Bursty Bulk Flows in 3D MHD Simulations

Details Bursty Bulk Flows in 3D MHD Simulations Bursty Bulk Flows in 3D MHD Simulations

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm52a..07b&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SM52A-07

Physics

Plasma Physics

[2723] Magnetospheric Physics / Magnetic Reconnection, [2740] Magnetospheric Physics / Magnetospheric Configuration And Dynamics, [2752] Magnetospheric Physics / Mhd Waves And Instabilities, [7835] Space Plasma Physics / Magnetic Reconnection

Scientific paper

Using three-dimensional MHD simulations of near tail reconnection, we present spatial and temporal properties of bursty bulk flows. The dynamic evolution shows a strong interaction between magnetic reconnection and ballooning/interchange instability. Reconnection is an important factor in generating a loss of entropy from closed flux tubes and thereby destabilizing ballooning/interchange modes, consistent with MHD stability theory. This coincides closely with the onset of lobe reconnection. The onset of these modes then drives faster reconnection, provides cross-tail structure, and stimulates multiple flow bursts. A comparison with 2D simulations demonstrates the significance of this interaction particularly for the flows into the near tail closed field line region. The dynamics of the flow evolution involves vortices, bouncing, and pulsations, which are consistent with observations.

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