HR: 0830h
AN: SM11C-1173    [PDF]
TI: A muti-instrument study of polar cap outflowing plasma
AU: * Sauvaud, J
EM: sauvaud@cesr.fr
AF: CESR, 9, ave du colonel Roche, Toulouse, 31028 France
AU: Fontaine, D
EM: dominique.fontaine@cetp.ipsl.fr
AF: CETP, 10 ave de l'Europe, Velizy, 78140 France
AU: Paschmann, G
EM: goetz.paschmann@issi.unibe.ch
AF: MPE, Giessenbachstrasse, Garching, D 85740 Germany
AU: Balogh, A
EM: a.balogh@ic.ac.uk
AF: Imperail College, Prince Consort Rd., London, SW7 2BW United Kingdom
AU: Fazakerley, A N
EM: anf@mssl.ucl.ac.uk
AF: MSSL, Holmbury St Mary, Dorking, RH5 6NT United Kingdom
AU: Reme, H
EM: reme@cesr.fr
AF: CESR, 9, ave du colonel Roche, Toulouse, 31028 France
AB: We present a Cluster multi-experiment study of outflowing ion beams inside the auroral zone and inside the polar cap. Data are taken at altitudes of the order of 4 RE. At such high altitudes, discrete auroral events of ion outflows can still show the typical particle and field structures reported at lower altitudes; field aligned upgoing ion beams, downgoing electrons, and a converging electric field structure. Inside the polar cap,the same kind of events are also seen. However, many cases of low energy outflowing ion beams display a quite different particle and field topology indicating that the paralell electric field is not strong enough to cause the loss of the precipitating electrons. Both donwngoing and upgoing electrons display a peaked spectra at the same energy, in the 100 eV range. These observations tend to show that the paralell electric field is here weak and widely distributed in altitude. We discuss these events in terms of magnetosphere-ionosphere coupling.
DE: 2431 Ionosphere/magnetosphere interactions (2736)
DE: 2704 Auroral phenomena (2407)
DE: 2736 Magnetosphere/ionosphere interactions
SC: SPA - Magnetospheric Physics [SM]
MN: 2003 Fall Meeting