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Prolonged Kelvin-Helmholtz Waves at Dawn and Dusk Flank Magnetopause: Simultaneous Observations by MMS and THEMIS
Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing 100190, Peoples R China;Univ Chinese Acad Sci, Chinese Acad Sci, Beijing 100049, Peoples R China.
Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing 100190, Peoples R China;Univ Chinese Acad Sci, Chinese Acad Sci, Beijing 100049, Peoples R China.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Swedish Institute of Space Physics, Uppsala Division. Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing 100190, Peoples R China.ORCID iD: 0000-0003-1920-2406
Chinese Acad Sci, State Key Lab Space Weather, Natl Space Sci Ctr, Beijing 100190, Peoples R China.
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2019 (English)In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 875, no 1, article id 57Article in journal (Refereed) Published
Abstract [en]

The Kelvin-Helmholtz (K-H) waves predominantly excited at the Earth's low-latitude magnetopause were suggested to be dawn-dusk asymmetric. We report a prolonged simultaneous observations of the K-H waves on the dawn and dusk magnetopause by Magnetospheric Multiscale (MMS) and THEMIS-A (THA) spacecraft, respectively. The quasi-periodic K-H waves on both flanks have unambiguous low-density and high-speed patterns. The wave periods vary gradually on both flanks, with similar average periods (303 ± 107 s for MMS and 266 ± 102 s for THA). The lag time between the variations of the wave periods is close to the wave propagation time from THA to MMS, which suggests that the K-H waves generate and propagate quasi-symmetrically on both flanks. Larger local magnetic shear angles are observed on the trailing edges by MMS than by THA, which is probably due to the strong magnetic field distortion during the tailward propagation. The increased magnetic shear may excite magnetic reconnection, thus contributing to the formation of the low-latitude boundary layer.

Place, publisher, year, edition, pages
2019. Vol. 875, no 1, article id 57
Keywords [en]
plasmas, waves
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-382858DOI: 10.3847/1538-4357/ab0e76ISI: 000464984900011OAI: oai:DiVA.org:uu-382858DiVA, id: diva2:1315400
Available from: 2019-05-13 Created: 2019-05-13 Last updated: 2019-05-13Bibliographically approved

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