Accelerated Electrons in the Polar Cap Boundary

Details Accelerated Electrons in the Polar Cap Boundary Accelerated Electrons in the Polar Cap Boundary

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm51a0783c&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM51A-0783

Physics

2704 Auroral Phenomena (2407), 2708 Current Systems (2409), 2764 Plasma Sheet

Scientific paper

Observations from the FAST spacecraft in the Polar Cap boundary near midnight reveal a region of highly structured, strongly field-aligned and often counterstreaming electrons with downgoing fluxes sometimes in excess of 100 ergs cm-2 s-1. These distributions are coincident with observations of irregular oscillations in electric and magnetic field time series consistent with Alfven waves. In this presentation we examine, via simulations, the ability of the observed Alfven wave fields to account for electron distributions observed in this region from FAST. Comparison of simulation results with observations show remarkable qualitative agreement in both the time variation of observed and simulated field structures and electron pitch angle and energy distributions. This result verifies that this region is electrodynamically distinct from the traditional inverted-V auroral oval and is powered by impulsive wave Poynting flux rather than large-scale current systems.

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