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Mostrando ítems 1-10 de 56
Temporal evolution of fractality in the Earth's magnetosphere and the solar photosphere
(Blackwell Publishing Ltd, 2014)
The study of complexity in two aspects of the magnetic activity in the Sun-Earth system is presented. We compare the temporal evolution of the magnetic fluctuations in the Earth's magnetosphere and the spatial distribution ...
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 ...
Spatial distribution and statistical properties of small-scale convective vortex-like motions in a quiet-Sun region
(Wiley, 2011-09)
High-resolution observations of a quiet-Sun internetwork region taken with the Solar 1-m Swedish Telescope in La Palma are analysed. We determine the location of small-scale vortex motions in the solar photospheric region ...
Both accurate and precise gf-values for Fe II lines
(EDP SCIENCES S A, 2009)
We present a new set of oscillator strengths for 142 Fe II lines in the wavelength range 4000-8000 angstrom. Our gf-values are both accurate and precise, because each multiplet was globally normalized using laboratory data ...
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, ...
Correcting the effect of magnetic tongues on the tilt angle of bipolar active regions
(EDP Sciences, 2019-12)
Context. The magnetic polarities of bipolar active regions (ARs) exhibit elongations in line-of-sight magnetograms during their emergence. These elongations are referred to as magnetic tongues and attributed to the presence ...
A study of a coronal hole associated with a large filament eruption
(2017)
We report the results of a detailed study of an equatorial coronal hole and a dimming region related to the eruptions of a nearby large filament and subsequent coronal mass ejections (CMEs). The dynamic eruptions of the ...
Analysis of a long-duration AR throughout five solar rotations: Magnetic properties and ejective events
(Elsevier, 2019-10)
Coronal mass ejections (CMEs), which are among the most magnificent solar eruptions, are a major driver of space weather and can thus affect diverse human technologies. Different processes have been proposed to explain the ...
A simple model for the evolution of multi-stranded coronal loops
(IOP Publishing, 2010-08-10)
We develop and analyze a simple cellular automaton model that reproduces the main properties of the evolution of soft X-ray coronal loops. We are motivated by the observation that these loops evolve in three distinguishable ...
Two-dimensional cellular automaton model for the evolution of active region coronal plasmas
(Iop Publishing, 2015-02)
We study a two-dimensional cellular automaton (CA) model for the evolution of coronal loop plasmas. The model is based on the idea that coronal loops are made of elementary magnetic strands that are tangled and stressed ...