Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsa13b0289j&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SA13B-0289
Physics
2407 Auroral Ionosphere (2704), 2439 Ionospheric Irregularities, 2451 Particle Acceleration, 2471 Plasma Waves And Instabilities (2772), 2483 Wave/Particle Interactions (7867)
Scientific paper
Nearly half of the time, natural auroral displays exhibit thin, bright layers known as "enhanced aurora."There is a substantial body of evidence that connects these displays with thin, dense, heavy ion layers in the E-region. Based on the spectral characteristics of the enhanced layers, it is believed that the enhanced emissions result when wave-particle interactions heat ambient electrons to energies at or above the 17 eV ionization energy of N2. We investigate instabilities that occur in dense, heavy ion layers in the presence of strong cross-field currents that accompany electron precipitation. We examine global eigenvalue solutions of the instability including ionospheric collisions and kinetic effects which both play a role in localizing the instability to the thin heavy ion layer. In the nonlinear stage, the instability can heat ambient electrons into a suprathermal tail which we examine using a full-particle electrostatic simulations. Such electrons could produce the enhanced emissions observed in the aurora.
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