The Microphysics of the Dipolarization/Jet Braking Region in the Near-Earth Magnetotail: Cluster Multi-Point Observations

Details The Microphysics of the Dipolarization/Jet Braking Region in the Near-Earth Magnetotail: Cluster Multi-Point Observations The Microphysics of the Dipolarization/Jet Braking Region in the Near-Earth Magnetotail: Cluster Multi-Point Observations

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm52a..03r&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SM52A-03

Physics

2723 Magnetic Reconnection (7526, 7835), 2744 Magnetotail, 2788 Magnetic Storms And Substorms (7954), 2790 Substorms

Scientific paper

The dipolarization/jet braking region in the near-Earth magnetotail is a key region associated with magnetic field reconfiguration and electromagnetic energy conversion. While these processes affect large volumes of space, some of the important physics occurs at scales comparable with the ion scale and below. It is therefore important to study this region at different spatial scales. Here we present Cluster measurements of electromagnetic fields and particles during a few dipolarizations (Bz enhancement) on October 27, 2007 when Cluster crossed the plasma sheet around X~-10 RE. The spacecraft separation ranged from ~40 km to ~10000 km thus allowing simultaneous observations at scales from electron to fluid. The observations indicate that turbulent regions where earthward fast flows brake are associated with dipolarizations. Current filaments with strong DC electric fields, waves and energetic particles are observed within such turbulent regions. We analyze in detail several current filaments and discuss their role for local energy conversion and acceleration of energetic particles. We discuss the possible role of small-scale processes within the turbulent dipolarization region for large-scale substorm features.

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