Cluster observations of an auroral potential and associated field-aligned current reconfiguration during thinning of the plasma sheet boundary layer
2007 (English)In: Journal of Geophysical Research, ISSN 0148-0227, Vol. 112, no 1, 10.1029/2006JA011804- p.Article in journal (Refereed) Published
Cluster observations are used to illustrate the reconfiguration of an auroral potential structure encountered at the poleward boundary of the central plasma sheet within the Southern Hemisphere premidnight auroral oval. The reconfiguration from a symmetric U shape to an asymmetric S shape takes place between two consecutive crossings by Cluster spacecraft 1 and 2, moving along roughly the same orbits and separated in time by 16 min. During this time the plasma conditions poleward of the boundary changed dramatically. The fluxes of energetic electrons decreased, as did the intensities of the associated small-scale field-aligned currents (FACs) and the ambient plasma density. These changes were particularly pronounced in a narrow region adjacent to the boundary. The reconfiguration of the potential structure, and of the associated FAC system consistent with this, are consistent with the predictions by Marklund et al. (2004).
Place, publisher, year, edition, pages
2007. Vol. 112, no 1, 10.1029/2006JA011804- p.
PARALLEL ELECTRIC-FIELDS; RETURN CURRENT REGION; PARTICLE-ACCELERATION; BLACK AURORA; MAGNETOSPHERE; EVOLUTION; ARCS
Fusion, Plasma and Space Physics
IdentifiersURN: urn:nbn:se:kth:diva-7559DOI: 10.1029/2006JA011804ISI: 000243532100001ScopusID: 2-s2.0-34547935961OAI: oai:DiVA.org:kth-7559DiVA: diva2:12622
QC 201007302007-10-222007-10-222010-07-30Bibliographically approved