The current-voltage relationship, cold electrons and waves in multiple auroral arcs

Details The current-voltage relationship, cold electrons and waves in multiple auroral arcs The current-voltage relationship, cold electrons and waves in multiple auroral arcs

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm12a0491p&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM12A-0491

Physics

2409 Current Systems (2708), 2451 Particle Acceleration, 2455 Particle Precipitation, 2467 Plasma Temperature And Density, 2483 Wave/Particle Interactions

Scientific paper

Discrete auroral arcs are the result of accelerated electrons colliding with the upper atmosphere. The acceleration of these auroral electrons is often due to quasi-static electric fields which are part of a field-aligned current system. Data from six magnetic conjunctions between the FAST satellite and all-sky image data of multiple arcs are analyzed to examine the current-voltage relationship in mesoscale multiple arcs. FAST electron data are fit with accelerated Maxwellian distributions to obtain field-aligned source temperatures, densities and electrostatic potential drops. These values are then used to calculate a field-aligned conductance using the Lyons-Evans-Lundin (LEL) formulation. When compared with the calculated parallel current (conductance multiplied by the potential energy drop), the measured parallel current shows good agreement across most multiple arc systems except in regions with the largest precipitating energy fluxes. In these regions a significant cold electron population is present at energies above the potential drop energy and the measured currents are larger than the calculated LEL currents. These regions are 100 percent correlated with two narrow-band ELF waves: one band at the oxygen gyrofrequency and one at a fraction of the proton frequency. The properties of these waves and their relationship to observed cold electron distributions will be explored in order to understand the role of the waves in the electrodynamics of the upward current region of multiple arc regions.

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