Table 1. GOES-8/9 sounder noise performance compared to GOES-7 VAS and NOAA-12 HIRS. NEDR is the inflight measured noise equivalent radiance in mW/m2/ster/cm-1; spec is the prelaunch specified value. NEDT is the corresponding inflight measured noise equivalent temperature at 290 K; GOES-8 NEDT can be inferred by multiplying GOES-9 NEDT by NEDR(G-8)/NEDR(G-9). Improvements over GOES 7 and NOAA-12 include adjustments for FOV differences.
 
   
                        NEDT                 NEDR                   Improvement ratio
                     __________ ____________________________    _______________________
Wavelength              G-9     G-8           G-9     (spec)       G9/G7   G-9/N-12 


   (um)        Ch      (290K)          (mW/m2/ster/cm-1)            (FOV adjusted)        
                                                                                       

                                                                                    

Longwave                                                                        

14.7           1        0.75    1.63          1.20    (0.66)          7.7   1.2        
                                                                                       

14.4           2        0.49    1.41          0.80    (0.58)          5.6   1.3        
                                                                                       

14.1           3        0.36    0.94          0.56    (0.54)          2.5   1.2        
                                                                                       

13.9           4        0.28    0.65          0.46    (0.45)                1.0        
                                                                                       

13.4           5        0.27    0.74          0.45    (0.44)          3.1   0.9        
                                                                                       

12.7           6        0.12    0.32          0.19    (0.25)          5.9              
                                                                                       

12.0           7        0.08    0.21          0.13    (0.16)                           
                                                                                       

                                                                                

Midwave                                                                         

11.0           8        0.07    0.15          0.10    (0.16)          1.3   2.1        
                                                                                       

9.7            9        0.07    0.20          0.11    (0.33)                2.9        
                                                                                       

7.5            10       0.09    0.091        0.076    (0.16)                5.6        
                                                                                       

7.0            11       0.07    0.091        0.047    (0.12)          25.0  8.3        
                                                                                       

6.5            12       0.15    0.119        0.086    (0.15)          3.0              
                                                                                       

                                                                                

Shortwave                                                                       

4.57           13       0.09    0.012        0.008    (0.013)               1.6        
                                                                                       

4.52           14       0.08    0.011        0.007    (0.013)         7.7   1.1        
                                                                                       

4.45           15       0.08    0.012        0.006    (0.013)         11.1  1.4        
                                                                                       

4.13           16       0.08    0.004        0.003    (0.008)                          
                                                                                       

3.98           17       0.10    0.005        0.003    (0.008)         4.8   1.4        
                                                                                       

3.7            18       0.05    0.002        0.001    (0.004)               2.1

FOV sizes: GOES-8/9 at 8 km; GOES-7 at 7 km (14 km for the more extreme longwave and shortwave); HIRS at 17 km

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