Topological Features of a Compressible Plasma Vortex Sheet: 6 Cases
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The Voyager and Pioneer Spacecraft have detected large-scale quasi-periodic plasma fluctuations in the outer heliosphere beyond 20 AU. A plasma vortex sheet model can explain these fluctuations and the observed correlations between various physical variables. The large scale outer heliosphere is modeled by solving the 3-D compressible magnetohydrodynamic equations involving three interacting shear layers. Computations were done on a Cray computer at the NASA Center for Computational Sciences. Six cases are animated: Weak magnetic field and strong magnetic field, each at three values of tau, the vortex street characteristic time. Contours of density are shown as dark transparent 'tubes'. Critical points of the velocity field are represented by 'Glyphs'. Vortex cores are shown in orange and blue.
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An animation of a vortex street with a weak magnetic field and a tau of 20
Duration: 38.0 seconds
Available formats:
352x240 (29.97 fps)
MPEG-1
5 MB
160x80
PNG
21 KB
80x40
PNG
6 KB
320x238
JPEG
11 KB
How to play our movies
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An animation of a vortex street with a weak magnetic field and a tau of 40
Duration: 1.2 minutes
Available formats:
352x240 (29.97 fps)
MPEG-1
9 MB
320x238
JPEG
14 KB
How to play our movies
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An animation of a vortex street with a weak magnetic field and a tau of 60
Duration: 1.0 minutes
Available formats:
352x240 (29.97 fps)
MPEG-1
8 MB
320x238
JPEG
9 KB
How to play our movies
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An animation of a vortex street with a strong magnetic field and a tau of 20
Duration: 56.0 seconds
Available formats:
352x240 (29.97 fps)
MPEG-1
7 MB
320x238
JPEG
11 KB
How to play our movies
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An animation of a vortex street with a strong magnetic field and a tau of 80
Duration: 1.1 minutes
Available formats:
352x240 (29.97 fps)
MPEG-1
8 MB
320x238
JPEG
11 KB
How to play our movies
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An animation of a vortex street with a strong magnetic field and a tau of 80
Duration: 38.0 seconds
Available formats:
352x240 (29.97 fps)
MPEG-1
5 MB
320x238
JPEG
18 KB
How to play our movies
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| Animation Number: | 8 |
| Animators: | Cindy Starr (Lead) |
| | Pamela ONeil |
| Studio: | SVS |
| Completed: | 1993-12-17 |
| Scientists: | Edouard Siregar (NASA/GSFC) |
| | Sanjoy Ghosh (NASA/GSFC) |
| Series: | Vortex Street |
| Video: | SVS1993-0001 * |
Keywords:
SVS
>> Heliosphere
SVS
>> Instability
SVS
>> Plasma
DLESE
>> Space science
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| Science paper: | Siregar, E., D. A. Roberts, and M. L. Goldstein, Quasi-periodic transverse plasma flow associated with an evolving MHD vortex street in the outer heliosphere, J. Geophys. Res., 98, 13, 233, 1993. |
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Please give credit for this item to
NASA/Goddard Space Flight Center
Scientific Visualization Studio |
*Please note: the SVS does not fulfill requests for copies of the tapes in our library. On some of our animation pages, there is a direct link to a video distribution service from which tapes, handled by the Public Affairs Office (PAO)/Goddard TV, including some of our animations may be ordered. General information on this service can be found here. |
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