Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm11c1173s&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM11C-1173
Physics
2431 Ionosphere/Magnetosphere Interactions (2736), 2704 Auroral Phenomena (2407), 2736 Magnetosphere/Ionosphere Interactions
Scientific paper
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.
Balogh André
Fazakerley Andrew N.
Fontaine Dominique
Paschmann Goetz
Reme Henri
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