Kinetic evidence of magnetic reconnection due to Kelvin-Helmholtz waves
2016 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 43, no 11, 5635-5643 p.Article in journal (Refereed) PublishedText
The Kelvin-Helmholtz (KH) instability at the Earth's magnetopause is predominantly excited during northward interplanetary magnetic field (IMF). Magnetic reconnection due to KH waves has been suggested as one of the mechanisms to transfer solar wind plasma into the magnetosphere. We investigate KH waves observed at the magnetopause by the Magnetospheric Multiscale (MMS) mission; in particular, we study the trailing edges of KH waves with Alfvenic ion jets. We observe gradual mixing of magnetospheric and magnetosheath ions at the boundary layer. The magnetospheric electrons with energy up to 80keV are observed on the magnetosheath side of the jets, which indicates that they escape into the magnetosheath through reconnected magnetic field lines. At the same time, the low-energy (below 100eV) magnetosheath electrons enter the magnetosphere and are heated in the field-aligned direction at the high-density edge of the jets. Our observations provide unambiguous kinetic evidence for ongoing reconnection due to KH waves.
Place, publisher, year, edition, pages
2016. Vol. 43, no 11, 5635-5643 p.
kinetic evidence, reconnection, Kelvin-Helmholtz wave
Astronomy, Astrophysics and Cosmology
IdentifiersURN: urn:nbn:se:uu:diva-301046DOI: 10.1002/2016GL069192ISI: 000379851800012OAI: oai:DiVA.org:uu-301046DiVA: diva2:953568
FunderSwedish National Space Board, 164/14, 176/15