Structure and Dynamics of the Plasmapause Region: Cluster Observations

Details Structure and Dynamics of the Plasmapause Region: Cluster Observations Structure and Dynamics of the Plasmapause Region: Cluster Observations

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm21b0380z&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM21B-0380

Physics

2700 Magnetospheric Physics (6939), 2730 Magnetosphere: Inner, 2740 Magnetospheric Configuration And Dynamics, 2768 Plasmasphere, 2772 Plasma Waves And Instabilities (2471)

Scientific paper

The structure and dynamics of the plasmapause region, along with the plumes, are of great interest in understanding the interactions between the plasmasphere and the plasma sheet. Many attempts were made based on ground stations and single-spacecraft observations, which may have some difficulties in analyzing small-scale structures. The Cluster constellation, comprised by 4 satellites, however, provides us a new way to study the configuration of the plasmapause region in more detail. The constellation of Cluster spent around 2 hours per orbit near its perigee traversing the plasmasphere, basically in the z direction. The observed electron density can be clearly seen to be enhanced outside the plasmapause, indicating the existence of plumes in the northward and southward of the plasmasphere. The sequence of the 4 satellites crossing the plume is examined, suggesting the plume normal to be also in the z direction, which may give us a hint in understanding the plume configuration outside the equatorial plane. Also the multi-spacecraft measurements can be used to obtain the temporal and spatial distribution of the magnetic field, implying some characteristics of wave features which may play important roles in wave-particle interactions activating there.

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