A5061197656- Solar and Space Plasma Dynamics
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Geomagnetism and Paleomagnetism Studies
- Atmospheric Ozone and Climate
- Ionosphere and magnetosphere dynamics
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- Astronomy and Astrophysical Research
- Atomic and Molecular Physics
- Atomic and Subatomic Physics Research
- Solar Radiation and Photovoltaics
- Spacecraft and Cryogenic Technologies
- Magneto-Optical Properties and Applications
- Earthquake Detection and Analysis
- Gamma-ray bursts and supernovae
- High-pressure geophysics and materials
- Quantum Electrodynamics and Casimir Effect
- Radiation Therapy and Dosimetry
- Astrophysics and Star Formation Studies
- Spectroscopy and Quantum Chemical Studies
- Scientific Research and Discoveries
- GNSS positioning and interference
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced Chemical Physics Studies
Universidad de La Laguna
2014-2024
Instituto de Astrofísica de Canarias
2015-2024
High Altitude Observatory
2016-2017
NSF National Center for Atmospheric Research
2016-2017
University Corporation for Atmospheric Research
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 We report the first detection of a magnetic discontinuity in upper solar chromosphere associated with coronal loop brightening. Our findings are based on novel observations obtained by Chromospheric LAyer SpectroPolarimeter (CLASP2.1) suborbital space experiment. During its short 6 minute flight, CLASP2.1 successfully spectropolarimetric data across Mg ii h and k lines, which allowed us to map longitudinal field at multiple heights active region. our observation, we found...
A novel space experiment achieves an unprecedented map of solar magnetic fields from the photosphere to base corona.
The magnetic field is the main driver of activity in solar upper atmosphere, but its measurement notoriously difficult. In order to determine chromosphere, transition region, and corona, we need measure interpret polarization signals that scattering anisotropic radiation Hanle Zeeman effects introduce emitted spectral line radiation. A number recent advances have activated development this research field. ▪ quantum theory generation transfer polarized allows us explain observed chromospheric...
We investigated the formation of Mg II h-k doublet in a weakly magnetized atmosphere (20-100 G) using newly developed numerical code for polarized RT plane-parallel geometry, which implements recent formulation partially coherent scattering by multi-term atoms arbitrary magnetic field regimes. Our results confirm importance partial redistribution effects h and k lines, as pointed out previous work non-magnetic case. show that presence can produce measurable modifications broadband linear...
One of the key research problems in stellar physics is to decipher small-scale magnetic activity quiet solar atmosphere. Recent magneto-convection simulations that account for dynamo action have provided three-dimensional (3D) models photosphere characterized by a high degree activity, similar found through theoretical interpretation scattering polarization observed Sr I 4607 \AA\ line. Here we present results novel investigation Hanle effect this resonance line, based on 3D radiative...
We carry out a theoretical study of the polarization solar Mg II h-k doublet (including its extended wings) and subordinate UV triplet around 280 nm. These lines are great diagnostic interest, as they encode information on physical properties atmosphere from upper photosphere to chromosphere-corona transition region. base our radiative transfer calculations spectral line in one-dimensional models quiet plage regions atmosphere. Our take into account combined action atomic polarization,...
Abstract The CLASP2 (Chromospheric LAyer Spectro-Polarimeter 2) sounding rocket mission was launched on 2019 April 11. measured the four Stokes parameters of Mg ii h and k spectral region around 2800 Å along a 200″ slit at three locations solar disk, achieving first spatially spectrally resolved observations polarization in this near-ultraviolet region. focus work presented here is center-to-limb variation linear across these resonance lines, which produced by scattering anisotropic...
Abstract We present the Tenerife Inversion Code (TIC), which has been developed to infer magnetic and plasma properties of solar chromosphere transition region via full Stokes inversion polarized spectral lines. The code is based on HanleRT forward engine, takes into account many physical mechanisms that are critical for a proper modeling profiles lines originating in tenuous highly dynamic plasmas region: scattering polarization produced by quantum level imbalance interference (atomic...
Abstract The sizable linear polarization signals produced by the scattering of anisotropic radiation in core Ca i 4227 Å line constitute an important observable for probing inhomogeneous and dynamic plasma lower solar chromosphere. Here we show results a three-dimensional (3D) radiative transfer complete frequency redistribution investigation line’s magnetohydrodynamical 3D model atmosphere. We take into account not only Hanle effect model’s magnetic field but also symmetry breaking caused...
Multi-line spectropolarimetric observations allow the simultaneous inference of magnetic field in different layers solar atmosphere and provide insight into how these are magnetically coupled. The new upgrade Gregor Infrared Spectrograph (GRIS) instrument offers such a possibility by allowing for observation Ca ii line at 8542 Å, Si i 10827 He triplet 10830 Å , addition to some additional weaker spectral lines that can probe greater depth photosphere. Because sensitive plasma properties...
We apply the Tenerife Inversion Code (TIC) to plage spectropolarimetric observations obtained by Chromospheric LAyer SpectroPolarimeter (CLASP2). These unprecedented data consist of full Stokes profiles in spectral region around Mg II h and k lines for a single slit position, with two thirds 200 arcsec crossing rest an enhanced network. A former analysis these had allowed us infer longitudinal component magnetic field applying weak approximation (WFA) circular polarization profiles, assign...
