Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm33b0370z&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM33B-0370
Other
2744 Magnetotail, 2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2753 Numerical Modeling, 2764 Plasma Sheet, 2790 Substorms
Scientific paper
Traditionally bursty bulky flows (BBFs) are often interpreted as a signature of the middle magnetotail reconnection, or as the propagation of "bubbles" (flux tubes that have lower values of pV^{5/3} than their neighbors, where p is the thermal pressure of the particles and V is the volume of a tube containing one unit of magnetic flux) in the near-Earth's plasma sheet. Recent MHD simulations of nonlinear ballooning instability in near-Earth magnetotail indicate the generation of bulk flows, with the peak speeds that are sub-Alfvenic, as a generic feature of the intermediate nonlinear development of the ballooning instability. These nonlinear ballooning instability induced flows are mostly dominated by its x- component, which align along the unstable flux tubes and maximize at the equatorial plane. Within the meridian plane, the flow component contour demonstrates intermittent pattern among flux tubes. In the dawn-dusk direction and near the equatorial plane, the generated flow alternates between Earth-ward and tail-ward direction -- a signature of ballooning-interchange instability related to the finger pattern formation in pressure contour. Current sheet thinning and compression reduction due to lower adiabatic index are found to be two effective mechanisms of enhancing the flow growth and the localization of the flow distribution to the equatorial plane. We propose the nonlinear ballooning instability as another possible origin of the BBFs in the near-Earth plasma sheet.
Bhattacharjee Anirban
Hegna C. C.
Sovinec Carl
Zhu Peicheng
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