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Constraints on the Formation and Structure of Langmuir Eigenmodes in the Solar Wind
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division.ORCID iD: 0000-0002-1046-746X
2013 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 111, no 12, 121101- p.Article in journal (Refereed) Published
Abstract [en]

Localized Langmuir waves are commonly observed in space plasmas and are a potential source of radio waves. Using electric field data from STEREO, it is shown that these localized Langmuir waves are eigenmodes of density wells estimated independently. An analytic model is developed for the eigenmode frequencies. The inferred depths and widths of the density wells typically only allow the zeroth-order Langmuir eigenmode to form, explaining the preponderance of single-peaked waveforms. More complicated waveforms are shown to be consistent with single eigenmode solutions of more complicated density profiles. The inferred depth of the density well increases with Langmuir wave intensity, consistent with the ponderomotive force but not wave packet collapse.

Place, publisher, year, edition, pages
2013. Vol. 111, no 12, 121101- p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-209477DOI: 10.1103/PhysRevLett.111.121101ISI: 000324489200002OAI: oai:DiVA.org:uu-209477DiVA: diva2:659078
Available from: 2013-10-24 Created: 2013-10-21 Last updated: 2017-12-06Bibliographically approved

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Graham, Daniel B.

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