Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm43a1706s&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM43A-1706
Physics
2721 Field-Aligned Currents And Current Systems (2409), 2744 Magnetotail
Scientific paper
In this poster we present Cluster observations of two kinds of field aligned currents in the magnetotail. The first kind is the localized current wedge produced by the shear in the flow and the magnetic field at the boundary of a BBF. Cluster enter the flow from the side in the outer central plasma sheet and detect negative excursion in BZ and BY at the flank of the BBF which produce a field aligned current. Inside the flow BZ and EY increase. That does also the temperature, while the density decreases. Thus the BBF has the properties of a depleted flux tube. The second kind is the field aligned currents produced by the divergence of the Hall currents in the ion diffusion region. This result is from a statistical survey of Cluster magnetic field measurements during fast flows. By fitting the magnetic field to a Harris current sheet, a derivative of BY with respect to the Z axis has been used to estimate the X-component of the current density (jX). The analysis reveals the quadrupolar pattern of BY and the corresponding loop-like pattern of jX.
Haaland Skjalg
Nakamura Riou
Snekvik K.
Østgaard Nikolai
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