Direct observations of a surface eigenmode of the dayside magnetopause

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dc.contributor.authorArcher, M.O.en
dc.contributor.authorHietala, H.en
dc.contributor.authorHartinger, Michael D.en
dc.contributor.authorPlaschke, F.en
dc.contributor.authorAngelopoulos, Vassilisen
dc.contributor.departmentElectrical and Computer Engineeringen
dc.date.accessioned2019-04-01T13:54:52Zen
dc.date.available2019-04-01T13:54:52Zen
dc.date.issued2019-02-12en
dc.description.abstractThe abrupt boundary between a magnetosphere and the surrounding plasma, the magnetopause, has long been known to support surface waves. It was proposed that impulses acting on the boundary might lead to a trapping of these waves on the dayside by the ionosphere, resulting in a standing wave or eigenmode of the magnetopause surface. No direct observational evidence of this has been found to date and searches for indirect evidence have proved inconclusive, leading to speculation that this mechanism might not occur. By using fortuitous multipoint spacecraft observations during a rare isolated fast plasma jet impinging on the boundary, here we show that the resulting magnetopause motion and magnetospheric ultra-low frequency waves at well-defined frequencies are in agreement with and can only be explained by the magnetopause surface eigenmode. We therefore show through direct observations that this mechanism, which should impact upon the magnetospheric system globally, does in fact occur. © 2019, The Author(s).en
dc.description.notesWe acknowledge valuable discussions within the International Space Science Institute (ISSI), Bern, team 350 “Jets downstream of collisionless shocks”, led by F.P. and H.H. We also thank D. Burgess for helpful discussions. H.H. was supported by NASA NNX17AI45G and the Turku Collegium for Science and Medicine. M.D.H. was supported by the NASA NNX17AD35G. We acknowledge NASA contract NAS5-02099 for use of data from the THEMIS Mission. Specifically K. H. Glassmeier, U. Auster and W. Baumjohann for the use of FGM data provided under the lead of the Technical University of Braunschweig and with financial support through the German Ministry for Economy and Technology and the German Center for Aviation and Space (DLR) under contract 50 OC 0302; C. W. Carlson and J. P. McFadden for use of ESA data; D. Larson and the late R. P. Lin for use of SST data; and J. W. Bonnell and F. S. Mozer for EFI data. We acknowledge Wind plasma (courtesy of S. Bale and the late R. P. Lin) and magnetic field (courtesy of R. Lepping and A. Szabo) data. We acknowledge Oleg Troshichev and the Department of Geophysics, Arctic and Antarctic Research Institute for ground magnetometer data.en
dc.format.mimetypeapplication/pdfen
dc.identifier.doihttps://doi.org/10.1038/s41467-018-08134-5en
dc.identifier.issn20411723en
dc.identifier.issue1en
dc.identifier.other615en
dc.identifier.pmid30755606en
dc.identifier.urihttp://hdl.handle.net/10919/88785en
dc.identifier.volume10en
dc.language.isoenen
dc.publisherNature Publishing Groupen
dc.rightsCreative Commons Attribution 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en
dc.titleDirect observations of a surface eigenmode of the dayside magnetopauseen
dc.title.serialNature Communicationsen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten

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