EP 8.2: DPG, Berlin - March 7, 2005 The Huygens Doppler Wind Experiment: Initial Results Michael Bird (Radiostronomisches Institut, Universität Bonn) And.

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Presentation transcript:

EP 8.2: DPG, Berlin - March 7, 2005 The Huygens Doppler Wind Experiment: Initial Results Michael Bird (Radiostronomisches Institut, Universität Bonn) And the DWE Team

7 March EP 8.2: DPG, Berlin DWE Concept Goal: In situ determination of zonal wind speed along Huygens descent path Approach: Record Doppler effect on Huygens carrier signal => radial velocity Input parameters: 1.Huygens descent speed, meridional speed 2.Huygens starting position 3.Cassini position & velocity

7 March EP 8.2: DPG, Berlin Huygens Descent Paths on Titan

7 March EP 8.2: DPG, Berlin DWE Hardware TUSO on Huygens Probe RUSO in Huygens Receiver on Cassini Ultra-stable Oscillators (USOs)

7 March EP 8.2: DPG, Berlin Huygens Doppler: PCO#1 TUSO/RUSO TCXO/TCXO 3 hours

7 March EP 8.2: DPG, Berlin No power!

7 March EP 8.2: DPG, Berlin DWE from Earth: Geometry Huygens antenna pointed only ~30° from Earth Better SNR than for Galileo Probe detection at Jupiter Probe velocity projection in direction to Earth nearly antiparallel to projection in direction to Orbiter  20º

7 March EP 8.2: DPG, Berlin Huygens Radio Tracking Net 10:18 UTC-GRT12:30 UTC-GRT

7 March EP 8.2: DPG, Berlin Huygens VLBI Network Facility Start UTCStop UTCComment GBT09:31:1012:15:00 DWE: Real time RSR detection VLBA Fort Davis09:31:1013:45:00 VLBA North Liberty09:31:1013:15:00 VLBA Owens Valley09:30:0914:49:14DWE: No nodding – on Titan continuously VLBA Pie Town09:30:1114:15:04DWE: No nodding – on Titan continuously VLBA Los Alamos09:31:1014:00:00 VLBA Brewster09:31:1014:48:00 VLBA Kitt Peak09:31:1014:15:00DWE VLBA Mauna Kea09:31:1016:00:00DWE Parkes12:26:2316:00:00DWE: Real time RSR detection Hobart11:13:1016:00:00 Ceduna10:13:1016:00:00 Mopra10:10:1016:00:00 Kashima09:31:1016:00:00 Shanghai10:01:1016:00:00 Urumqi11:31:1016:00:00Calibration only, no Huygens signal at 2040 MHz ATCA10:01:1016:00:00Calibration only, no Huygens signal at 2040 MHz Onsala19:01:1022:15:00 Wettzell21:46:1022:15:00

7 March EP 8.2: DPG, Berlin GBT Parkes

7 March EP 8.2: DPG, Berlin 10:18:10 UTC-GRT GBT just noise

7 March EP 8.2: DPG, Berlin GBT Huygens! (~ -171 dBm) Flux density  125 Jy 10:18:15 UTC-GRT

7 March EP 8.2: DPG, Berlin Huygens Frequency: GBT + Parkes

7 March EP 8.2: DPG, Berlin Huygens Frequency: GBT + predicts

7 March EP 8.2: DPG, Berlin Huygens Frequency: Parkes + Predicts predicted impact

7 March EP 8.2: DPG, Berlin Parkes: Huygens Impact on Titan

7 March EP 8.2: DPG, Berlin Zonal Wind Retrieval Doppler shift: Error Analysis:

7 March EP 8.2: DPG, Berlin GBT (1) Raw Doppler (2) Only Huygens Motion (3) Huygens Descent Velocity (4) Huygens Horizontal Velocity Doppler Components

7 March EP 8.2: DPG, Berlin

7 March EP 8.2: DPG, Berlin

7 March EP 8.2: DPG, Berlin DWE: Preliminary Results Zonal winds above boundary layer are PROGRADE Low-velocity layer between km –Stong positive/negative wind shear –‘Unexpected’, but evident in some GCMs Considerable turbulence above 100 km Near surface winds are weak (~ 1-2 m/s)