Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm32b..10n&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM32B-10
Physics
2407 Auroral Ionosphere (2704), 2411 Electric Fields (2712), 2451 Particle Acceleration, 7815 Electrostatic Structures, 7843 Numerical Simulation Studies
Scientific paper
Recent FAST satellite observation [Ergun et al., PRL, 87, 045003 (2001)] provide detailed measurements of a strong localized parallel electric field in the downward-current region of the auroral ionosphere. The results of new 1-D Vlasov simulations show that a strong electrostatic double layer, possessing a DC electric field with a spatial structure that is in good agreement with the FAST observations, develops from a weak density depression in a current-carrying plasma. The double layer produces a beam of accelerated electrons that interact with background electron on the high-altitude side resulting in a near-continuous series of electron holes via the electron two-stream instability. The electric-field signature of these holes is also in agreement with the FAST observations, including a characteristic gap between the location of DC field and the hole turbulence. Stages in the formation and eventual disruption of the double layer will be illustrated using phase-space and field diagnostics. Research supported by grants from NSF and NASA.
Ergun Robert E.
Goldman Martin V.
Newman D. L.
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