Physics
Scientific paper
Dec 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm21b0206f&link_type=abstract
American Geophysical Union, Fall Meeting 2003, abstract #SM21B-0206
Physics
2752 Mhd Waves And Instabilities, 2764 Plasma Sheet
Scientific paper
We present an analysis of the propagation of compressive MHD perturbations in a plasmasheet (described as being an Harris-type sheet). We explicitly solve the linear response of the plasmasheet to an initial perturbation by using the Green formalism. Emphasis is made on the continuous eigenmodes of the system linked to the resonant absorption process. Through this phenomenon some energy may be tranferred from the waves to the plasma. Using a quasi-analytical model, we (1) precisely quantify the amount of energy that these MHD waves can deposit in the sheet and (2) evaluate the time and space scales of this transfer. These results are then compared with CLUSTER observations. Using a technique of reconstruction of the signal from actually observed fluctuations, we estimate the amplitude of the continuous modes and we precise the role of the resonant absorption mechanism in the energization of the plasmasheet. This can be considered as a first step for an observational quantization of the possible role of this mechanism in natural plasmas.
Balogh André
Budnik E.
Fruit G.
Génot Vincent
Louarn Ph.
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