Cluster Observations of Traveling Compression Regions in the Near-Tail

Details Cluster Observations of Traveling Compression Regions in the Near-Tail Cluster Observations of Traveling Compression Regions in the Near-Tail

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm21d..02s&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM21D-02

Physics

2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2764 Plasma Sheet

Scientific paper

Observations of traveling compression regions in the tail lobes accompanied by north-then-south Bz signatures, i.e. NS TCRs, have long been used as indicators of the tailward movement of plasmoid-type flux ropes. South-then-north compression regions, i.e. SN TCRs, are expected to occur in association with the earthward motion of BBF-type flux ropes. However, their interpretation has been problematical because similar magnetic field signatures in single spacecraft observations are also known to be caused by short duration enhancements of the external solar wind pressure. Here we present the first three-dimensional analysis of SN TCRs in the Cluster measurements. The Cluster observations clearly show that these compression regions do, indeed, move earthward. Furthermore, they provide the first direct observations of the plasma sheet "bulge" generating the TCR, and they lend new insights into the nature of the lobe - plasma sheet interface during reconnection events. The implications of these new multi-spacecraft observations for nature of the changes in the configuration of the plasma sheet in response to magnetic reconnection will be discussed.

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