A5035378313- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Solar Radiation and Photovoltaics
- Atmospheric Ozone and Climate
- Ionosphere and magnetosphere dynamics
- Gamma-ray bursts and supernovae
- Geophysics and Gravity Measurements
- GNSS positioning and interference
- Space Satellite Systems and Control
- Astronomy and Astrophysical Research
- History and Developments in Astronomy
- Planetary Science and Exploration
- Geomagnetism and Paleomagnetism Studies
- Methane Hydrates and Related Phenomena
- Astrophysics and Cosmic Phenomena
- Inertial Sensor and Navigation
- Space Science and Extraterrestrial Life
- Astronomical Observations and Instrumentation
- Spectroscopy Techniques in Biomedical and Chemical Research
- CCD and CMOS Imaging Sensors
- Structural Health Monitoring Techniques
- Scientific Research and Discoveries
- Engineering Structural Analysis Methods
- Photovoltaic Systems and Sustainability
Institute of Astrophysics and Space Sciences
2021-2024
University of Coimbra
2012-2024
Instituto de Astrofísica de Andalucía
2020-2023
Max Planck Institute for Solar System Research
2016-2017
Max Planck Society
2016
The European Solar Telescope (EST) is a project aimed at studying the magnetic connectivity of solar atmosphere, from deep photosphere to upper chromosphere. Its design combines knowledge and expertise gathered by physics community during construction operation state-of-the-art telescopes operating in visible near-infrared wavelengths: Swedish 1m (SST), German Vacuum Tower (VTT) GREGOR, French T\'elescope H\'eliographique pour l'\'Etude du Magn\'etisme et des Instabilit\'es Solaires...
Abstract The application of machine learning in solar physics has the potential to greatly enhance our understanding complex processes that take place atmosphere Sun. By using techniques such as deep learning, we are now position analyze large amounts data from observations and identify patterns trends may not have been apparent traditional methods. This can help us improve explosive events like flares, which a strong effect on Earth environment. Predicting hazardous becomes crucial for...
Future ground-based telescopes, such as the 4-metre class facilities DKIST and EST, will dramatically improve on current capabilities for simultaneous multi-line polarimetric observations in a wide range of wavelength bands, from near-ultraviolet to near-infrared. As result, there be an increasing demand fast diagnostic tools, i.e., inversion codes, that can infer physical properties solar atmosphere vast amount data these observatories produce. The advent substantially larger apertures,...
We derive the plage area evolution over last 12 solar cycles employing data from all Ca II K archives available publicly in digital form known to us, including several as yet unexplored archives. analyse more than 290,000 full-disc observations 43 datasets spanning period 1892-2019. All images were consistently processed with an automatic procedure that performs photometric calibration (if needed) and limb-darkening compensation. The processing also accounts for artefacts plaguing many of...
Ever since the very first photometric studies of Centaurs and Kuiper belt objects (KBOs) their visible color distribution has been controversial. This controversy triggered to a prolific debate on origin surface colors these distant icy solar system. Two scenarios have proposed interpret explain large variability colors, hence composition. Are mainly primordial directly related formation region, or are they result evolution processes? To date, no mechanism found that successfully explains...
In this work, we discuss the application of convolutional neural networks (CNNs) as a tool to advantageously initialize Stokes profile inversions. To demonstrate usefulness CNNs, concentrate in paper on inversion LTE profiles. We use observations taken with spectropolarimeter onboard Hinode spacecraft test benchmark. First, carefully analyze data SIR code using given initial atmospheric model. The provides set models that reproduce observations. These are then used train CNN. Afterwards,...
Context. Full-disc observations of the Sun in H α line provide information about solar chromosphere, and particular, filaments, which are dark elongated features that lie along magnetic field polarity-inversion lines. This makes them important for studies magnetism. Because full-disc have been performed at various sites since second half 19th century, with regular photographic data having started beginning 20th they an invaluable source on past Aims. We derive accurate filaments from...
The Mg I b_2 line at 5173 Å is primarily magnetically sensitive to heights between the mid photosphere and low chromosphere, a region that has not been sufficiently explored in solar atmosphere but crucial for understanding magnetic coupling two layers. New generation observatories, both space-borne ground-based, are now performing polarimetric observations of this spectral line, enabling simultaneous measurements with multiple lines. This allows detailed studies magnetism around temperature...
We report the detection of oscillations in slender Ca II H fibrils (SCFs) from high-resolution observations acquired with Sunrise balloon-borne solar observatory. The SCFs show obvious their intensity, but also width. oscillatory behaviors are investigated at several positions along axes SCFs. A large majority signs intensity. Their periods and phase speeds analyzed using a wavelet analysis. width intensity perturbations have overlapping distributions wave period. obtained median values...
