Thin Current Sheets and Plasma Bubbles

Details Thin Current Sheets and Plasma Bubbles Thin Current Sheets and Plasma Bubbles

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm23b0415s&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM23B-0415

Physics

2723 Magnetic Reconnection (7526, 7835), 2744 Magnetotail, 2760 Plasma Convection (2463)

Scientific paper

The concept of plasma bubbles, that is underpopulated flux tubes, which may move toward the Earth much faster than the rest of the tail plasmas because of buoyancy effect, has been proposed by Pontius and Wolf [1990] to resolve the convection crisis problem and explain bursty transfer of magnetic flux and plasma in the tail. However, formation and properties of plasma bubbles remain insufficiently understood. The theory of forced magnetic reconnection combined with the stability analysis of the tail plasmas provides a model of the bubble origin as a result of the formation of a small plasmoid on the closed field lines in the magnetotail and its quick tailward retreat. It is shown that the flux tube that contained a plasmoid becomes a plasma bubble, with the plasmoid being replaced by a thin current sheet embedded within the original thicker sheet. Along the Sun-Earth direction this embedded current sheet is additionally sandwiched between two bifurcated current sheets. The new bubble formation theory is combined with the kinetic models of embedded and bifurcated current sheets. We report on the first results of such a combined kinetic theory of plasma bubbles and provide its detailed comparison with Geotail and Cluster observations.

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