A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Direct observations of a surface eigenmode of the dayside magnetopause
Tekijät: Archer MO, Hietala H, Hartinger MD, Plaschke F, Angelopoulos V
Kustantaja: NATURE PUBLISHING GROUP
Julkaisuvuosi: 2019
Journal: Nature Communications
Tietokannassa oleva lehden nimi: NATURE COMMUNICATIONS
Lehden akronyymi: NAT COMMUN
Artikkelin numero: ARTN 615
Vuosikerta: 10
Sivujen määrä: 11
ISSN: 2041-1723
eISSN: 2041-1723
DOI: https://doi.org/10.1038/s41467-018-08134-5
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/39675519
The 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.
Ladattava julkaisu This is an electronic reprint of the original article. |  |
