47 citations · 458 across the 21 of their papers we have counts for
21 papers
Inference of horizontal velocity fields from the induction equation in the solar atmosphere. I. Analytical and numerical solutions in 2D
H. Vila Crespo, J. M. Borrero, I. Milić +2
Spectroscopic and spectropolarimetric observations, which rely on the Doppler effect, only provide access to the line-of-sight component of the solar plasma velocity (vz). However,…
SiO maser polarization and magnetic field in evolved cool stars
L. Marinho, F. Herpin, H. Wiesemeyer +6
Both magnetic fields and photospheric/atmospheric dynamics can be involved in triggering the important mass loss observed in evolved cool stars. Previous works have revealed that t…
High-resolution spectroscopy of Boyajian's star during optical dimming events
M. J. Martínez González, C. González-Fernández, A. Asensio Ramos +13
Boyajian's star is an apparently normal main sequence F-type star with a very unusual light curve. The dipping activity of the star, discovered during the Kepler mission, presents…
The Magnetic Response of the Solar Atmosphere to Umbral Flashes
S. J. Houston, D. B. Jess, A. Asensio Ramos +4
Chromospheric observations of sunspot umbrae offer an exceptional view of magneto-acoustic shock phenomena and the impact they have on the surrounding magnetically-dominated plasma…
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…
Model comparison for the density structure across solar coronal waveguides
I. Arregui, R. Soler, A. Asensio Ramos
The spatial variation of physical quantities, such as the mass density, across solar atmospheric waveguides governs the timescales and spatial scales for wave damping and energy di…
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…
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…
On the inversion of the scattering polarization and the Hanle effect signals in the hydrogen Lyman- line
R. Ishikawa, A. Asensio Ramos, L. Belluzzi +5
Magnetic field measurements in the upper chromosphere and above, where the gas-to-magnetic pressure ratio is lower than unity, are essential for understanding the thermal struc…
Time evolution of plasma parameters during the rise of a prominence instability
D. Orozco Suárez, J. A. Díaz, A. Asensio Ramos +1
We present high spatial resolution spectropolarimetric observations of a quiescent hedgerow prominence taken in the He I 1083.0 nm triplet. The observation consisted of a time seri…
Infrared extinction in the Inner Milky Way through the red clump giants
Carlos González-Fernández, Andrés Asensio Ramos, Francisco Garzón +2
While the shape of the extinction curve on the infrared is considered to be set and the extinction ratios between infrared bands are usually taken to be approximately constant, a r…
Improved search of PCA databases for spectro-polarimetric inversion
R. Casini, A. Asensio Ramos, B. W. Lites +1
We describe a simple technique for the acceleration of spectro-polarimetric inversions based on principal component analysis (PCA) of Stokes profiles. This technique involves the i…
Determination of Transverse Density Structuring from Propagating MHD Waves in the Solar Atmosphere
I. Arregui, A. Asensio Ramos, D. J. Pascoe
We present a Bayesian seismology inversion technique for propagating magnetohydrodynamic (MHD) transverse waves observed in coronal waveguides. The technique uses theoretical predi…
Coronal loop physical parameters from the analysis of multiple observed transverse oscillations
A. Asensio Ramos, I. Arregui
The analysis of quickly damped transverse oscillations of solar coronal loops using magneto-hydrodynamic seismology allow us to infer physical parameters that are difficult to meas…
Bayesian Analysis of Multiple Harmonic Oscillations in the Solar Corona
I. Arregui, A. Asensio Ramos, A. J. Diaz
The detection of multiple mode harmonic kink oscillations in coronal loops enables to obtain information on coronal density stratification and magnetic field expansion using seismo…
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…
Scattering polarization in the CaII Infrared Triplet with Velocity Gradients
E. S. Carlin, R. Manso Sainz, A. Asensio Ramos +1
Magnetic field topology, thermal structure and plasma motions are the three main factors affecting the polarization signals used to understand our star. In this theoretical investi…
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…
Bayesian Magnetohydrodynamic Seismology of Coronal Loops
Inigo Arregui, Andres Asensio Ramos
We perform a Bayesian parameter inference in the context of resonantly damped transverse coronal loop oscillations. The forward problem is solved in terms of parametric results for…
Bayesian inference of solar and stellar magnetic fields in the weak-field approximation
A. Asensio Ramos
The weak-field approximation is one of the simplest models that allows us to relate the observed polarization induced by the Zeeman effect with the magnetic field vector present on…
The intrinsic dimensionality of spectro-polarimetric data
A. Asensio Ramos, H. Socas-Navarro, A. Lopez Ariste +1
The amount of information available in spectro-polarimetric data is estimated. To this end, the intrinsic dimensionality of the data is inferred with the aid of a recently derived…