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Formation of lower-hybrid solitary structures by modulational interaction between lower-hybrid and dispersive Alfven waves
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.
2009 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 27, no 3, 1027-1033 p.Article in journal (Refereed) Published
Abstract [en]

We investigate the possibility that lower-hybrid solitary structures (LHSS), which are frequently observed in the Earth's ionosphere and magnetosphere, are formed as a result of a modulational interaction between lower-hybrid and dispersive Alfven waves of initially small amplitude. A large amplitude lower-hybrid pump wave can excite density structures with length scales transverse to the geomagnetic field of the order of the ion gyroradius via a modulational instability. The structure formation in the nonlinear stage of the instability is investigated by numerical solutions of the governing equations, using plasma parameters relevant for LHSS observations in the upper ionosphere and in the magnetosphere. The numerical solutions reveal that the lower-hybrid waves become self-localized inside cylindrically symmetric (with respect to the ambient magnetic field) density cavities, in qualitative agreement with observations. Our model includes thermal electron effects but shows no stabilization at the ion sound gyroradius, suggesting that any preference of observed LHSS for that perpendicular scale likely is due to processes arresting the cavity collapse.

Place, publisher, year, edition, pages
2009. Vol. 27, no 3, 1027-1033 p.
Keyword [en]
Space plasma physics, Nonlinear phenomena, Numerical simulation studies, Wave-wave interactions
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-148706DOI: 10.5194/angeo-27-1027-2009ISI: 000264676500012OAI: oai:DiVA.org:uu-148706DiVA: diva2:402843
Available from: 2011-03-10 Created: 2011-03-09 Last updated: 2017-12-11Bibliographically approved

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