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Förslaget inkom 2010-06-09

Principal Components and Pattern Recognition of Kelvin-Helmholtz waves

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Kelvin-Helmholtz (KH) waves can develop between any two fluids that are separated by a velocity shear. They can for example be seen in cloud formations at the Earth or as colorful wave patterns in the atmospheres of Jupiter and Saturn. In space plasma physics, The Kelvin-Helmholtz instability is believed to be an important means for the transfer of energy, plasma and momentum into the near Earth environment: As the solar wind flows past the magnetosphere, regions of high velocity shear is established on the magnetospheric flanks, which in turn leads to the development of KH waves and allow the cold and dense solar wind plasma to enter into the magnetosphere.

The aim of the project is use Principal Component Analysis to derive a classification scheme for KH vortices using data from the Cluster and Geotail spacecraft. The principal components will be useful for determining the generalized behaviour of the instability, and may provide a physical insight on how these vortices develop. The classification can be used both for pattern recognition of KH vortices, and for determining differences and similarities between KH waves on Mercury, Venus, Earth and Saturn.

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