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GOES-15 replaces GOES-11 as the operational GOES-West satellite

goes-15-replaces-goes-11-as-the-operational-goes-west-satellite

For all our readers that use satellite images CIMSS Satellite blog announced today that at 15:46 UTC on 06 December 2011, GOES-15 replaced GOES-11 as the operational GOES-West satellite. GOES-11 (launched in 2000, and operational since 2006) was one of the older GOES-I/J/L/K/M series of satellites, while GOES-15  (launched in 2010) is one of the newer GOES-N/O/P series of satellites — so there are some important differences that operational users of the imagery should be aware of:

  1. Improved water vapor channel (Imager channel 3)
  2. Slightly different visible channel (Imager chanel 1)
  3. 13.3 µm IR (Imager channel 6) replaces the 12.0 µm  IR (Imager channel 5)
  4. Improved Image Navigation and Registration (INR)
  5. Shorter image outages during Spring and Fall season “eclipse periods”
  6. Less noise on many of the Sounder channels

The improvement made to the GOES-15 Imager instrument water vapor channel is likely the most important change to operational users. In the sequence of AWIPS images above, the first 3 images are using the 8-km resolution GOES-11 6.7 µm channel as the source for GOES-West water vapor imagery, while the final 3 images use the 4-km resolution GOES-15 6.5 µm channel. Note the change to slightly warmer/drier water vapor brightness temperatures (brighter yellow color enhancement) after the changeover to GOES-15. In addition, notice that the north-south “seam” joining the GOES-West and GOES-East water vapor channel images disappears, since the characteristics of the water vapor channels are identical on those two satellites.

In the sequence of AWIPS images below, the first 2 images are using the GOES-11 Sounder instrument 6.5 µm channel as the source for GOES-West water vapor imagery, while the final 2 images use the GOES-15 Sounder 6.5 µm channel. Note the improvement in noise seen in the Sounder instrument water vapor images after the changeover to GOES-15. Since the 3 GOES Sounder water vapor channels are a component of the GOES Sounder Total Precipitable Water derived product imagery, the quality of that product should also improve.

In terms ofthe visible imagery, a similar comparison using GOES-11 (the first 3 images) vs GOES-15 (the final set of 3 images) Imager visible channel data is seen below (during a test on 29 November). Immediately obvious is the fact that the GOES-15 visible channel imagery appears “brighter” than the GOES-11 visible channel imagery — this is due to the fact that the performance of the GOES visible detectors degrades over time (GOES-11 was launched in 2000, and became the operational GOES-West satellite in 2006). The 0.63 µm visible channel on GOES-15 is also slightly different than the 0.65 µm visible channel on GOES-11, as is discussed in the “GOES-13 is now the operational GOES-East satellite” CIMSS blog post. GOES-15 is similar to GOES-13, since it is part of the GOES-N/O/P series of spacecraft.

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