82 citations · 305 across the 13 of their papers we have counts for
13 papers
Diagnosing the solar atmosphere through the Mg I b 5173 Å line. II. Morphological classification of the intensity and circular polarization profiles
A. L. Siu-Tapia, L. R. Bellot Rubio, D. Orozco Suárez +1
The Mg I b line at 5173 Å is primarily magnetically sensitive to heights between the mid photosphere and the low chromosphere, a region that has not been sufficiently explored…
The Automatic Identification and Tracking of Coronal Flux Ropes -- Part II: New Mathematical Morphology-based Flux Rope Extraction Method and Deflection Analysis
Andreas Wagner, Slava Bourgeois, Emilia K. J. Kilpua +9
We present a magnetic flux rope (FR) extraction tool for solar coronal magnetic field modelling data, which builds upon the methodology from Wagner et al. (2023). We apply the sche…
Analysis of full-disc H alpha observations: Carrington maps and filament properties in 1909-2022
Theodosios Chatzistergos, Ilaria Ermolli, Dipankar Banerjee +14
Full disc observations of the Sun in the H line provide information about the solar chromosphere and in particular about the filaments, which are dark and elongated features tha…
Total electron content PCA-NN model for middle latitudes
Anna Morozova, Teresa Barata, Tatiana Barlyaeva +1
A regression-based model was previously developed to forecast the total electron content (TEC) at middle latitudes. We present a more sophisticated model using neural networks (NN)…
Exploring magnetic loops and serpentine fields in the quiet Sun with the GRIS-IFU
Ryan James Campbell, Ricardo Gafeira, Mihalis Mathioudakis +2
Synthetic observations produced from radiative magnetohydronamic simulations have predicted that higher polarization fractions in the quiet solar photosphere would be revealed by i…
Diagnostic capabilities of spectropolarimetric observations for understanding solar phenomena I. Zeeman-sensitive photospheric lines
C. Quintero Noda, P. S. Barklem, R. Gafeira +7
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 the n…
3D solar coronal loop reconstructions with machine learning
Iulia Chifu, Ricardo Gafeira
The magnetic field plays an essential role in the initiation and evolution of different solar phenomena in the corona. The structure and evolution of the 3D coronal magnetic field…
Temporal evolution of short-lived penumbral microjets
A. Siu-Tapia, L. R. Bellot Rubio, D. Orozco Suárez +1
Context. Penumbral microjets are elongated jet-like brightenings observed in the chromosphere above sunspot penumbrae. They are transient events that last from a few seconds to sev…
Analysis of full disc Ca II K spectroheliograms III. Plage area composite series covering 1892-2019
Theodosios Chatzistergos, Ilaria Ermolli, Natalie A. Krivova +16
We derive the plage area evolution over the last 12 solar cycles employing data from all Ca II K archives available publicly in digital form known to us, including several as yet u…
Oscillations on width and intensity of slender Ca II H fibrils from Sunrise/SuFI
R. Gafeira, S. Jafarzadeh, S. K. Solanki +12
We report the detection of oscillations in slender Ca II H fibrils (SCFs) from high-resolution observations acquired with the Sunrise balloon-borne solar observatory. The SCFs show…
Morphological properties of slender Ca II H fibrils observed by SUNRISE II
R. Gafeira, A. Lagg, Sami K Solanki +12
We use seeing-free high spatial resolution Ca II H data obtained by the SUNRISE observatory to determine properties of slender fibrils in the lower solar chromosphere. In this work…
Transverse Oscillations in Slender Ca II H Fibrils Observed with Sunrise/SuFI
Shahin Jafarzadeh, S. K. Solanki, R. Gafeira +11
We present observations of transverse oscillations in slender Ca II H fibrils (SCFs) in the lower solar chromosphere. We use a 1 hr long time series of high- (spatial and temporal-…
The Bimodal Colors of Centaurs and Small Kuiper Belt Objects
Nuno Peixinho, Audrey Delsanti, Aurélie Guilbert-Lepoutre +2
Ever since the very first photometric studies of Centaurs and Kuiper Belt Objects (KBOs) their visible color distribution has been controversial. That controversy gave rise to a pr…