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Texture of the Solar-Wind Plasma

Texture of the Solar-Wind Plasma. Turbulence is confined to flux tubes. Median diameter is ~5x10 5 km. Plasma in each flux tube differs. Field-line wandering is confined to inside a flux tube. Flux tubes move independently in the macroscale flow of the solar wind.

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Texture of the Solar-Wind Plasma

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  1. Texture of the Solar-Wind Plasma Turbulence is confined to flux tubes. Median diameter is ~5x105 km. Plasma in each flux tube differs. Field-line wandering is confined to inside a flux tube. Flux tubes move independently in the macroscale flow of the solar wind. If created by the granules, this patternhas survived intact for ~100 hoursin the presence of MHD turbulence. The turbulence is inside!

  2. Bruno et al. Picture of Flux Tubes and the Parker Spiral

  3. Discontinuities in the Solar Wind

  4. Magnetic-Field Hodogram

  5. Time-Averaging: Turbulence Versus the Flux Tubes

  6. Tracing these Flux Tubes back to the Surface of a Rotating Sun The flux-tube sizes correspond to solar granules.

  7. Cellular Solar Wind • Field direction differs from cell to cell • (panel 1) • Cells move independently • (panel 2) • Plasma properties differ from cell to cell • (panels 3 + 4) • Electron heat flux differs cell to cell • (not shown) • No plasma mixing across cell walls: Cell walls are boundaries to the turbulence. …. Turbulence-in-a-Box ….

  8. The Flux Tubes Move Independent of Each Other in the Solar-Wind Flow Where there are jumps in the field direction, there are jumps in the flow velocity. The different flux tubes are moving at different speeds.

  9. Discontinuities Drastically Affect the Turbulence Analysis Discontinuity-free intervals yield different answers!

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