Observations of large-amplitude, parallel, electrostatic waves associated with the Kelvin-Helmholtz instability by the magnetospheric multiscale mission
2016 (English)In: Geophysical Research Letters, ISSN 0094-8276, E-ISSN 1944-8007, Vol. 43, no 17, 8859-8866 p.Article in journal (Refereed) Published
On 8 September 2015, the four Magnetospheric Multiscale spacecraft encountered a Kelvin-Helmholtz unstable magnetopause near the dusk flank. The spacecraft observed periodic compressed current sheets, between which the plasma was turbulent. We present observations of large-amplitude (up to 100mV/m) oscillations in the electric field. Because these oscillations are purely parallel to the background magnetic field, electrostatic, and below the ion plasma frequency, they are likely to be ion acoustic-like waves. These waves are observed in a turbulent plasma where multiple particle populations are intermittently mixed, including cold electrons with energies less than 10eV. Stability analysis suggests a cold electron component is necessary for wave growth.
Place, publisher, year, edition, pages
2016. Vol. 43, no 17, 8859-8866 p.
Kelvin-Helmholtz, electrostatic waves, boundary layer, turbulence
Fusion, Plasma and Space Physics Other Earth and Related Environmental Sciences
IdentifiersURN: urn:nbn:se:uu:diva-307757DOI: 10.1002/2016GL070404ISI: 000385357200005OAI: oai:DiVA.org:uu-307757DiVA: diva2:1048329