35 citations · 55 across the 14 of their papers we have counts for
14 papers
Forward modeling solar spectra onto Doppler images of λ And
Ö. Adebali, A. G. M. Pietrow
By using the Doppler images of λ And, we aim to investigate whether surface temperature information can be reversed to create its activity parameters, by feeding a toy model with s…
Thermal background reduction for mid-infrared imaging by low-rank background and sparse point-source modelling
R. A. R. Moens, A. G. M. Pietrow, B. Brandl +1
Mid-infrared astronomy from the ground faces critical challenges in accurately detecting and quantifying sources due to the dominant spatially and time-variable background noise. M…
Prominence signatures in the Fraunhofer G-band; Testing ionization memory with multi-line prominence diagnostics
A. G. M. Pietrow, H. Balthasar, P. Váradi Nagy +4
The Fraunhofer G-band around 4304 Å is widely used as a photospheric diagnostic and is generally not expected to show signatures of chromospheric or coronal structures. However, re…
Chromospheric and photospheric properties of sunspots as inferred from Stokes inversions under magneto-hydrostatic and non-local-thermodynamic equilibrium
A. Vicente Arevalo, J. M. Borrero, I. Milic +3
Sunspots are crucial for exploring how magnetic fields and plasma flows interact in the solar atmosphere, spanning from the stable photosphere to the shock-dominated chromosphere.…
Does the solar oxygen abundance change over the solar cycle? An investigation into activity-induced variations of the O I infrared triplet
A. G. M. Pietrow, M. Baratella, I. V. Ilyin +2
The determination of the solar oxygen abundance remains a central problem in astrophysics, as its accuracy is limited not only by models but also by systematics. While many of thes…
Understanding Solar Flares and Energetic Events: Open questions, observational requirements, and instrumental needs over the coming decade
Malcolm K. Druett, Graham S. Kerr, Joel C. Allred +15
Solar flares are the largest energy-release events in the Solar System, allowing us to study fundamental physical phenomena under extreme conditions. Those include magnetic reconne…
Why every solar eclipse viewing event needs a disco ball
Valerie A. Rapson, Alex Pietrow, Robert J. Cumming +12
Solar eclipses offer unparalleled opportunities for public engagement in astronomy. Large groups of people often gather to view eclipses, and these events require affordable and ea…
ATREIDES I. Embarking on a trek across the exo-Neptunian landscape with the TOI-421 system
V. Bourrier, M. Steiner, A. Castro-González +75
The distribution of close-in exoplanets is shaped by the interplay between atmospheric and dynamical processes. The Neptunian Desert, Ridge, and Savanna illustrate the sensitivity…
Solar Flux Atlases: The new HARPS-N Quiet Sun Benchmark and Ca II H & K Lines Continuum Normalisation
F. Hanassi-Savari, A. G. M. Pietrow, M. K. Druett +2
Context. Solar flux atlases observe the spatially integrated light from the Sun, treating it as a star. They are fundamental tools for gaining insight into the composition of the S…
An Atlas of Spectroheliograms from 3641 to 6600 Å
P. Váradi Nagy, A. G. M. Pietrow
We present a spectral atlas of solar spectroheliograms covering the wavelength range from 3641 to 6600 Å, with continuous coverage between 3711 and 5300 Å, and sparser coverage bey…
Stellar surface information from the Ca II H&K lines -- II. Defining better activity proxies
M. Cretignier, N. C. Hara, A. G. M. Pietrow +6
In our former paper I, we showed on the Sun that different active regions possess unique intensity profiles on the Ca II H & K lines. We now extend the analysis by showing how thos…
Spectral Characteristics of a Rotating Solar Prominence in Multiple Wavelengths
A. G. M. Pietrow, V. Liakh, C. M. J. Osborne +2
We present synthetic spectra corresponding to a 2.5D magnetohydrodynamical simulation of a rotating prominence in the Ca II 8542 Å, H, Ca II K, Mg II k, Ly , and Ly lines…
Towards a physical understanding of the thermal background in large ground-based telescopes
Leonard Burtscher, Ioannis Politopoulos, Sergio Fernández-Acosta +11
Ground-based thermal-infrared observations have a unique scientific potential, but are also extremely challenging due to the need to accurately subtract the high thermal background…
Inference of the chromospheric magnetic field configuration of solar plage using the Ca II 8542 Å line
A. G. M. Pietrow, D. Kiselman, J. de la Cruz Rodríguez +3
It has so far proven impossible to reproduce all aspects of the solar plage chromosphere in quasi-realistic numerical models. The magnetic field configuration in the lower atmosphe…