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Numerical study of upper hybrid to Z-mode leakage during electromagnetic pumping of groups of striations in the ionosphere
Univ Strathclyde, Dept Phys, SUPA, Glasgow G4 0NG, Lanark, Scotland..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division. Swedish Inst Space Phys, S-75121 Uppsala, Sweden..
2015 (English)In: Annales Geophysicae, ISSN 0992-7689, E-ISSN 1432-0576, Vol. 33, no 8, 1019-1030 p.Article in journal (Refereed) Published
Abstract [en]

We investigate numerically the interaction between ionospheric magnetic field-aligned density striations and a left-hand circularly polarized (L)-mode wave. The L-mode wave is scattered into upper hybrid (UH) waves which are partially trapped in the striations, but leak energy to electromagnetic waves in the Z-mode branch. For small-amplitude (1 %) striations, this loss mechanism leads to a significant reduction in amplitude of the UH waves. For several striations organized in a lattice, the leaking of Z-mode waves is compensated by influx of Z-mode radiation from neighboring striations, leading to an increased amplitude of the weakly trapped UH waves. For large-amplitude (10 %) striations the trapped UH waves rapidly increase in amplitude far beyond the threshold for parametric instabilities, and the Z-mode leakage is less important. The results have relevance for the growth of striations and the onset of UH and lower hybrid turbulence during electromagnetic high-frequency pumping of ionospheric plasma, which require large-amplitude UH waves.

Place, publisher, year, edition, pages
2015. Vol. 33, no 8, 1019-1030 p.
Keyword [en]
Ionosphere (active experiments, ionospheric irregularities, wave propagation)
National Category
Astronomy, Astrophysics and Cosmology
URN: urn:nbn:se:uu:diva-264337DOI: 10.5194/angeo-33-1019-2015ISI: 000360651100009OAI: oai:DiVA.org:uu-264337DiVA: diva2:860886
Available from: 2015-10-14 Created: 2015-10-09 Last updated: 2015-10-14Bibliographically approved

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Leyser, Thomas B.
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Swedish Institute of Space Physics, Uppsala Division
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