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The Huygens Doppler Wind Experiment: Results from Titan Michael Bird (Radiostronomisches Institut, Universität Bonn) And the DWE Team EGU Vienna - April.

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Presentation on theme: "The Huygens Doppler Wind Experiment: Results from Titan Michael Bird (Radiostronomisches Institut, Universität Bonn) And the DWE Team EGU Vienna - April."— Presentation transcript:

1 The Huygens Doppler Wind Experiment: Results from Titan Michael Bird (Radiostronomisches Institut, Universität Bonn) And the DWE Team EGU Vienna - April 25, 2005

2 Vienna EGU, 25 April 2005 2 Huygens DWE The DWE Team M.K. Bird, R. Dutta-Roy, Y. Dzierma Radioastronomisches Inst., Univ. Bonn, Auf dem Hügel 71, 53125 Bonn, Germany M. Allison NASA Goddard Inst. for Space Studies, 2880 Broadway, New York, NY 10025, USA D.H. Atkinson Dept. of Elec. & Computer Engineering, Univ. of Idaho, Moscow, ID 83844, USA S.W. Asmar, W.M. Folkner, D.V. Johnston, R.A. Preston Jet Propulsion Laboratory, Caltech, 4800 Oak Grove Dr, Pasadena, CA 91109, USA P. Edenhofer Institut für HF-Technik, Universität Bochum, 44780 Bochum, Germany D. Plettemeier Elektrotechnisches Institut, Technische Univ. Dresden, 01062 Dresden, Germany G.L. Tyler Center for Radar Astronomy, Stanford University, Stanford, CA 94305, USA L.I. Gurvits, S.V. Pogrebenko, I.M. Avruch Joint Inst. for VLBI in Europe, P.O. Box 2, 7990 AA Dwingeloo, The Netherlands

3 Vienna EGU, 25 April 2005 3 Huygens DWE 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

4 Vienna EGU, 25 April 2005 4 Huygens DWE DWE Hardware TUSO on Huygens Probe RUSO in Huygens Receiver on Cassini Ultra-stable Oscillators (USOs)

5 Vienna EGU, 25 April 2005 5 Huygens DWE Cassini TCXO RUSO TCXO TUSO Channel B Channel A Earth “Channel C” Huygens Signal paths Huygens Data Huygens Receivers Huygens Probe

6 Vienna EGU, 25 April 2005 6 Huygens DWE 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 Vienna EGU, 25 April 2005 7 Huygens DWE Huygens Radio Tracking Net 10:18 UTC-GRT12:30 UTC-GRT GBT VLBA MK KP PTOV MK Parkes VLBA

8 Vienna EGU, 25 April 2005 8 Huygens DWE 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

9 Vienna EGU, 25 April 2005 9 Huygens DWE GBT Parkes

10 Vienna EGU, 25 April 2005 10 Huygens DWE GBT Huygens! (~ -171 dBm) Flux density  125 Jy 10:18:15 UTC-GRT 10 just noise

11 Vienna EGU, 25 April 2005 11 Huygens DWE Huygens Frequency: GBT + Parkes

12 Vienna EGU, 25 April 2005 12 Huygens DWE Huygens Frequency: GBT + predicts

13 Vienna EGU, 25 April 2005 13 Huygens DWE Huygens Frequency: Parkes + Predicts predicted impact

14 Vienna EGU, 25 April 2005 14 Huygens DWE Parkes: Huygens Impact on Titan

15 Vienna EGU, 25 April 2005 15 Huygens DWE Zonal Wind Retrieval Doppler shift: where = radial velocity between transmitter and receiver

16 Vienna EGU, 25 April 2005 16 Huygens DWE GBT (1) Raw Doppler (2) Only Huygens Motion (3) Huygens Descent Velocity (4) Huygens Horizontal Velocity Doppler Components

17 Vienna EGU, 25 April 2005 17 Huygens DWE Zonal Wind Velocity

18 Vienna EGU, 25 April 2005 18 Huygens DWE Zonal Wind Height Profile

19 Vienna EGU, 25 April 2005 19 Huygens DWE DWE: Preliminary Results Zonal winds above boundary layer are PROGRADE Huygens drifted 3.95º (~175 km) eastward Low-velocity layer between 60-100 km –Stong positive/negative wind shear –‘Unexpected’, but evident in some models Considerable turbulence above 100 km Near surface winds are weak (~ 1-2 m/s)

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