Buscar
Mostrando ítems 31-40 de 56
Medición de la velocidad convectiva en la fotosfera solar
(Universidad de los AndesFísicaFacultad de CienciasDepartamento de Física, 2017)
En este trabajo se estudia el fenómeno de granulción en el Sol con el objetivo de obtener una medición indirecta de la velocidad convectiva del gas en la fotosfera solar. Se estudian las bisectrices de 42 líneas fuertes ...
Não-extensividade no contexto da atividade magnética solar: o problema da assimetria hemisférica
(Universidade Federal do Rio Grande do NorteBrasilUFRNPROGRAMA DE PÓS-GRADUAÇÃO EM FÍSICA, 2014-02-14)
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 ...
Herschel observations of the debris disc around HIP 92043*
(Astronomy & Astrophysics, 2013)
The Global Context of Solar Activity During the Whole Heliosphere Interval Campaign
(Springer, 2011-12)
The Whole Heliosphere Interval (WHI) was an international observing and modeling effort to characterize the 3-D interconnected “heliophysical” system during this solar minimum, centered on Carrington Rotation 2068, March ...
Estudo espectroscópico da atividade cromosférica em estrelas do tipo solar: a busca por caracterizar estrelas análogas em mínimo de Maunder
(Universidade Federal do Rio Grande do NorteBrasilUFRNPROGRAMA DE PÓS-GRADUAÇÃO EM FÍSICA, 2021-06-11)
Since the first observations of sunspots made by Thomas Harriot and subsequently by
Galileo and several other scientists, astronomers looked for methods to better understand
the magnetic phenomena in the Sun and in solar-type ...
The long-term evolution of AR 7978: Testing coronal heating models
(IOP Publishing, 2003-12)
We derive the dependence of the mean coronal heating rate on the magnetic flux density. Our results are based on a previous study of the plasma parameters and the magnetic flux density (B) in the active region NOAA 7978 ...
What is the source of the magnetic helicity shed by CMEs? The long-term helicity budget of AR 7978
(EDP Sciences, 2002-02)
An isolated active region (AR) was observed on the Sun during seven rotations, starting from its birth in July 1996 to its full dispersion in December 1996. We analyse the long-term budget of the AR relative magnetic ...
Abundances in the Herbig Ae star HD 101412. Abundance anomalies; λ Boo-Vega characteristics?
(Edp Sciences, 2010-11)
Context. Recent attention has been directed to abundance variations among very young stars.
Aims. We perform a detailed abundance study of the Herbig Ae star HD 101412, taking advantage of its unusually sharp spectral ...