We present observations of transverse oscillations in slender Ca II H fibrils (SCFs) the lower solar chromosphere. use a 1 hr long time series high- (spatial and temporal-) resolution seeing-free 0.11 nm wide passband covering line core 396.9 from second flight Sunrise balloon-borne observatory. The entire field view, spanning polarity inversion an active region close to disk center, is covered with bright, thin, very dynamic fine structures. Our analysis reveals prevalence waves SCFs median...
Abstract The implementation of automated methods for sunspot detection is essential to obtain better objectivity, efficiency, and accuracy in identifying sunspots analysing their morphological properties. A desired application the contouring sunspots. In this work, we construct contours from Solar Dynamics Observatory (SDO)/ Helioseismic Magnetic Imager intensity images by means an method based on development mathematical morphology. validated qualitatively – resulting accurately delimit...
Solar pores are intense concentrations of magnetic flux that emerge through the solar photosphere. When compared to sunspots, they much smaller in diameter and can therefore be affected buffeted by neighbouring granular activity generate significant magnetohydrodynamic (MHD) wave energy within their confines. However, observations from ground-based telescope facilities may struggle capture subtle motions synonymous with higher-order MHD signatures because seeing effects produced Earth’s...
Future ground-based telescopes will expand our capabilities for simultaneous multi-line polarimetric observations in a wide range of wavelengths, from the near-ultraviolet to near-infrared. This creates strong demand compare candidate spectral lines establish guideline that are most appropriate each observation target. We focused this first work on Zeeman-sensitive photospheric visible and infrared. examined their polarisation signals response functions using 1D semi-empirical atmosphere....
In this work, we study the accuracy that can be achieved when inferring atmospheric information from realistic numerical magneto-hydrodynamic simulations reproduce spatial resolution will obtain with future observations made by 4m class telescopes DKIST and EST. We first multiple inversion configurations using SIR code Fe I transitions at 630 nm until minor differences between input inferred atmosphere in a wide range of heights. Also, examine how depends on noise level Stokes profiles. The...
We use seeing-free high spatial resolution Ca II H data obtained by the SUNRISE observatory to determine properties of slender fibrils in lower solar chromosphere. In this work we intensity images taken with SUFI instrument line during second scientific flight identify and track elongated bright structures. After identification, analyze theses structures order extract their morphological properties. 598 (SCFs) an average width around 180 km, a length between 500 km 4000 lifetime ~400 s,...
The rapid increase of space debris poses a risk to activities, so it is vital develop countermeasures in terms surveillance prevent possible threats. current Space Surveillance Network majorly composed radar and optical telescopes that regularly observe track objects. However, these measures are limited by size, being able detect only tiny amount debris. Hence, alternative solutions essential for securing the future activities. Therefore, this paper proposes design payload camera breadboard...
Interpreting spectropolarimetric observations of the solar atmosphere takes much longer than acquiring data. The most important reason for this is that model fitting, or "inversion", used to infer physical quantities from extremely slow, because underlying models are numerically demanding. We aim improve speed inference by using a neural network relates input polarized spectra output parameters. first select subset data be interpreted and corresponding standard minimization-based inversion...
Abstract Synthetic observations produced from radiative magnetohydrodynamic simulations have predicted that higher polarization fractions in the quiet solar photosphere would be revealed by increasing total integration time of at GREGOR resolutions. We present recently acquired disk center Fe i 15648.5 Å line obtained with telescope equipped GRIS-IFU during excellent seeing conditions, showing exceptionally high fractions. Our reveal an internetwork region a majority (>60%) magnetized...
Context. Constructing the relevant magnetic field lines from active region modelling data is crucial to understanding underlying instability mechanisms that trigger corresponding eruptions. Aims. We present a flux rope (FR) extraction tool for solar coronal builds upon recent methodology. The newly developed method then compared against its previous iteration. Furthermore, we apply scheme simulations of regions AR12473 (similar our study) and AR11176. compare predecessor study 3D movement...
Context. Penumbral microjets (PMJs) is the name given to elongated jet-like brightenings observed in chromosphere above sunspot penumbrae. They are transient events that last from a few seconds several minutes, and their origin presumed be related magnetic reconnection processes. Previous studies have mainly focused on morphological spectral characteristics, more recently spectropolarimetric signals during maximum brightness stage. Studies addressing temporal evolution of PMJs also been...
Scaling relations are very useful tools for estimating unknown stellar quantities. Within this framework, eclipsing binaries ideal goal because their mass and radius known with a good level of accuracy, leading to improved constraints on the models. We aim provide empirical as function luminosity, metallicity, age. investigate, in particular, impact metallicity age those relations. used multi-dimensional fit approach based data from DEBCat, an updated catalogue binary observations such mass,...