hswt#29, florence february 28, 2005
DESCRIPTION
HSWT#29, Florence February 28, 2005. DWE: Initial Results Michael Bird (Radiostronomisches Institut, Universität Bonn) And the DWE Team. DWE data: Huygens Mission. Channel B. f. Channel A. f. df/dt. df/dt. 6 hours. 3.67 hours. No power!. DWE from Earth: Geometry. - PowerPoint PPT PresentationTRANSCRIPT
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HSWT#29, FlorenceFebruary 28, 2005
DWE: Initial Results
Michael Bird
(Radiostronomisches Institut, Universität Bonn)
And the DWE Team
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28 February 2005 2HSWT#29, Florence
DWE data: Huygens Mission
6 hours 3.67 hours
f f
df/dt df/dt
Channel A Channel B
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28 February 2005 3HSWT#29, Florence
No power!
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28 February 2005 4HSWT#29, Florence
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
0°
15°
30°
45°
60°
75°
-15°
-30°
-45°
-60°
-75°
Track ofSub-Earth
Point
Track of OrbiterProbe
180°210°240° 150° 120°
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28 February 2005 5HSWT#29, Florence
GBT Parkes
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28 February 2005 6HSWT#29, Florence
Huygens Radio Tracking Net
10:18 UTC-GRT 12:30 UTC-GRT
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28 February 2005 7HSWT#29, Florence
GRT
GBT Huygens!(~ -171 dBm)
Flux density: 125 Jy
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28 February 2005 8HSWT#29, Florence
GBT Detection
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28 February 2005 9HSWT#29, Florence
Watching Huygens from JPL
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28 February 2005 10HSWT#29, Florence
Huygens Frequency: GBT + Parkes
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28 February 2005 11HSWT#29, Florence
Huygens Frequency: GBT + predicts
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28 February 2005 12HSWT#29, Florence
Huygens Frequency: Parkes + Predicts
predictedimpact
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28 February 2005 13HSWT#29, Florence
Parkes: Huygens Impact on Titan
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28 February 2005 14HSWT#29, Florence
GBT
(1) Raw Doppler
(2) Only Huygens Motion
(3) Huygens Descent Velocity
(4) Huygens Horizontal Velocity
Doppler Components
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28 February 2005 15HSWT#29, Florence
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28 February 2005 16HSWT#29, Florence
Huygens Eastward DriftDuring Descent
DWEDISR
Difference
Integrate wind velocityto obtain:
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28 February 2005 17HSWT#29, Florence
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28 February 2005 18HSWT#29, Florence
DWE: Preliminary Results• Zonal winds above boundary layer are
PROGRADE
• Low-velocity layer between 60-80 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)
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28 February 2005 19HSWT#29, Florence
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28 February 2005 20HSWT#29, Florence
Wind Shear and Stability
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28 February 2005 21HSWT#29, Florence
Richardson Number
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28 February 2005 22HSWT#29, Florence
Thermal Gradients