Properties of lower hybrid drift waves in the magnetotail

Details Properties of lower hybrid drift waves in the magnetotail Properties of lower hybrid drift waves in the magnetotail

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm51a2057n&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM51A-2057

Physics

[2712] Magnetospheric Physics / Electric Fields, [2748] Magnetospheric Physics / Magnetotail Boundary Layers, [2772] Magnetospheric Physics / Plasma Waves And Instabilities

Scientific paper

The lower hybrid drift instability produce small scale (k⊥ρ e ˜ 1) high amplitude turbulence. It is often mentioned in connection to magnetic reconnection, but its role remains controversial. We analyze in detail three events from 2007 when Cluster were located in the magnetotail. Two satellites were at electron gyroradius distance perpendicular to the magnetic field. We identify strong electric fields up to 100 mV/m within current layers of about one ion gyroradius thickness. The turbulent electric fields are interpreted as lower hybrid drift waves through existence conditions, frequency and wavelength. Through cross spacecraft correlation we calculate the drift speed and electrostatic potential. The latter is comparable to the electron temperature and are in the form of vortices. The vortex flows associated with these vortices create a fluctuating magnetic field that is directly observable in an independent set of data. This makes it possible, in similar events, to reasonably estimate the electrostatic potential with use of magnetic field data from one spacecraft only. The results are also of high importance to the upcoming MMS mission.

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