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Instability of short wavelength electrostatic electron-cyclotron modes in the presence of an ion density ripple in plasmas
Umeå University, Faculty of Science and Technology, Department of Physics. Institut für Theoretische Physik IV, Ruhr-Universität Bochum, D-44780 Bochum, Germany; Scottish Universities Physics Alliance (SUPA), Department of Physics, University of Strathclyde, Glasgow G4 0NG, UK; GoLP/Instituto de Plasmas Fusão Nuclear, Instituto Superior Técnico, Universidade Técnica de Lisboa, 1049-001 Lisboa, Portugal; School of Physics, University of KwaZulu-Natal, 4000 Durban, South Africa; Max-Planck Institut für extraterrestrische Physik, D-85740 Garching, Germany.
2009 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. 80, no 3, 038201Article in journal (Refereed) PublishedText
Abstract [en]

It is shown that short wavelength (in comparison with the ion thermal gyroradius), high-frequency (HF) electrostatic electron-cyclotron (EEC) modes can be excited by the pre-existing ion density ripple across the external magnetic field in a dusty magnetoplasma. For this purpose, we use the Boltzmann distributed ion density perturbation, together with the electron continuity and momentum equations, and derive the standard Mathieu equation. The latter admits unstable solutions, demonstrating that the short wavelength HF-EEC-like modes in dusty magnetoplasmas can be driven due to the free energy in the ion density ripple.

Place, publisher, year, edition, pages
Bristol: Institute of Physics (IOP), 2009. Vol. 80, no 3, 038201
Keyword [en]
intense bursts, harmonic waves, geotail
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:umu:diva-115979DOI: 10.1088/0031-8949/80/03/038201ISI: 000269554300019OAI: oai:DiVA.org:umu-115979DiVA: diva2:907153
Available from: 2016-02-26 Created: 2016-02-08 Last updated: 2016-02-26Bibliographically approved

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Shukla, Padma Kant
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