Detalhes bibliográficos
| Ano de defesa: |
2017 |
| Autor(a) principal: |
Suzana de Souza e Almeida Silva |
| Orientador(a): |
Maria Virgínia Alves,
Jean Carlo Santos |
| Banca de defesa: |
Luis Eduardo Antunes Vieira,
Iberê Luis Caldas,
Vera Jatenco Silva Pereira |
| Tipo de documento: |
Tese
|
| Tipo de acesso: |
Acesso aberto |
| Idioma: |
eng |
| Instituição de defesa: |
Instituto Nacional de Pesquisas Espaciais (INPE)
|
| Programa de Pós-Graduação: |
Programa de Pós-Graduação do INPE em Geofísica Espacial/Ciências do Ambiente Solar-Terrestre
|
| Departamento: |
Não Informado pela instituição
|
| País: |
BR
|
| Link de acesso: |
http://urlib.net/sid.inpe.br/mtc-m21b/2016/12.24.01.22
|
Resumo: |
In the solar corona, heat flux is one of the key processes of energy transport. Since the coronal plasma can be described as weakly collisional, classical formulation for the heat flux might no longer be the most accurate description. In a medium with fewer collisions, the heat flux will have contributions not only from neighboring particles, but also from particles coming from other regions along the magnetic field line. Hence, a better description of the heat flux in this context might be offered by a nonlocal formulation. We have implemented a non local heat flux in a 3D MHD model and we investigated its effects on the thermal evolution of the system. We simulate the evolution of plasma and magnetic field using this model and considering two different formulations for heat flux: classical (local) and nonlocal one. The initial magnetic field was obtained from a potential extrapolation of the observed line-ofsight component of photospheric magnetic field for AR11226. We evolved the system by imposing a field velocity at the bottom of the simulation box which shifted footpoints of the magnetic field lines. Then we compared the differences in the evolution of plasma obtained using the two different formulations for the heat flux. The inclusion of a nonlocal formulation for heat flux leads to considerable differences in the average temperature profile of the lower atmosphere and transition region compared to classical formulation. There are also remarkable differences concerning the contributions from energy transport and from source terms to the temperature depending on the formulation used. Our results suggest that a different heat flux formulation affects considerably the heating dynamics and temperature evolution of the plasma. |
