• Refine Query
  • Source
  • Publication year
  • to
  • Language
  • 1
  • Tagged with
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • 1
  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

N?o-extensividade no contexto da atividade magn?tica solar: o problema da assimetria hemisf?rica

Batista, Leonardo Fabr?cio Gomes 14 February 2014 (has links)
Submitted by Automa??o e Estat?stica (sst@bczm.ufrn.br) on 2016-03-03T19:30:20Z No. of bitstreams: 1 LeonardoFabricioGomesBatista_DISSERT.pdf: 3841254 bytes, checksum: abd84ae11417eff1412d173ea11146e6 (MD5) / Approved for entry into archive by Arlan Eloi Leite Silva (eloihistoriador@yahoo.com.br) on 2016-03-04T23:58:19Z (GMT) No. of bitstreams: 1 LeonardoFabricioGomesBatista_DISSERT.pdf: 3841254 bytes, checksum: abd84ae11417eff1412d173ea11146e6 (MD5) / Made available in DSpace on 2016-03-04T23:58:19Z (GMT). No. of bitstreams: 1 LeonardoFabricioGomesBatista_DISSERT.pdf: 3841254 bytes, checksum: abd84ae11417eff1412d173ea11146e6 (MD5) Previous issue date: 2014-02-14 / Indicadores de atividade solar, tais como; n?umero de manchas solares, ?area das manchas e flares sobre a fotosfera do Sol n?ao s?ao distribu??dos de forma sim?etrica entre os hemisf?erios norte e sul. Este comportamento ?e tamb?em conhecido como Assimetria NorteSul dos diferentes ??ndices solares. Dentre as diferentes conclus?oes obtidas por diversos autores, pode-se apontar que a assimetria N-S ?e um fen?omeno sistem?atico e real, e n?ao devido `a variabilidades aleat?orias. No presente trabalho, as distribui?c?oes de probabilidade dos dados provenientes do sat?elite Marshall Space Flight Centre (MSFC) da NASA s?ao investigadas usando uma ferramenta estat??stica originada da bem conhecida Mec?anica Estat??stica N?ao-Extensiva proposta por C. Tsallis em 1988. Nesse contexto, apresenta-se resultados e discuss?oes com suas implica?c?oes f??sicas, confrontando o modelo te?orico com as observa?c?oes realizadas. Os resultados obtidos revelam que existe uma forte depend?encia entre o par?ametro entr?opico n?ao-extensivo q e a variabilidade de longo-termo presente nos dados de ?areas de manchas solares. Dentre os resultados mais importantes, destaca-se a assimetria do ??ndice q, a qual revela o dom??nio predominante do hemisf?erio norte em rela?c?ao ao sul. Esse comportamento foi discutido e confirmado por v?arios autores, por?em em nenhum momento estes atribu??ram tal comportamento `a uma propriedade estat??stica do modelo por eles empregado. Com isso, conclui-se que tal par?ametro pode ser considerado como uma medida eficiente para diagnosticar varia?c?oes de longo-termo do d??namo solar. Finalmente, a referida disserta?c?ao abre um novo caminho para investigar s?eries temporais em Astrof??sica pela ?otica da n?ao-extensividade. / Solar activity indicators, each as sunspot numbers, sunspot area and flares, over the Sun?s photosphere are not considered to be symmetric between the northern and southern hemispheres of the Sun. This behavior is also known as the North-South Asymmetry of the different solar indices. Among the different conclusions obtained by several authors, we can point that the N-S asymmetry is a real and systematic phenomenon and is not due to random variability. In the present work, the probability distributions from the Marshall Space Flight Centre (MSFC) database are investigated using a statistical tool arises from well-known Non-Extensive Statistical Mechanics proposed by C. Tsallis in 1988. We present our results and discuss their physical implications with the help of theoretical model and observations. We obtained that there is a strong dependence between the nonextensive entropic parameter q and long-term solar variability presents in the sunspot area data. Among the most important results, we highlight that the asymmetry index q reveals the dominance of the North against the South. This behavior has been discussed and confirmed by several authors, but in no time they have given such behavior to a statistical model property. Thus, we conclude that this parameter can be considered as an effective measure for diagnosing long-term variations of solar dynamo. Finally, our dissertation opens a new approach for investigating time series in astrophysics from the perspective of non-extensivity.

Page generated in 0.0634 seconds