1 SOFIE Performance, CBE as of 22 November 2006

GATS

SOFIE signal changes due to FOV drift using spacecraft pointing reduces SNR margins

Chan.Band / Target

Center Wavelength

(m)

V SNR Required / CBE

Margin (random)

Worst case induced V uncertainty (quasi-systematic in noise units) 12 arc-sec drift in any direction

from lockdown at 2.5 arcmin*

Margin after RSS of

random + systematic

11 / O3 s 0.291

1.0e4 / 210.9 0.08 12.82 / O3 w 0.330

23 / PMC s 0.867

1.0e6 / 5.9 1.79 0.64 / PMC w 1.04

35 / H2O w 2.46

2.5e4 / 16.6 0.02 15.76 / H2O s 2.62

47 / CO2 s 2.79

3.0e5 / 1.4 0.19 1.38 / CO2 w 2.94

59 / PMC w 3.06

1.0e5 / 3.0 0.16 2.710 / PMC s 3.12

611 / CH4 s 3.38

4.0e5 / 1.3 0.23 1.312 / CH4 w 3.48

713 / CO2 s 4.32

4.0e5 / 1.5 0.17 1.514 / CO2 w 4.65

815 / NO w 5.01

3.0e5 / 0.9 0.26 0.916 / NO s 5.32

*Lockdown was moved within a radius of 2.5 arcmin and the signal change for 12 arcsec drift (over 10 / seconds / 25 km) was calculated. Numbers shown are the worst case for all possible lockdowns. Note: the drift induced dV signal uncertainty is the error in the corrected signal considering a regression to the signal change vs FOV drift, the measurement noise (from calibration), and the pointing error (from calibration).

This analysis captures all of the errors and is our CBE.

2 SOFIE Performance, CBE as of 22 November 2006

GATS

Geophysical Parameter Precision

Required / SMA Margin / Rigid Mirror Margin

Altitude Range, km

Required / Current

Vertical Resolution, km

Required / Current

NIR cloud extinction* 5x10-6 km-1 / 5.9 / 0.6 78 – 85 / 75 – 90 3 / 1.5

IR cloud extinction 5x10-5 km-1 / 3.0 / 2.7 78 – 85 / 75 – 90 3 / 1.5

temperature 5 K / 1.5 / 1.4 70 – 90 / 15 - 95 3 / 1.5

O3 mixing ratio 0.1 ppmv / 50 / 12.8 78 – 90 / 15 - 105 3 / 1.5

H2O mixing ratio 0.6 ppmv / 17 / 14.0 78 – 90 / 15 - 100 3 / 1.5

CO2 mixing ratio 10 ppmv / 1.5 / 1.4 80 – 100 / 15 - 100 3 / 1.5

CH4 mixing ratio 0.05 ppmv / 1.3 / 1.3 30 – 90 / 15 - 90 3 / 1.5

NO mixing ratio 107 cm-3 / 0.9 / 0.9 80 – 95 / 80 - 110 5 / 3

Horizontal and temporal resolution requirements are met

*This measurement is not an AIM Level 1 science requirement

Predicted SOFIE performance meets or exceeds Level 1 science requirements

3 SOFIE Performance, CBE as of 22 November 2006

GATS

SOFIE H2O retrieval simulation

Retrievals in the presence of clouds

SOFIE H2O Measurement performance

Required Current Best Estimate (Margin)

Signal to Noise 2.5 104 4 105 (16)

Retrieval Precision (83 km) 0.6 ppmv 0.043 ppmv (14)

Retrieval Altitude Range 79 – 90 km 15 – 100 km