Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm22a..07l&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM22A-07
Physics
7815 Electrostatic Structures, 7835 Magnetic Reconnection (2723, 7526), 7839 Nonlinear Phenomena (4400, 6944), 7851 Shock Waves (4455), 7852 Solitons And Solitary Waves (4455)
Scientific paper
ESWs are usually observed in the plasma sheet boundary layer in the magnetotail, and in the vicinity of the magnetic reconnection diffusion region. Here we report the observation of ESWs in the vicinity of the core region of a magnetic reconnection X-null in the near-earth tail. The intricate X-null structure includes the twisted magnetic field Bz on the earthward-side in the X-Y plane and a slow-shock on the tailward side. From the WaveForm Capture (WFC) measurement, wave turbulence has been analyzed in the close vicinity of X- null region. Results confirm ESWs exist in the region very close to the core of the X-null, which is suggested to be a generation source of such kind of solitary structure. The ESWs are observed both in the upstream and downstream of the slow-shock in the core of X-null region, and are also observed in the +Y and -Y side of the twisted null structure. The opposite polarization of the ESW in the upstream and downstream of the slow-shock around the X-null can be used as a tracer to derive the source region of the ESWs associated with tail reconnection. The ESWs' spatial structure is re-constructed by assuming the perfect synchronous bi- polar waveform in the direction parallel to the ambient field. The ESW can propagate along (parallel to or anti-parallel to) the ambient magnetic field after its generation. The amplitude of ESWs weakens as the distance from the X-null region increases and thus the electron hole is suggested to die out. The spatial structure of ESWs around the vicinity of the X-null can bring a new light to the ESWs' evolution and even to the energy release process during reconnection.
Deng Xinghua
Kojima Hedeyasu
Lembege Bertand
Li Shiheng
Nagai Takaya
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