THEMIS Observations of Double Layers in Plasma Sheet

Details THEMIS Observations of Double Layers in Plasma Sheet THEMIS Observations of Double Layers in Plasma Sheet

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm52a..01e&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM52A-01

Physics

[2744] Magnetospheric Physics / Magnetotail

Scientific paper

The THEMIS satellites have made direct observations of parallel electric fields carried by double layers in the central plasma sheet of the Earth’s magnetosphere. The double layers have a parallel electric field signal that is analogous to that reported by the FAST satellite in the downward current region of the aurora. Double layers are observed during bursty bulk flow events, in the current sheet, and plasma sheet boundary layer, all during periods of strong magnetic fluctuations. The double layers have amplitudes as high as 100s of mV/m and carry potentials on the order of 100 V to ~3000V. The occurrence of double layers is such that a significant fraction (1% or more) of the magnetic field lines are undergoing non-ideal behavior. These observations imply that strongly nonlinear and kinetic behavior is intrinsic to the Earth’s plasma sheet and perhaps, to many space and astrophysical plasmas.

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