``Crater'' Flux Transfer Events: Highroad to the X-line?

Details ``Crater'' Flux Transfer Events: Highroad to the X-line? ``Crater'' Flux Transfer Events: Highroad to the X-line?

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm12a..04f&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM12A-04

Physics

[2712] Magnetospheric Physics / Electric Fields, [2799] Magnetospheric Physics / General Or Miscellaneous

Scientific paper

A class of signatures of pulsed reconnection at the magnetopause called ``crater'' flux transfer events was discovered in the AMPTE data sets. Starting with the observation of an untypical temporal profile in the total field strength and the discovery of a magnetic boundary signature within FTEs, delineating an outer region where reconnection was still ongoing, a complex of signatures emerged, leading to the hypothesis of a layered structure in fields and plasmas. This led to a model of FTEs consisting of a bulge of reconnected fields and accelerated/heated plasma moving along the magnetopause past the spacecraft. We use the multi-spacecraft capability of Cluster to further support this model and to unravel the cause of the layering. To this end, we examine four-spacecraft Cluster observations of a ''crater'' FTE, one in a sequence observed in the magnetosphere on an outbound pass of the magnetopause. We employ data from the FGM, CIS, EDI, Whisper and EFW instruments, some at the highest resolution. We focus on the accelerated flows and their directional properties, and electric field fluctuations. By inter-comparing observations at the different spacecraft, spatial structures within the signatures are confirmed. Finally, we relate the observations to processes near the separatrices, electron and ion diffusion regions, and also show signatures of Hall physics.

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