Physics
Scientific paper
May 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sm62a09c&link_type=abstract
American Geophysical Union, Spring Meeting 2001, abstract #SM62A-09
Physics
2730 Magnetosphere--Inner, 2740 Magnetospheric Configuration And Dynamics, 2760 Plasma Convection, 2778 Ring Current, 2784 Solar Wind/Magnetosphere Interactions
Scientific paper
Energetic neutral atom (ENA) images from the ENA imager on board the Swedish microsatellite Astrid-1 are presented. The images are taken from below the ring current at 0200 magnetic local time (MLT) around the equator at 1000 km altitude and show a narrow flux tube post midnight. Using a model of the equatorial ion distribution, we extract an ion distribution 25° wide in longitude centered around 0230 MLT on approximately L=4-6. The magnetosphere had been quiet for the past five days with Dst not less than -50 nT. The IMF Bz was +2 and -3 nT at the times of observation. When the interplanetary magnetic field (IMF) Bz=-3 nT the ENA flux from the flux tube was brighter and the MLT location was displaced more westward than for the case with Bz=+2 nT. Tracing of the drift trajectories in a Volland-Stern electric field implies that the observed ``flux tube'' is due to a narrow flow channel from a source location in the plasmasheet.
Barabash Stas
C:son Brandt Pontus
Ebihara Yasuhiro
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