58 citations · 734 across the 29 of their papers we have counts for
31 papers
Measuring the Expansion of Solar Magnetic Fields with Multiline Inversions from Sunrise III
Juan Carlos Trelles Arjona, María Jesús Martínez González, Christoph Kuckein +34
Magnetic fields in the solar atmosphere are expected to expand with height, forming magnetic canopies that couple the photosphere and chromosphere. Except for sunspots, direct meas…
The Stellar Observations Network Group (SONG) -- A Legacy Archive of Stellar Time-Domain Spectroscopy
M. N. Lund, F. Grundahl, M. S. Fredslund +41
The Stellar Observations Network Group (SONG) network has operated for more than a decade, providing long-baseline, high-cadence spectroscopic observations of bright stars and the…
3DSTokesFlow: simulation-based inference for 3D Stokes profiles using flow matching
A. Asensio Ramos, K. E. Yang, M. J. Martinez Gonzalez +2
The standard interpretation of observed Stokes profiles to infer the physical conditions of the solar atmosphere is inherently an ill-defined problem due to observational noise and…
Solar-cycle and Latitude Variations in the Internetwork Magnetism
Juan Carlos Trelles Arjona, María Jesús Martínez González, Basilio Ruiz Cobo
The importance of the quiet-Sun magnetism is that it is always there to a greater or lesser extent, being a constant provider of energy, independently of the solar cycle phase. The…
Estimating the longitudinal magnetic field in the chromosphere of quiet-Sun magnetic concentrations
S. Esteban Pozuelo, A. Asensio Ramos, J. de la Cruz Rodríguez +2
Details of the magnetic field in the quiet Sun chromosphere are key to our understanding of essential aspects of the solar atmosphere. We aim to determine the longitudinal magnetic…
Inference of the chromospheric magnetic field orientation in the Ca II 8542 A line fibrils
A. Asensio Ramos, J. de la Cruz Rodriguez, M. J. Martinez Gonzalez +1
Solar chromospheric fibrils, as observed in the core of strong chromospheric spectral lines, extend from photospheric field concentrations suggesting that they trace magnetic field…
Synthetic polarimetric spectra from stellar prominences
T. Felipe, M. J. Martínez González, A. Asensio Ramos
Stellar prominences detected in rapidly rotating stars serve as probes of the magnetism in the corona of cool stars. We have synthesized the temporal evolution of the Stokes profil…
Upholding the Unified Model for Active Galactic Nuclei: VLT/FORS2 Spectropolarimetry of Seyfert 2 galaxies
Cristina Ramos Almeida, M. J. Martínez Gonzalez, A. Asensio Ramos +5
The origin of the unification model for Active Galactic Nuclei (AGN) was the detection of broad hydrogen recombination lines in the optical polarized spectrum of the Seyfert 2 gala…
On the magnetism and dynamics of prominence legs hosting tornadoes
M. J. Martinez Gonzalez, A. Asensio Ramos, I. Arregui +3
Solar tornadoes are dark vertical filamentary structures observed in the extreme ultraviolet associated with prominence legs and filament barbs. Their true nature and relationship…
Spectro-polarimetric Imaging Reveals Helical Magnetic Fields in Solar Prominence Feet
M. J. Martinez Gonzalez, R. Manso Sainz, A. Asensio Ramos +3
Solar prominences are clouds of cool plasma levitating above the solar surface and insulated from the million-degree corona by magnetic fields. They form in regions of complex magn…
Constraining the shaping mechanism of the Red Rectangle through spectro-polarimetry of its central star
M. J. Martinez Gonzalez, A. Asensio Ramos, R. Manso Sainz +2
We carried out high-sensitivity spectropolarimetric observations of the central star of the Red Rectangle proto-planetary nebula with the aim of constraining the mechanism that giv…
Hierarchical analysis of the quiet Sun magnetism
A. Asensio Ramos, M. J. Martínez González
Standard statistical analysis of the magnetic properties of the quiet Sun rely on simple histograms of quantities inferred from maximum-likelihood estimations. Because of the inher…
Upper limits to the magnetic field in central stars of planetary nebulae
A. Asensio Ramos, M. J. Martinez Gonzalez, R. Manso Sainz +2
More than about twenty central stars of planetary nebulae (CSPN) have been observed spectropolarimetrically, yet no clear, unambiguous signal of the presence of a magnetic field in…
A search for magnetic fields on central stars in planetary nebulae
F. Leone, R. L. M. Corradi, M. J. Martínez González +2
One of the possible mechanisms responsible for the panoply of shapes in planetary nebulae is the presence of magnetic fields that drive the ejection of ionized material during the…
Hanle effect for stellar dipoles and quadrupoles
R. Manso Sainz, M. J. Martínez González
We derive exact expressions for the degree of lineal polarization over a resolved or integrated stellar disc due to resonance scattering and the Hanle effect from a dipolar or quad…
Anomalous circular polarization profiles in the He I 1083.0 nm multiplet from solar spicules
M. J. Martínez González, A. Asensio Ramos, R. Manso Sainz +2
We report Stokes vector observations of solar spicules and a prominence in the He I 1083 nm multiplet carried out with the Tenerife Infrared Polarimeter. The observations show line…
Resolving the internal magnetic structure of the solar network
M. J. Martínez González, L. R. Bellot Rubio, S. K. Solanki +4
We analyze the spectral asymmetry of Stokes V (circularly polarized) profiles of an individual network patch in the quiet Sun observed by Sunrise/IMaX. At a spatial resolution of 0…
Dead calm areas in the very quiet Sun
M. J. Martínez González, R. Manso Sainz, A. Asensio Ramos +1
We analyze two regions of the quiet Sun (35.6 x 35.6 Mm^2) observed at high spatial resolution (~100 km) in polarized light by the IMaX spectropolarimeter onboard the Sunrise ballo…
Analytical calculation of Stokes profiles of rotating stellar magnetic dipole
M. J. Martínez González, A. Asensio Ramos
The observation of the polarization emerging from a rotating star at different phases opens up the possibility to map the magnetic field in the stellar surface thanks to the well-k…
Model selection for spectro-polarimetric inversions
A. Asensio Ramos, R. Manso Sainz, M. J. Martinez Gonzalez +3
Inferring magnetic and thermodynamic information from spectropolarimetric observations relies on the assumption of a parameterized model atmosphere whose parameters are tuned by co…
Influence of phase-diversity image reconstruction techniques on circular polarization asymmetries
A. Asensio Ramos, M. J. Martinez Gonzalez, E. Khomenko +1
Full Stokes filter-polarimeters are key instruments for investigating the rapid evolution of magnetic structures on the solar surface. To this end, the image quality is routinely i…
Analytical maximum likelihood estimation of stellar magnetic fields
M. J. Martínez González, R. Manso Sainz, A. Asensio Ramos +1
The polarised spectrum of stellar radiation encodes valuable information on the conditions of stellar atmospheres and the magnetic fields that permeate them. In this paper, we give…
Non-detection of magnetic fields in the central stars of the planetary nebulae NGC 1360 and LSS 1362
F. Leone, M. J. Martinez Gonzalez, R. L. M. Corradi +2
The presence of magnetic fields is an attractive hypothesis for shaping PNe. We report on observations of the central star of the two Planetary Nebulae NGC1360 and LSS1326. We perf…
Unnoticed magnetic field oscillations in the very quiet Sun revealed by Sunrise/IMaX
M. J. Martinez Gonzalez, A. Asensio Ramos, R. Manso Sainz +7
We present observational evidence for oscillations of magnetic flux density in the quiet areas of the Sun. The majority of magnetic fields on the solar surface have strengths of th…