Detalhes bibliográficos
| Ano de defesa: |
2016 |
| Autor(a) principal: |
Manilo Soares Marques |
| Orientador(a): |
Ezequiel Echer,
Maria Virginia Alves |
| Banca de defesa: |
Jean Pierre Raulin,
Luiz Fernando Ziebell,
Francisco Carlos Rocha Fernandes |
| 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/2016/10.27.08.14
|
Resumo: |
Jupiter is a complex radio source in the decameter wavelength range. The emission is anisotropic, intrinsically variable at milliseconds to hour timescales, and modulated by various causes at longer timescales, from $\sim$10h to months or years (Jovian day and year, season, solar activity and solar wind, and - for ground-based observations, terrestrial day and year). As a consequence, long-term observations and their statistical study have proved necessary to disentangle and understand the observed phenomena. We have built a database from the available 26 years of systematic, daily observations carried on at the Nançay Decameter Array and recorded in digital format. This database contains all observed emissions, classified with respect to their dominant circular polarization, time-frequency morphology, and maximum frequency. We perform a first statistical analysis of its content. We confirm the earlier classification in Io-A, -A${'}$, -B, -C, -D and non-Io-A, -B, -C types, but we also identify new emission components: Io-A${''}$, Io-B${'}$ and non-Io-D. We determine the exact contours of all emission components in the CML-$\Phi$Io (Central Meridian Longitude versus Io Phase) plane, providing representative examples of their typical time-frequency shapes, and the distribution of emissions maximum frequency as a function of $\Lambda$$_{Io}$ (Io${'}$s Longitude). We present general statistical results on each components occurrence rate, duration, intensity and polarization. We also develop a study of the long-term variabilities (declination, solar activity and synodic period) and we show how they can affect the occurrence probability in the CML-$\Phi$Io plane and their implication. |
