in the vicinity of the atmospheric hole
and thus the hole cannot be caused by the correction for
cosmic rays as a few critics have claimed.
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This large atmospheric hole is about 100 kilometers in
diameter and is much too large to be accounted for by a
camera malfunction. The superposed coastal map shows that the
hole occurs near the Mawson Coast of East Antarctica.
This image was taken at 11:45:39 UT on 5 September 1996 when
the Polar spacecraft was located at an altitude of 6,400
kilometers and geographic latitude and longitude of 65.9° S
and 52.6° E, respectively.
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All data and images are provided courtesy of Dr. Louis A. Frank at the
University of Iowa. Any use of these images must credit Dr. Louis A.
Frank, The University of Iowa and NASA.