| Processo: | 10/50298-8 |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Data de Início da vigência: | 01 de agosto de 2010 |
| Data de Término da vigência: | 28 de fevereiro de 2012 |
| Área de conhecimento: | Ciências Exatas e da Terra - Astronomia |
| Pesquisador responsável: | Elisabete Maria de Gouveia Dal Pino |
| Beneficiário: | Maria Soledad Nakwacki |
| Instituição Sede: | Instituto de Astronomia, Geofísica e Ciências Atmosféricas (IAG). Universidade de São Paulo (USP). São Paulo , SP, Brasil |
| Vinculado ao auxílio: | 06/50654-3 - Investigação de fenômenos de altas energias e plasmas astrofísicos: teoria, observação e simulações numéricas, AP.TEM |
| Assunto(s): | Teoria cinética Turbulência Magnetohidrodinâmica |
| Palavra(s)-Chave do Pesquisador: | Collisionless Plasmas | Instabilities | Kinetic Theory | Magnetohydrodynamics | Turbulence |
Resumo Kinetic theory has become an important tool to model the evolution of collisionless plasmas, in particular to deal with the development of turbulence. In recent years, there has been sustained progress in this field, such as the development of numerical codes including the drift kinetic equation obtained from the Vlasov equation, and the derived set of kinetic magnetohydrodynamic equations, in which the anisotropy of pressure is considered. However, there are certain phenomena being currently observed in this kinetic regime which require a deeper numerical and theoretical investigation. In this kinetic MHD regime there are instabilities that give rise to fast growing magnetic fluctuations in the smallest scales. The low density plasma that fills the intergalactic and intracluster media suffers turbulent amplification of the magnetic field due to these instabilities. Other examples of such phenomena are the development of instabilities which may change the energy spectrum in its inertial range, the inhibition of dynamo action by the pressure anisotropy, and the generation of pressure anisotropy via magnetorotational instabilities in collisionless astrophysical objects. The purpose of this project is to study these effects theoretically and numerically using a kinetic MHD approach and to investigate other theoretical approaches that take into account the low collisionality of the intergalactic medium and intracluster medium. (AU) | |
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