A Study of the Orientation, Propagation Speeds, and Thicknesses of Electric Field and Density Structures Observed by Cluster~II in the High-Altitude Auroral Region

Details A Study of the Orientation, Propagation Speeds, and Thicknesses of Electric Field and Density Structures Observed by Cluster~II in the High-Altitude Auroral Region A Study of the Orientation, Propagation Speeds, and Thicknesses of Electric Field and Density Structures Observed by Cluster~II in the High-Altitude Auroral Region

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm32a0800h&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM32A-0800

Physics

2704 Auroral Phenomena (2407), 2712 Electric Fields (2411)

Scientific paper

The high-altitude auroral region constitues an integral part of the auroral zone electrodynamic system. The high-altitude perpendicular flows and the electric fields associated with those flows are the drivers for the low-altitude flows and mid-altitude acceleration processes that occur in the auroral zone. An interesting open question that the Cluster~II mission is ideally suited to answer is what properties of the generator region and the flows and density structures observed therin are related to the proper motion of the auroral acceleration region and auroral arcs. We will present the results of a study of more than twenty crossings of the high-altitude auroral zone by the Cluster~II spacecraft. The multi-point electric field and density measurements from the Cluster~II constellation will be used to estimate the direction and speed of propagation of structures in the electric fields and plasma density (as inferred from spacecraft floating potential measurements), as well as quantify the thicknesses of those structures. The implications of our observational results on the proper motion of arc systems in the ionosphere will be discussed.

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