Physics
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm22a0815b&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM22A-0815
Physics
2752 Mhd Waves And Instabilities, 2760 Plasma Convection, 7807 Charged Particle Motion And Acceleration, 7863 Turbulence
Scientific paper
The character of the flow of plasma within the Earth's magnetosphere is of fundamental importance to the distribution and flow of energy within this system. Two dimensional fluid turbulence theory predicts that energy applied at a given scale length will cascade to larger scales whereas enstrophy will cascade to smaller scales. The uncertainty in equating two dimensional fluid theory to space plasmas arises from the limited analysis that can be performed with single spacecraft measurements. However, with multi-spacecraft measurements such as Cluster, we will be able to expand our understanding of plasma flow as a directly measurable function of separation between payloads. The Electron Drift Instrument on board each Cluster satellite directly measures the electron gyro-orbit drift step vector, from which is then derived the plasma flow velocity vector perpendicular to the ambient magnetic field. As a first step in understanding the importance of turbulence within the magnetosphere, this study analyzes the drift velocities measured in high latitude crossings. The velocities are correlated as a function of position using multi baseline payload separations and time to determine flow correlations for various scale lengths. This analysis is used to compare with two dimensional fluid turbulence theory as well as for deriving an insight into the scale lengths of flow structures within the magnetosphere.
Bounds Scott R.
Kletzing Craig A.
Paschmann Goetz
Puhl-Quinn P.
Quinn John M.
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