Kink-mode Waves and Bifurcated Current Sheets: CLUSTER Observations and Analysis Techniques

Details Kink-mode Waves and Bifurcated Current Sheets: CLUSTER Observations and Analysis Techniques Kink-mode Waves and Bifurcated Current Sheets: CLUSTER Observations and Analysis Techniques

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh31a1083c&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH31A-1083

Physics

2740 Magnetospheric Configuration And Dynamics, 2744 Magnetotail, 2764 Plasma Sheet, 2794 Instruments And Techniques

Scientific paper

Although the magnetic configuration of the tail current sheet in the moments before reconnection is of considerable interest, many fundamental observational questions remain. What does the large-scale structure typically look like? How thick is the sheet? Is it bifurcated? What bulk wavemodes are active, and at what amplitude? Cluster observations, when combined with multipoint analysis techniques, offer the opportunity to observationally resolve some of these questions. We present an analysis technique that we use to first solve for the local normal vector to the current sheet at each data point, and then to identify the presence and wavemode of large-scale bulk wave modes (e.g. kink modes). We then take this motion into account when reconstructing the large-scale structure of the sheet from the measurements. We apply these techniques to Cluster observations of the tail current sheet before a substorm on the 11th of October, 2001. At the Cluster location 19 Re downtail, we find large-amplitude kink-mode waves that are propagating duskward in the minutes before reconnection onset.

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