Physics
Scientific paper
Jul 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3213107v&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 13, CiteID L13107
Physics
8
Magnetospheric Physics: Mhd Waves And Instabilities (2149, 6050, 7836), Magnetospheric Physics: Numerical Modeling, Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Substorms
Scientific paper
Computer modeling is performed in order to explore a hypothesis stating that the near-Earth breakup can be triggered by a pulse of convection traveling earthward from the more distant magnetotail. The following possible scenario for the interaction of the burst with the near-Earth edge of the plasma sheet (PS) is revealed. The near-dipolar magnetic field topology of the inner PS leads to the flow breaking which in turn launches a wide spectrum of dispersive compressional waves propagating further Earthward. Strong topological variations of the magnetic field at the inner edge of the PS, required by the equilibrium conditions, play a role of the resonant cavity for selected compressional modes. Growing resonance modes provide a ponderomotive force pumping up corresponding nonlinear ballooning eigenmodes. The latter extract energy stored in the inner PS and produce vortical structures expanding tailward.
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