Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm32b..03b&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM32B-03
Physics
2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2764 Plasma Sheet, 2778 Ring Current, 2788 Storms And Substorms
Scientific paper
HENA has observed ENA emissions from the ring current (L<6) and out to L=13 for periods of of southward IMF when the geomagnetic field is stretched. During dipolarization the ENA flux from the L<8 region decreases rapidly. In this presentation we discuss what physical mechanism may lie behind the observed dynamics in the light of in-situ observations. It is believed that the flux decrease during dipolarization is caused by the dipolarization induced E-field, which brings ions to lower L-shells faster than they can be replinished by the overall convection, creating a void of particles in the plasma sheet. This scenario implies that the acceleration region must be localized to, from L=8 out to, at least L=13. We also discuss what can be said about transport during the dipolarization. Is it Earthward? Can we see where the dipolarization starts? We show a few examples of weak and still uncertain signatures of both Earthward and anti earthward propagation. We present different scenarios of how these signatures can be explained.
C:son Brandt Pontus
DeMajistre Robert
Mitchell Donald G.
Ohtani Shin
Roelof Edmond C.
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