Actividades sencillas de astrof??sica

Se trata de una gu??a escolar para los profesores, realizada por la Asociaci??n para la Ense??anza de la Astronom??a (ApEA), en la que se dan a conocer los principios b??sicos de astronom??a. En esta obra se han recopilado 13 actividades, que est??n relacionadas con los conceptos de la astrof??sica. En las actividades se realizan estimaciones relacionadas con la astrof??sica, como calcular la distancia a las estrellas, calcular la luminosidad del Sol o conocer el n??mero de estrellas de la galaxia. Se realizan observaciones sencillas de temas complejos, como de las emisiones de radio de J??piter, los meteoritos que provienen de la formaci??n del sistema solar o del espectro de emisi??n de gases calientes. Se realizan modelos de conceptos usados en astrof??sica como la expansi??n del Universo, la curvatura del espacio, las distancias en el sistema solar, los cr??teres de impacto, el n??cleo de un cometa, o la explosi??n de una supernova. Las actividades proceden de p??ginas de Internet, libros y revistas, de los encuentros de la Asociaci??n para la Ense??anza de la Astronom??a y otras desarrolladas por alumnos en el aula.

La f??sica que ve del cel

Resumen basado en el de la publicaci??n

Una mirada al cosmos

En portada: Instituto de Astrof??sica de Andaluc??a (IAA)

Não-extensividade no contexto da atividade magnética solar: o problema da assimetria hemisférica

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.