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The Hall current system revealed as a statistical significant pattern during fast flows

Type
Journal article; Peer reviewed
Peer reviewed
Published version
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Date
2008-11-05
Author
Snekvik, Kristian
Nakamura, R.
Østgaard, Nikolai
Haaland, Stein
Retinò, A.
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Abstract
We have examined the dawn-dusk component of the magnetic field, BY , in the night side current sheet during fast flows in the neutral sheet. 237 h of Cluster data from the plasma sheet between 2 August 2002 and 2 October 2002 have been analysed. The spatial pattern of BY as a function of the distance from the centre of the current sheet has been estimated by using a Harris current sheet model. We have used the average slopes of these patterns to estimate earthward and tailward currents. For earthward fast flows there is a tailward current in the inner central plasma sheet and an earthward current in the outer central plasma sheet on average. For tailward fast flows the currents are oppositely directed. These observations are interpreted as signatures of Hall currents in the reconnection region or as field aligned currents which are connected with these currents. Although fast flows often are associated with a dawn-dusk current wedge, we believe that we have managed to filter out such currents from our statistical patterns.
URI
http://hdl.handle.net/1956/3585
Citation
Annales Geophysicae 26(11): 3429-3437
Publisher
European Geosciences Union
Subject
Magnetospheric physics
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  • Department of Physics and Technology 770
European Geosciences Union

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