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CERES Instruments in Cross-Track Scan Mode



There are two CERES instrument onboard both the Terra and Aqua satellites. One is typically in cross-track mode and the other in either the RAPS (Rotating Azimuth Plane Scan) or FAPS (Fixed Azimuth Plane Scan) mode. The cross-track instrument is recommended by the CERES Science Team since the spatial distribution of footprints is uniform.
Also over time, the instrument in RAPS mode has increased spectral darkening of the transmissive optics.

Click here link to external site for examples of instrument scanning spatial sampling.

The tables list the recommended cross-track instrument (Terra FM1 or FM2, Aqua FM3 or FM4) for each month.

Terra Satellite
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2000     FM2 FM2 FM1 FM1 FM1 FM2 FM2 FM2 FM1 FM1
2001 FM1 FM2 FM2 FM2 FM1 FM1 FM1 FM2 FM2 FM2 FM1 FM1
2002 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1
2003 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1
2004 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1
2005 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1
2006 FM2 FM2 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1
2007 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1 FM1
2008 -
present
FM1 will be in cross-track mode indefinitely.
Any changes will be posted here.


Aqua Satellite
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
2002             FM4 FM4 FM4 FM4 FM3 FM3
2003 FM3 FM4 FM4 FM4 FM3 FM3 FM3 FM4 FM4 FM4 FM4 FM4
2004 FM4 FM4 FM4 FM4 FM4 FM4 FM4 FM4 FM4 FM4 FM4 FM4
2005 FM4 FM4 FM4 FM3 FM3 FM3 FM3 FM3 FM3 FM3 FM3 FM3
2006 FM3 FM3 FM3 FM3 FM3 FM3 FM3 FM3 FM3 FM3 FM3 FM3
2007 FM3 FM3 FM3 FM3 FM3 FM3 FM3 FM3 FM3 FM3 FM3 FM3
2008 -
present
FM3 will be in cross-track mode indefinitely.
Any changes will be posted here.

Note: Aqua FM4 instrument experienced a SW instrument failure on March 30, 2005.


CERES Data Product Information

 
  Image: NASA Logo NASA Official: Dr. Norman Loeb
Page Curator: Edward Kizer
Page Last Modified: 10/16/2017 11:04:36 EST
Site Last Modified: 11/07/2017 17:18:43 EST