Buscar
Mostrando ítems 1-10 de 59
Distribution of electric currents in sunspots from photosphere to corona
(Iop Publishing, 2014-09-20)
We present a study of two regular sunspots that exhibit nearly uniform twist from the photosphere to the corona. We derive the twist parameter in the corona and in the chromosphere by minimizing the difference between the ...
Probable Value for the Next Sunspot Minimum
(Hindawi Publishing Corporation, 2014-02)
Gumbel first distribution is applied to smoothed monthly mean sunspot numbers for solar cycles 10 to 24. According to that, the next minimum for solar cycle 24-25 transition would be the deepest solar minimum of the last ...
Small-scale and Global Dynamos and the Area and Flux Distributions of Active Regions, Sunspot Groups, and Sunspots: A Multi-database Study
(IOP Publishing, 2015-01)
In this work we take advantage of eleven different sunspot group, sunspot, and active region databases to characterize the area and flux distributions of photospheric magnetic structures. We find that, when taken separately, ...
A new imminent grand minimum?
(Cambridge University Press, 2011-10)
The planetary hypothesis of solar cycle is an old idea by which the planetary gravity acting on the Sun might have a non-negligible effect on the solar magnetic cycle. The advance of this hypothesis is based on phenomenological ...
A note on the recent use of tree-ring data to investigate a Sun-Amazon River link
(Elsevier Science, 2020-04)
In a recent study, a tree-ring oxygen isotope record (1800–2013) was used as a proxy for Amazon River discharge in order to investigate a solar influence on this river. Here we reinterpreted the results from this study by ...
Evolution of the Global Temperature Structure of the Solar Corona During the Minimum between Solar Cycles 23 and 24
(Iop Publishing Ltd, 2013-07-19)
The combination of Differential Emission Measure Tomography (DEMT) with extrapolation of the photospheric magnetic field allows determinatio/n of the electron density and electron temperature along individual magnetic field ...
Evolution of spinning and braiding helicity fluxes in solar active region NOAA 10930
(IOP Publishing, 2011-12)
The line-of-sight magnetograms from Solar Optical Telescope Narrowband Filter Imager observations of NOAA Active Region 10930 have been used to study the evolution of spinning and braiding helicities over a period of five ...
Shallow sunspot formation, a numerical study using ILES
(Universidade Federal de Minas GeraisUFMG, 2017-02-17)
Sunspots are dark patches at the surface of the Sun where the magnetic field is strong. To the date, the mechanism by which sunspots are generated remains unclear. In the current literature two types of explanations can ...
Annual sunspot numbers
(Wolfram Demonstration Project, 2016)