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International Space Station Photo
ISS006-E-18372
Following are enhanced versions of
International Space Station photograph ISS006-E-18372.
Note:
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Photo Credits: All original photos credit Image
Science and Analysis Laboratory/NASA-Johnson Space Center. All enhanced
photos credit Image Science and Analysis Laboratory/NASA-Johnson Space
Center/GoneToPlaid. Abbreviated Photo Credits: Original photos credit
NASA/ISD/JSC. All enhanced photos credit NASA/ISD/JSC/GoneToPlaid
Image
ISS006-E-18372 |
Image Data:
Caption |
What do auroras look like from
space? From the ground, auroras dance high above clouds, frequently causing
spectacular displays. The International Space Station (ISS) orbits just at the
same height as many auroras, though. Therefore, sometimes it flies over them,
but also sometimes it flies right through. The auroral electron and proton
streams are too thin to be a danger to the ISS, just as clouds pose little
danger to airplanes. ISS Science Officer Don Pettit captured a green aurora,
pictured above in a digitally sharpened image. From orbit, Dr. Pettit reports,
changing auroras can appear to crawl around like giant green amoebas. Far
below, on planet Earth, the Manicouagan Impact Crater can be seen in northern
Canada. |
Identification |
Mission: |
ISS006 Roll: E Frame: 18372 Mission ID on the
Film or image: ISS006 |
Country or Geographic Name: |
CANADA-Q |
Features: |
AURORA BOREALIS, MANICOUAGAN RESERVOIR |
Center Point Latitude: |
50.5 Center Point Longitude: -69.5 (Negative
numbers indicate south for latitude and west for longitude) |
Stereo: |
(Yes indicates there is an adjacent picture of
the same area) |
ONC Map ID: |
JNC Map ID: |
Camera |
Camera Tilt: |
High Oblique |
Camera Focal Length: |
58mm |
Camera: |
N1: Nikon D1 |
Film: |
2000E : 2000 x 1312 pixel CCD, RGBG imager
color filter. |
Quality |
Film Exposure: |
(not available) |
Percentage of Cloud Cover: |
25 (11-25) |
Nadir |
Date: |
20030118 (YYYYMMDD)GMT Time: 074040
(HHMMSS) |
Nadir Point Latitude: |
46.5, Longitude: -55.5 (Negative numbers
indicate south for latitude and west for longitude) |
Nadir to Photo Center Direction: |
West |
Sun Azimuth: |
81 (Clockwise angle in degrees from north to
the sun measured at the nadir point) |
Spacecraft Altitude: |
206 nautical miles (382 km) |
Sun Elevation Angle: |
-37 (Angle in degrees between the horizon and
the sun, measured at the nadir point) |
Orbit Number: |
3762 |
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The original
image. |
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The first image
processing step is to apply a salt and pepper filter in order to remove all of
the cosmic ray hits onto the Nikon D1 camera's CCD sensor. |
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Next, the image is
deconvolved, using the Lucy-Richardson image deconvolution method, in order to
sharpen all of the actual stars and in order to reveal the fainter stars which
are nearly buried by the background noise of the image. |
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Next, the image is
rotated 180° so that north on the earth is located on a bearing which is
oriented in some direction towards the top side of the image. After all, we
know that aurora start at the earth's poles and extend downward towards more
temperate latitudes if the solar storm is particularly strong. |
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Next, we apply a FFT
transform to the image and then clean up the FFT in order to reduce the faint
slanted noise pattern, visible in the above image, which is created when the
Nikon D1 reads out its CCD sensor. Note that only moderate FFT cleanup is
performed since we do not want to accidentally destroy any faint stars. |
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The final image,
cleaned up and enhanced a bit for visual presentation and in order to more
clearly show the star field that was actually recorded in the original
image. |
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The final image
above, but further enhanced, which should allow one to identify the actual star
field. |
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