Physics
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm21b..09d&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM21B-09
Physics
2704 Auroral Phenomena (2407), 2712 Electric Fields (2411)
Scientific paper
Over the past decade electron-holes have been seen in space plasmas by NASA satellites from Polar to GEOTAIL, but most frequently in the downward current region by FAST. Electron-holes are a common occurrence and their structure is fairly well understood. However, it remains unclear whether they are merely an interesting plasma phenomena indicative of a turbulent environment or they play a critical role in the flow of energy and momentum in the magnetosphere-ionosphere system. We analyze the possibility that the generation of electron holes in the downward (or return) current region of the auroral ionosphere induces a parallel resistivity which, in turn, supports substantial field aligned potential drops. New results from FAST suggest that e-holes, parallel potential drops and VLF saucers are generated within a short (< 10 km) region along a downward current flux tube. Using this constraint we present an analysis showing that e-hole resistivity could support parallel electric fields of the order of 1 mV/m. As part of this analysis we use plasma simulations of e-hole formation under a various conditions.
Dyrud Lars P.
Oppenheim Meers M.
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