Physics
Scientific paper
Nov 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003georl..30ussc6s&link_type=abstract
Geophysical Research Letters, Volume 30, Issue 21, pp. SSC 6-1, CiteID 2106, DOI 10.1029/2003GL018292
Physics
4
Electromagnetics: Plasmas, Magnetospheric Physics: Auroral Phenomena (2407), Magnetospheric Physics: Mhd Waves And Instabilities, Magnetospheric Physics: Numerical Modeling
Scientific paper
Current sheets having a transverse scale near the electron inertial length c/ωp have been shown to be unstable using a reduced MHD description with electron inertia [Seyler and Wu, 2001]. This robust instability arises from the advection of the parallel current which lowers the magnetic energy resulting in vortex formation. The instability is localized where the parallel current shear and B⊥ are near a maximum. Observations from Freja, FAST, and CLUSTER show fluctuation enhancement in regions where current shear maximizes. The simulation spectral ratios δE/δB and δE/δn are found to be consistent with satellite data. The agreement between observations and simulations support the simulation results as the generation mechanism of BBELF (broad-band extremely low-frequency) fluctuations.
Seyler Charles E.
Xu Taiyi
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