Other
Scientific paper
May 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsm32a..04h&link_type=abstract
American Geophysical Union, Spring Meeting 2002, abstract #SM32A-04
Other
2704 Auroral Phenomena (2407), 2712 Electric Fields (2411)
Scientific paper
Electric fields parallel to the magnetic field vector play a major role in the transport of mass, momentum, and energy in the auroral zone. In this paper, we present direct observations of large amplitude, macroscopic parallel electric fields ( ~ 25 mV/m to 300 mV/m) measured by the electric field instrument on Polar in the upward current part of the auroral acceleration region. We will discuss the properties of the parallel electric fields and their relation to other parameters that characterize the auroral region. We provide evidence that suggests these large amplitude, macroscopic parallel electric fields are the result of an ambipolar response of the plasma to sharp density gradients at the interface separating the cold, dense ionospheric plasma from the hot, tenuous magnetospheric plasma.
Bonnell J. W.
Hull Arthur J.
Mozer Forrest S.
Scudder Jack D.
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