Enhanced Aurora and Instabilities in Thin Ionization Layers

Details Enhanced Aurora and Instabilities in Thin Ionization Layers Enhanced Aurora and Instabilities in Thin Ionization Layers

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa21c0375o&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA21C-0375

Physics

2407 Auroral Ionosphere (2704), 2439 Ionospheric Irregularities, 2455 Particle Precipitation, 2471 Plasma Waves And Instabilities, 2483 Wave/Particle Interactions

Scientific paper

Thin layers of enhanced luminosity are commonly observed in auroral displays. 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 could occur in dense, heavy ion layers in the presence of strong cross-field currents that accompany electron precipitation. We present analytical full-wave solutions and electrostatic particle simulations of the nonlinear development of the instability. The heavy ion layer increases the growth rate of the instability and heats ambient electrons into a suprathermal tail that could produce the enhanced emissions.

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