Kinetic Evidence of Magnetic Reconnection Due to Kelvin-Helmholtz Waves

• Published in: Geophysical research letters Vol. 43; no. 11; pp. 5635 - 5643
• Main Authors: Li, W., Andre, M., Khotainstev, Yu. V., Vaivads, A., Graham, D. B., Toledo-Redondo, S., Norgren, C., Henri, P., Wang, C., Tang, B. B., Lavraud, B., Vernisse, Y., Turner, D. L., Burch, J., Torbert, R., Magnes, W., Russell, C. T., Blake, J. B., Mauk, B., Giles, B., Pollock, C., Avanov, L. A., Dorelli, J. C., Gershman, D. J.., Paterson, W. R.
• Format: Journal Article
• Language: English
• Published: Goddard Space Flight Center American Geophysical Union 16.06.2016; John Wiley & Sons, Inc
• Subjects: Alignment; Boundary layer; Boundary layers; Density; Direction; Earth; Earth science; Earth Sciences; Energy; Geophysics; High density; Instability; Interplanetary magnetic field; Interplanetary magnetic fields; Ions; Jets; Kelvin-Helmholtz wave; Kelvin-Helmholtz waves; kinetic evidence; Kinetics; Lines; Magnetic field; Magnetic fields; Magnetic reconnection; Magnetism; Magnetopause; Magnetosheath; Magnetosheath electrons; Magnetosheath ions; Magnetosphere; Magnetospheres; Magnetospheric electrons; Multiscale analysis; reconnection; Sciences of the Universe; Solar wind; Space Sciences (General); Stability; Trailing edges
• ISSN: 0094-8276; 1944-8007; 1944-8007
• DOI: 10.1002/2016gl069192

The Kelvin-Helmholtz (ICH) 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 Multlscale (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 80 keV 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.