The sounding rocket Chromospheric Lyman-Alpha SpectroPolarimeter (CLASP) was launched on September 3rd, 2015, and successfully detected (with a polarization accuracy of 0.1 %) the linear signals (Stokes Q U) that scattering processes were predicted to produce in hydrogen Lyman-alpha line (Lyα; 121.567 nm). Via Hanle effect, this unique data set may provide novel information about magnetic structure energetics upper solar chromosphere. CLASP instrument safely recovered without any damage we...
Context. The correct modeling of the scattering polarization signals observed in several strong resonance lines requires taking partial frequency redistribution (PRD) phenomena into account. Aims. This work aims at assessing impact and range validity angle-averaged AA approximation with respect to general angle-dependent (AD) treatment PRD effects lines, focus on solar Ca i 4227 {\AA} line. Methods. Spectral line is modeled by solving radiative transfer problem for polarized radiation, under...
The Mg II k resonance line is commonly used for diagnosing the solar chromosphere. We theoretically investigated its intensity and polarization in prominences, taking 3D radiative transfer Hanle Zeeman effects into account. an optically thick model representative of a prominence applied several inversion methods to synthetic Stokes profiles, clarifying their pros cons inferring magnetic fields. conclude that self-consistent with necessary determine field vector, although geometry cannot be...
The inversion of spectropolarimetric observations the solar upper atmosphere is one most challenging goals in physics. If we account for all relevant ingredients spectral line formation process, such as three-dimensional (3D) radiative transfer out local thermodynamic equilibrium (NLTE), task becomes extremely computationally expensive. Instead generalizing 1D methods to 3D, have developed a new approach inverse problem. In our meshfree method, do not consider requirement 3D NLTE consistency...
Abstract The Mg ii h and k lines are among the strongest in near-ultraviolet solar spectrum their line core originates upper chromosphere, just below transition region. Consequently, they have become one of main targets for investigating magnetism atmosphere. recent Chromospheric Layer Spectropolarimeter (CLASP2) mission obtained unprecedented spectropolarimetric data on these an active region plage, which already been used to infer longitudinal component magnetic field by applying...
We consider the vector emissivity of polarized radiation transfer in a $\Lambda$-type atomic transition, which we recently proposed order to account for both CRD and PRD contributions scattered radiation. This expression can concisely be written as $$\varepsilon=\left(\varepsilon^{(1)} -\varepsilon^{(2)}_{\rm f.s.} \right) +\varepsilon^{(2)}\;$$ where $\varepsilon^{(1)}$ $\varepsilon^{(2)}$ are terms describing, respectively, one-photon two-photon processes atom, %the fully partially...
Abstract We discuss the implementation of physically meaningful branching ratios between CRD and partial redistribution contributions to emissivity a polarized multi-term atom in presence both inelastic elastic collisions. Our derivation is based on recent theoretical formulation partially coherent scattering, it relies heuristic diagrammatic analysis various radiative collisional processes determine proper form ratios. The expression we obtain for <?CDATA ${\boldsymbol{\varepsilon...
We report on spectropolarimetric observations across the Mg ii h and k lines at 2800 Å made by Ultraviolet Spectrometer Polarimeter board Solar Maximum Mission satellite. Our analysis confirms strong linear polarization in wings of both observed near limb, as previously reported, but also demonstrates presence a negatively (i.e., radially oriented) polarized signal between two lines. find evidence for fluctuations pattern over broad spectral range, resulting some depolarization with respect...
We study the circular polarization of Mn I resonance lines at 279.56, 279.91, and 280.19 nm (hereafter, UV multiplet) by means radiative transfer modeling. In 2019, CLASP2 mission obtained unprecedented spectropolarimetric data in a region solar ultraviolet including Mg II h k two subordinate triplet, as well lines. The first analysis such data, particular those corresponding to plage region, allowed inference longitudinal magnetic field from photosphere upper chromosphere just below...
Abstract Radiative transfer investigations of the solar Mg ii h and k resonance lines around 280 nm have shown that, while their circular polarization (Stokes V ) signals arise from Zeeman effect, linear profiles Q U are dominated by scattering anisotropic radiation Hanle magneto-optical (MO) effects. Using unprecedented observations Mn i obtained Chromospheric LAyer Spectro-Polarimeter (CLASP2), here we investigate how at different wavelengths (i.e., center, near far wings line) vary with...
Context. Measurable linear scattering polarization signals have been predicted and detected at the solar disk center in cores of chromospheric lines. These forward-scattering signals, which are high interest for magnetic field diagnostics, always modeled either under assumption complete frequency redistribution (CRD), or taking partial (PRD) effects into account angle-averaged (AA) approximation. Aims. The aim this work is to assess suitability CRD PRD–AA approximations modeling produced by...
Abstract We apply the HanleRT Tenerife Inversion Code to spectropolarimetric observations obtained by Chromospheric Layer Spectropolarimeter. This suborbital space experiment measured variation with wavelength of four Stokes parameters in near-ultraviolet spectral region Mg ii h and k lines over a solar disk area containing part an active plage edge sunspot penumbra. infer stratification temperature, electron density, line-of-sight velocity, microturbulent longitudinal component magnetic...
Abstract Solar magnetic fields alter scattering polarization in spectral lines like Sr i at 4607 Å via the Hanle effect, making it a potential diagnostic for small-scale, mixed-polarity photospheric fields. Recently, observational evidence line solar disk center was found. Here, we investigate reliability of reconstruction method that made possible this detection. To end, apply to linear profiles radiation emerging obtained from detailed 3D radiative transfer calculation magneto-hydrodynamic...