Compressional Waves in the Current Sheet: A Cluster Study

Details Compressional Waves in the Current Sheet: A Cluster Study Compressional Waves in the Current Sheet: A Cluster Study

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72a0605v&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM72A-0605

Physics

2730 Magnetosphere: Inner, 2752 Mhd Waves And Instabilities, 2794 Instruments And Techniques

Scientific paper

It has been shown that compressional waves are responsible for the main wave power in the Earth's current sheet. Case and statistical studies based on single spacecraft observations have been presented, e.g. Bauer et al. [JGR 100, 9605, 1995; JGR 100, 23737, 1995]. In this new aera, since Cluster was launched in 2000, we have obtained a large set of current sheet crossings with simultaneous magnetic field measurements by the four spacecraft. Our study focusses on the data when Cluster had its apogee in the magnetotail at 19 R E, and the spacecraft were in a almost perfect tetrahedron with an interspacing of approximately 2000 km (in 2001) and 4000 km (in 2002). Volwerk et al. [Annales Geophys., in press, 2002] have shown case studies of wave power during various magnetospheric activity stages for the 2001 data. In this study we use the full set of current sheet crossings and determine the general wave properties from the unique three dimensional point of view of Cluster. The different spacing of the spacecraft during the two magnetotail missions give a unique view of the processes in this active region of the magnetosphere.

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