Follow this link to skip to the main content
NASA Jet Propulsion Laboratory California Institute of Technology
JPL - Home Page JPL - Earth JPL - Solar System JPL - Stars and Galaxies JPL - Science and Technology
Bring the Universe to You: JPL Email News JPL RSS Feed JPL Podcast JPL Video
MISR - Multi-angle Imaging SpectroRadiometer
  Gallery  
 Home
 Mission
 Get Data
 Gallery
Latest MISR Imagery
A Collection of MISR Imagery
Suggest an Image
MISR Instrument
AirMISR Instrument
AIrMISR Flight Imagery
 News and Events
 Publications
 FAQs
 Ask a Question
 About Us
 Other Resources
 Internal
A Collection of MISR Imagery
Stars and Stripes
Larger image

Stars and Stripes
03/29/2000

On 12 February 2000, before the cover of the Multi-angle Imaging SpectroRadiometer (MISR) opened for the first time, some "dark current" data was acquired to assess instrument performance. The image at left represents 41 seconds of data taken during a passage through the South Atlantic Anomaly (SAA), a region of Earth's upper atmosphere having a high concentration of charged particles. The bright points are signals created by these particles, which are mostly protons. About 1 pixel in 1000 is affected by the random "hits", a rate that drops to about 1 in a million outside the SAA, as had been expected.

The image at right contains the same data but with the contrast greatly enhanced. In addition to the "salt and pepper" pattern, random, dark horizontal stripes appear. When a proton creates a signal, it can trigger the camera video circuitry to temporarily darken the background level. This shows up as a stripe. The brightness of these stripes is typically less than 0.5% above the average background level with the camera cover closed.

<< RETURN TO GALLERY