HR: 0800h
AN: SM51A-0337    [Abstracts]
TI: Multi-Instrument Mapping of the Small-Scale Flow Dynamics Related to a Cusp Auroral Transient
AU: * Oksavik, K
EM: kjellmar.oksavik@fys.uio.no
AF: University of Oslo, Department of Physics, PB 1048 - Blindern, Oslo, N-0316 Norway
AU: * Oksavik, K
EM: kjellmar.oksavik@fys.uio.no
AF: JHU/APL, 11100 Johns Hopkins Road, Laurel, MD 20723 United States
AU: Moen, J
EM: j.i.moen@fys.uio.no
AF: University of Oslo, Department of Physics, PB 1048 - Blindern, Oslo, N-0316 Norway
AU: Moen, J
EM: j.i.moen@fys.uio.no
AF: University Centre on Svalbard, Arctic Geophysics, PB 156, Longyearbyen, N-9171 Norway
AU: Carlson, H C
EM: herb.carlson@afosr.af.mil
AF: AFRL/AFOSR/CA, 4015 Wilson Blvd, Rm 713, Arlington, VA 22203 United States
AU: Greenwald, R A
EM: Ray.Greenwald@jhuapl.edu
AF: JHU/APL, 11100 Johns Hopkins Road, Laurel, MD 20723 United States
AU: Milan, S E
EM: ets@ion.le.ac.uk
AF: University of Leicester, Department of Physics and Astronomy, Leicester, LE1 7RH United Kingdom
AU: Lester, M
EM: mle@ion.le.ac.uk
AF: University of Leicester, Department of Physics and Astronomy, Leicester, LE1 7RH United Kingdom
AU: Denig, W F
EM: William.Denig@hanscom.af.mil
AF: AFRL/VSBXP, 29 Randolph Rd, Hanscom Afb, MA 01731 United States
AU: Barnes, R J
EM: robin.barnes@jhuapl.edu
AF: JHU/APL, 11100 Johns Hopkins Road, Laurel, MD 20723 United States
AB: In this paper we focus on flux transfer events (FTEs) and poleward moving auroral forms (PMAFs) in the cusp region, combining data from the EISCAT Svalbard radar, SuperDARN HF radars, ground-based optics, and three low-altitude polar-orbiting spacecraft. During an interval of southward interplanetary magnetic field the EISCAT Svalbard radar tracked a train of narrow flow channels drifting into the polar cap. One 30-60 km wide flow channel surrounded by flow running in the opposite direction is studied in great detail from when it formed equatorward of the cusp aurora near magnetic noon until it left the field-of-view and disappeared into the polar cap. Satellite data shows that the flow channel was on open field lines. The flow pattern is consistent with field-aligned currents on the sides of the flow channel; with a downward current on the equatorward side, and an upward current on the poleward side. The poleward edge of the flow channel was coincident with a PMAF that separated from the background cusp aurora and drifted into the polar cap. A passage of the DMSP F13 spacecraft confirms that the FTE flow channel was still discernable over 15 minutes after it formed, as the spacecraft revealed a 30-40 km wide region of sunward flow within the anti-sunward background convection. From the dimensions of the flow channel we estimate that the magnetic flux contained in the event was at least 1 MWb. Furthermore, we suggest that the Birkeland current filaments often seen by low-altitude spacecraft in the cusp/mantle are really associated with FTEs in progress, and consequently we suggest that a more precise name for the region 0 or cusp/mantle current would be the FTE current system, as it is rather attributed to a flux tube on the move than a fixed region in space.
DE: 2475 Polar cap ionosphere
DE: 2704 Auroral phenomena (2407)
DE: 2708 Current systems (2409)
DE: 2724 Magnetopause, cusp, and boundary layers
DE: 2736 Magnetosphere/ionosphere interactions
SC: SPA-Magnetospheric Physics [SM]
MN: 2004 AGU Fall Meeting