5,055 research outputs found
Surges and Si IV bursts in the solar atmosphere. Understanding IRIS and SST observations through RMHD experiments
Surges often appear as a result of the emergence of magnetized plasma from
the solar interior. Traditionally, they are observed in chromospheric lines
such as H 6563 \AA and Ca II 8542 \AA. However, whether there is a
response to the surge appearance and evolution in the Si IV lines or, in fact,
in many other transition region lines has not been studied. In this paper we
analyze a simultaneous episode of an H surge and a Si IV burst that
occurred on 2016 September 03 in active region AR12585. To that end, we use
coordinated observations from the Interface Region Imaging Spectrograph (IRIS)
and the Swedish 1-m Solar Telescope (SST). For the first time, we report
emission of Si IV within the surge, finding profiles that are brighter and
broader than the average. Furthermore, the brightest Si IV patches within the
domain of the surge are located mainly near its footpoints. To understand the
relation between the surges and the emission in transition region lines like Si
IV, we have carried out 2.5D radiative MHD (RMHD) experiments of magnetic flux
emergence episodes using the Bifrost code and including the non-equilibrium
ionization of silicon. Through spectral synthesis we explain several features
of the observations. We show that the presence of Si IV emission patches within
the surge, their location near the surge footpoints and various observed
spectral features are a natural consequence of the emergence of magnetized
plasma from the interior to the atmosphere and the ensuing reconnection
processes.Comment: 13 pages, 8 figures. The Astrophysical Journal (Accepted
Stokes theory of thin-film rupture
The structure of the flow induced by the van der Waals destabilization of a
non-wetting liquid film placed on a solid substrate is unraveled by means of
theory and numerical simulations of the Stokes equations. Our analysis reveals
that lubrication theory, which yields where
is the minimum film thickness and is the time until
breakup, cannot be used to describe the local flow close to rupture. Instead,
the slender lubrication solution is shown to experience a crossover to a
universal self-similar solution of the Stokes equations that yields
, with an opening angle of off
the solid.Comment: 12 pages, 7 figure
Polar coherent states in bilayer graphene under a constant uniform magnetic field
Symmetries associated with the Hamiltonian describing bilayer graphene
subjected to a constant magnetic field perpendicular to the plane of the
bilayer are calculated using polar coordinates. These symmetries are then
applied to explain some fundamental properties, such as the spectrum and the
integer pseudo-spin character of the eigenfunctions. The probability and
current densities of the bilayer Hamiltonian have also been calculated in polar
coordinates and shown to be gauge invariant and scalar under generalized
rotations. We also define appropriate coherent states of this system as
eigenfunctions, with complex eigenvalues, of a suitable chose annihilation
operator. In this framework, symmetries are also useful to show the meaning of
the complex eigenvalue in terms of expected values. The local current density
of these coherent states is shown to exhibit a kind of radial component
interference effect, something that has gone unnoticed until now. Some of these
results that have just been exposed are graphically illustrated throughout the
manuscript
Perfiles motivacionales de practicantes en el medio acuático frente al medio terrestre
Ac magnetic susceptibility of a molecular magnet submonolayer directly patterned onto a microSQUID sensor
We report the controlled integration, via Dip Pen Nanolithography, of
monolayer dots of ferritin-based CoO nanoparticles (12 Bohr magnetons) into the
most sensitive areas of a microSQUID sensor. The nearly optimum flux coupling
between these nanomagnets and the microSQUID improves the achievable
sensitivity by a factor 100, enabling us to measure the linear susceptibility
of the molecular array down to very low temperatures (13 mK). This method opens
the possibility of applying ac susceptibility experiments to characterize
two-dimensional arrays of single molecule magnets within a wide range of
temperatures and frequencies.Comment: 4 pages 3 figure
Predicting of excess body fat in children
Purpose of reviewApproximately 370 million children and adolescents worldwide showed overweight or obesity in 2016. The risk of developing severe comorbidities depends on the age of onset and the duration of obesity. This review discusses available methodologies to detect excess body fat in children as well as the early life factors that predict excess body fat and its development.Recent findingsFactors, such as parental nutritional status, maternal weight gain during pregnancy, maternal malnutrition, maternal smoking during pregnancy, low and high birth weight, rapid weight gain, and short infant sleep duration have been independently and positively associated with neonatal, infant, and children adiposity. Early detection of excess body fat in children through the use of various tools is the first step in preventing nutrition-related diseases in adulthood.SummaryThe early detection of excess body fat and the implementation of efficient interventions to normalize the weight of children and adolescents at obesity risk are essential to prevent diseases in adult life. © 2022 Lippincott Williams and Wilkins. All rights reserved
Ambipolar diffusion in the Bifrost code
Ambipolar diffusion is a physical mechanism related to the drift between
charged and neutral particles in a partially ionized plasma that is key in many
different astrophysical systems. However, understanding its effects is
challenging due to basic uncertainties concerning relevant microphysical
aspects and the strong constraints it imposes on the numerical modeling. Our
aim is to introduce a numerical tool that allows us to address complex problems
involving ambipolar diffusion in which, additionally, departures from
ionization equilibrium are important or high resolution is needed. The primary
application of this tool is for solar atmosphere calculations, but the methods
and results presented here may also have a potential impact on other
astrophysical systems. We have developed a new module for the stellar
atmosphere Bifrost code that improves its computational capabilities of the
ambipolar diffusion term in the Generalized Ohm's Law. This module includes,
among other things, collision terms adequate to processes in the coolest
regions in the solar chromosphere. As a key feature of the module, we have
implemented the Super Time-Stepping (STS) technique, that allows an important
acceleration of the calculations. We have also introduced hyperdiffusion terms
to guarantee the stability of the code. We show that to have an accurate value
for the ambipolar diffusion coefficient in the solar atmosphere it is necessary
to include as atomic elements in the equation of state not only hydrogen and
helium but also the main electron donors like sodium, silicon and potassium. In
addition, we establish a range of criteria to set up an automatic selection of
the free parameters of the STS method that guarantees the best performance,
optimizing the stability and speed for the ambipolar diffusion calculations. We
validate the STS implementation by comparison with a self-similar analytical
solution.Comment: Accepted in A&A, 10 pages, 7 figure
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