1 Depth of a Strong Jovian Jet From a Planetary-Scale Disturbance Sanchez-Lavega (Universidad del Pais Vasco, Spain), G.S. Orton (JPL), et al. 24 Jan.

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Presentation transcript:

1 Depth of a Strong Jovian Jet From a Planetary-Scale Disturbance Sanchez-Lavega (Universidad del Pais Vasco, Spain), G.S. Orton (JPL), et al. 24 Jan issue, vol. 451

2 HST images on 25 Mar 2007 fortuitously captured the onset of an uncommon planetary-scale disturbance in the peak of the highest speed Jovian jet at 23.5 deg N latitude. In the peak of the jet, a small, round bright cloud with a size of 500 km (plume B) grew rapidly. The second plume, plume A, emerged less than 9.3 hours later at a distance of 63,000 km (55 deg longitude) to the east of plume B. Both plumes grew to a size of 2000 km in 1.3 days. If Plume B triggered Plume A then the propagation velocity of the triggering process would have to travel at 1.5 times the sound speed.

3 Plumes and their tails retrieved at high altitude (NASA-IRTF, 2.3 micron methane filter).

4 Multi-wavelength imaging of the NTB Disturbance 5 April 2007 Two high plumes Trailing “wake” from each is dark, bright at 5 μm Remove upper-level clouds Longitude°W (System III) Centric Latitude °N RGB, Zac Pujic NASA IRTF 1.58 μm 2.17 μm 4.78 μm

5 Near-Infrared Survey of NTBs Outbreak Plumes- Full data set ←missing! NH 3 ice?

6 Convective cell modeling is able to fit the observed cloud tops of the plumes. The new observations are consistent with a wind extending deep into the atmosphere, about 100 km below the level reached by solar radiation. Corresponds to 5-7 bars pressure and at the base of the presumed water cloud. Thus the energy source of the disturbance must arise from an internal heat source.

7 HST press release