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Enhanced Ion Acoustic Lines Due to Strong Ion Cyclotron Wave Fields : Volume 26, Issue 8 (31/07/2008)

By Bahcivan, H.

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Book Id: WPLBN0004001805
Format Type: PDF Article :
File Size: Pages 15
Reproduction Date: 2015

Title: Enhanced Ion Acoustic Lines Due to Strong Ion Cyclotron Wave Fields : Volume 26, Issue 8 (31/07/2008)  
Author: Bahcivan, H.
Volume: Vol. 26, Issue 8
Language: English
Subject: Science, Annales, Geophysicae
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Cosgrove, R., & Bahcivan, H. (2008). Enhanced Ion Acoustic Lines Due to Strong Ion Cyclotron Wave Fields : Volume 26, Issue 8 (31/07/2008). Retrieved from

Description: Center for Geospace Studies, SRI International, Menlo Park, CA, USA. The Fast Auroral Snapshot Explorer (FAST) satellite detected intense and coherent 5–20 m electric field structures in the high-latitude topside auroral ionosphere between the altitudes of 350 km and 650 km. These electric fields appear to belong to electrostatic ion cyclotron (EIC) waves in terms of their frequency and wavelengths. Numerical simulations of the response of an electron plasma to the parallel components of these fields show that the waves are likely to excite a wave-driven parallel ion acoustic (IA) instability, through the creation of a highly non-Maxwellian electron distribution function, which when combined with the (assumed) Maxwellian ion distribution function provides inverse Landau damping. Because the counter-streaming threshold for excitation of EIC waves is well below that for excitation of IA waves (assuming Maxwellian statistics) our results suggest a possible two step mechanism for destabilization of IA waves. Combining this simulation result with the observational fact that these EIC waves share a common phenomenology with the naturally enhanced IA lines (NEIALS) observed by incoherent scatter radars, especially that they both occur near field-aligned currents, leads to the proposition that this two-step mechanism is an alternative path to NEIALS.

Enhanced ion acoustic lines due to strong ion cyclotron wave fields

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