A THEMIS multicase study of dipolarization fronts in the magnetotail plasma sheet

Details A THEMIS multicase study of dipolarization fronts in the magnetotail plasma sheet A THEMIS multicase study of dipolarization fronts in the magnetotail plasma sheet

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11605216r&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A5, CiteID A05216

Physics

Plasma Physics

10

Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Plasma Sheet, Space Plasma Physics: Magnetic Reconnection (2723, 7526), Space Plasma Physics: Particle Acceleration, Space Plasma Physics: Plasma Energization

Scientific paper

We discuss results of a superposed epoch analysis of dipolarization fronts, rapid (δt < 30 s), high-amplitude (δBz > 10 nT) increases in the northward magnetic field component, observed during six Time History of Events and Macroscale Interactions during Substorms (THEMIS) conjunction events. All six fronts propagated earthward; time delays at multiple probes were used to determine their propagation velocity. We define typical magnetic and electric field and plasma parameter variations during dipolarization front crossings and estimate their characteristic gradient scales. The study reveals (1) a rapid 50% decrease in plasma density and ion pressure, (2) a factor of 2-3 increase in high-energy (30-200 keV) electron flux and electron temperature, and (3) transient enhancements of ˜5 mV/m in duskward and earthward electric field components. Gradient scales of magnetic field, plasma density, and particle flux were found to be comparable to the ion thermal gyroradius. Current densities associated with the Bz increase are, on average, 20 nA/m2, 5-7 times larger than the current density in the cross-tail current sheet. Because j · E > 0, the dipolarization fronts are kinetic-scale dissipative regions with Joule heating rates of 10% of the total bursty bulk flow energy.

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