Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsa21a..09j&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SA21A-09
Physics
2439 Ionospheric Irregularities, 2455 Particle Precipitation, 2471 Plasma Waves And Instabilities, 2483 Wave/Particle Interactions, 2704 Auroral Phenomena (2407)
Scientific paper
Thin layers of enhanced luminosity are commonly observed during auroral displays. The enhanced luminosity occurs at altitudes where thin, dense, heavy ion layers are often observed 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 full-particle electrostatic simulations of the nonlinear development of the instability. We also investigate the role of ion-neutral and electron-neutral collisions on the instability. The dense, heavy ion layer increases the growth rate of the instability and heats ambient electrons into a suprathermal tail that could produce enhanced emissions.
Johnson Jay Robert
Okuda Haruyuki
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