1. Analysis of L1b files with restituted attitude Bianca M. Dinelli E. Papandrea

2. L1b files with pointing information coming from the satellite restituted attitude have been provided The spectra contained in the L1b files previously delivered are compared with the new ones Examined orbits: –12963 (Reduced Resolution) –10600 (Full Resolution)

3. 12963 (RR 17 limb views per scan) Old: MIP_NL__1PTETB20040822_163350_00005 5582029_00384_12963_0000.N1 New: MIP_NL__1P_12963-RES_ATT.04822

4. Tangent points location

5. Old – New (sweep 8)

6. Old – New (sweep 9)

7. Old – New (sweep 10)

8. Old – New (sweep 11)

9. Orbit 10600 of 10/3/2004 full resolution (0.025cm -1 ) 17 sweep per scan Old: tangent points information as in the L1b file delivered via tape New: tangent points information coming from satellite restituted attitude

10. L1B files of Orbit 10600 Old: MIP_NL__1PPDPA20040310_144033_0000 38662025_00025_10600_2930.N1 New: MIP_NL__1P_10600-RES_ATT.040310

11. Comparison of Old and New spectra (Seq: 14 - Limb 6)

12. Old – New – Band A

13. GMTR analysis The spectra of the two L1-b files have been analyzed with the GMTR system Pressure, Temperature O 3 and H 2 O VMR have been simultaneously retrieved Retrieval performed at the nominal altitudes of the Occupation Matrix (same in the two analyses) Note that pointing is NOT retrieved (LOS as in L1-b files)

14. GMTR analysis  -test evolution Old:  -test = 504 - 20.06 - 2.34 - 2.13 - 2.11 New:  - test = 542 - 20.06 - 3.46 - 2.40 - 2.46 BUT: some sweeps in the new file are flagged as corrupted while previously they were fine

15. Corrupted sweeps in orbit 10600

16. Old spectrum of Band A – flagged as corrupted in new file

17. Old spectrum of Band AB – flagged as corrupted in new file

18. Tangent points location

19. OLD NEW GMTR retrieval

20. OLD NEW

21. GMTR retrieval OLD NEW

22. GMTR retrieval OLD NEW

23. GMTR retrieval OLD NEW

24. GMTR retrieval OLD NEW

25. GMTR retrieval OLD NEW

26. GMTR retrieval OLD NEW

27. Conclusions L1b spectra differences > noise Forward and Reverse sweeps show different behavior New tangent point locations lower than previous ones New algorithm flags corrupted apparently good sweeps New retrieved profiles smoother that before