1. UPDATE ON THE ATMOSPHERIC DYNAMIC MISSION (ADM) Pierre H. FLAMANT ADM Advisory Group Working Group on Space-Based Lidar Winds Bar Harbor, Maine, 23-25 June, 2003

2. USEFUL CLARIFICATION Atmospheric Dynamic Mission is the 2nd Earth Explorer Mission selected in 1999 for a launch in 2007 Fully funded Satellite : ALADIN Instrument : ÆOLUS Project Manager : Peter Dubock Instrument Manager : Martin Endemann Most informations provided here were collected during the 7th ADMAG Meeting held 3-4 April, 2003 For an update, ADM-ÆOLUS is on the WEB via ESA portal : www.esa.int

3. HOW THINGS WORK AT ESA ESTEC ADM Mission Managment Advisory Group Industry Advice Studies Developments BOARD OF MINISTERS ESA

4. ALADIN ÆOLUS SATELLITE In 2007 … Wind Lidar using direct detection It is a High Spectral Resolution Lidar : the scattered light from molecules and particles are separeted by the receiver interferometer and processed independently i.e. two channels The Lidar single LOS looks at 35° from nadir and 90° from the direction of motion to cancelled the huge Doppler frequency shift associated to 7 km sec-1 velocity The wind horizontal velocity will be computed over 50 km at maximum

5. ISSUES AT BEGINNING & WORRIES Laser transmitter ! 150 mJ per pulse Single mode at 355 nm, 100 Hz, Burst mode –Two studies in parallel Mie Receiver : Two concepts in competition i.e. Fizeau or Two beam MZ-M interferometer –MZ-M Study Molecular lineshape : Brillouin doublet

6. Latest news from the Project i.e. Martin Endemann (1/2) The meeting in the US is a bit too early - we expect nice pictures to arrive for the PDR in September 2003 For the time being, we have only the pictures that I have showed at the previous 7th ADMAG, showing the overall configuration of ÆOLUS and the ALADIN spacecraft. It still is the most current design concept The receiving telescope is shown with a diameter of 1.5 m

7. Latest news from the Project i.e. Martin Endemann (2/2) A Laser consortium has been selected in a restricted competition. The Laser team is lead by Galileo Avionica (Pomezia and Firenze), with Quantel (Paris), CISE (Milano), TESAT (Stuttgart) and Thales Laser Diodes (Paris) as subcontractors The Mie receiver selected for further design analysis is the Mie receiver which has fewer engineering unknowns (i.e. Fizeau Interferometer) than the novel Two-beam Interferometer.

8. OVERVIEW Yellow cans : 2 star trackers Golden panel : Laser radiator connected to the 2 Laser heads In red : Heat pipes from Laser packages inside the ÆOLUS structure Grey : ÆOLUS structure The Receiver baffle is cut assy- metrically to reduce atmospheric drag Small yellow sticks are the com- munication antennas (to down link data & telemetry)

9. LAUNCHER SIDE

10. EARTH SIDE

11. MISSION IMPLEMENTATION : PHASE B STATUS Instrument Base Line Review in July 2003 : Prime contractor Astrium UK will review ÆOLUS Preliminary Design Review in September 2003 : ESA will review the status of the complete ALADIN satellite Beginning of Phase C/D in October 2003 All ÆOLUS is broken down in a bout 50 subsystems Most ÆOLUS subsystems are being procured in open competition (ITTs) Most of the subcontracts must be assignated to contractors by July 2003 Procurement packages need to be published on EMITS before

12. MISSION IMPLEMENTATION : MISSION STATUS ÆOLUS End-to-end Instrument Simulator. Kick- Off: Oct. 2003 Level 1B operational ground processor : near-real- time processing chain, additional modules for calibration. Kick-Off: Oct. 2003 ALADIN Ground segment (responsability : ESRIN) ALADIN Flight Operation segment (ESOC) ALADIN X band stations

13. MISSION IMPLEMENTATION : PRE-DEVELOPMENT MODEL Optical Bench delivered in Nov. 2002 Detection Electronics Units in Oct. 2002 Electrical Ground Support Equipment in Nov. 2002 Optical Ground Support Equipment to simulate atmospheric returns in March 2003 Accumulation CCDs in Dec. 2002 Dual Fabry-Perot Rayleigh Spectro. in Feb. 2003 Fizeau Mie Interferometer planned in April 2003 Detection Front-End Units planned in April 2003

14. MISSION IMPLEMENTATION : Assessement Test Program for Pump Laser Diodes Quasi CW Laser Diodes (Burst mode) –Two contracts : Thales, Dilas CW Laser Diodes (Seeder) –Two contracts : InnoLight, Ferdinand Braun Institute

15. MISSION IMPLEMENTATION : Laser Transmitter Breadboard Two contracts in parallel with Astrium GmbH & Galileo Avionica Laser breadboard to demonstrate energy level in UV (355 nm) Transportable Laser transmitter test bed to be integrated in the ÆOLUS PDM

16. MISSION IMPLEMENTATION : Airborne Demonstrator Astrium-DLR activity : see next talk by Oliver Reitebuch

17. SUPPORTING SCIENTIFIC STUDIES Measurement Error and Correlation Impact on the Atmospheric Dynamics Mission by KNMI ON GOING : –Expected benefits of DWL for Data Assimilation by ECMWF –Variational data assimilation in the tropics by MISU –High Impact Weather (1) by KNMI –High Impact Weather (2) by DWD

18. SUPPORTING SCIENTIFIC STUDIES PLANNED (in FALL 2003) : –Quality Control Methodology & Tools –Independent review of level 1B processor work –Maintenance & updating of ÆOLUS reference simulator –Level 2 wind processor algorithms (i.e. accoun- ting for atmospheric variables & lineshape, …) –Other level 2 data products (i.e. clouds & aerosols layers properties)

19. NOT YET (REALLY) DISCUSSED Data dissimination Post launch Validation activities Outreach …

20. MORE … Next ADMAG mid October 2003