Observations of ion acoustic fluctuations in the auroral topside ionosphere by the FREJA S/C

Autor:	S. Chesney, B. Cabrit, Thomas Chust, John W. Bonnell, Alain Roux, Paul M. Kintner, B. Holback, H. de Feraudy, Anders Eriksson, Michael C. Kelley, Jan-Erik Wahlund, Philippe Louarn
Rok vydání:	1994
Předmět:	Physics Plasma Geophysics Ion acoustic wave Computational physics Ion Alfvén wave Amplitude Physics::Plasma Physics Electric field Excited state Physics::Space Physics General Earth and Planetary Sciences Ionosphere
Zdroj:	Geophysical Research Letters. 21:1835-1838
ISSN:	0094-8276
DOI:	10.1029/94gl01290
Popis:	The widespread existence of naturally excited broadband electrostatic wave activity up to 15 kHz, with predominantly parallel polarization, have been detected in the topside auroral ionosphere by the wave experiment onboard the Freja S/C. Amplitudes of a few mV/m electric field fluctuations and a few % density fluctuations are typically observed, but stronger cases are quite common. These emissions are most often observed within the auroral energization region according to the plasma instrument data, and coincide frequently with Alfven wave activity from a few Hz to tens of Hz. This suggests that the electrostatic emission is linked to the nonlinear evolution of kinetic Alfven waves.
Databáze:	OpenAIRE
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