153 citations · 616 across the 47 of their papers we have counts for
35 papers · 1 filter
The umbrella effect: Magnetic canopy topology modulates spatially averaged chromospheric three-minute power
Shahin Jafarzadeh, David B. Jess, Marco Stangalini +11
Three-minute (5 mHz) oscillations are a prominent signature of wave propagation in the solar chromosphere, but their measured power can vary substantially between full-disc o…
Probing the Physics of the Solar Corona with High-Resolution Observations using SKA-Mid
Mark C. M. Cheung, John S. Morgan, Rohit Sharma +3
We examine the capability of the SKA-Mid telescope for probing solar coronal structure and evolution. Using radiative magnetohydrodynamics simulations of a solar flare, we synthesi…
Solar, Heliospheric and Ionospheric Physics: Pathfinders, Precursors and SKAO Perspective
Pietro Zucca, Rohit Sharma, Divya Oberoi +5
The Solar, Heliospheric and Ionospheric (SHI) Physics Science Working Group of the Square Kilometre Array Observatory (SKAO) addresses the full chain of plasma processes linking th…
Observing the Sun with the Atacama Large Aperture Submillimeter Telescope (AtLAST): Forecasting Full-disk Observations
Mats Kirkaune, Sven Wedemeyer, Joshiwa van Marrewijk +2
The Atacama Large Millimeter Array (ALMA) has revolutionised the field of solar millimetre astronomy with its high angular resolution and cadence. However, with a limited field of…
The Sun at millimeter wavelengths V. Magnetohydrodynamic waves in a fibrillar structure
Maryam Saberi, Shahin Jafarzadeh, Sven Wedemeyer +4
Magnetohydrodynamic (MHD) waves, playing a crucial role in transporting energy through the solar atmosphere, manifest in various chromospheric structures. Here, we investigated MHD…
ALMA Memo 628 -- High-cadence observations of the Sun
Sven Wedemeyer, Mikolaj Szydlarski, M. Carmen Toribio +7
The Atacama Large Millimeter/submillimeter Array (ALMA) offers new diagnostic capabilities for studying the Sun, providing complementary insights through high spatial and temporal…
Atacama Large Aperture Submillimeter Telescope (AtLAST) Science: Solar and stellar observations
Sven Wedemeyer, Miroslav Barta, Roman Brajsa +35
Observations at (sub-)millimeter wavelengths offer a complementary perspective on our Sun and other stars, offering significant insights into both the thermal and magnetic composit…
The Sun at millimeter wavelengths IV. Magnetohydrodynamic waves in small-scale bright features
Juan Camilo Guevara Gómez, Shahin Jafarzadeh, Sven Wedemeyer +3
We used solar observations of a plage/enhanced network with the Atacama Large Millimeter/sub-millimeter Array (ALMA) in Band 3 and Band 6 together with synthetic continuum maps fro…
Utilizing the slope of the brightness temperature continuum as a diagnostic tool of solar ALMA observations
Henrik Eklund, Mikolaj Szydlarski, Sven Wedemeyer
The intensity of radiation at millimeter wavelengths from the solar atmosphere is closely related to the plasma temperature and the height of formation of the radiation is waveleng…
Prospects and challenges of numerical modelling of the Sun at millimetre wavelengths
Sven Wedemeyer, Gregory Fleishman, Jaime de la Cruz Rodriguez +6
The Atacama Large Millimeter/submillimeter Array (ALMA) offers new diagnostic possibilities that complement other commonly used diagnostics for the study of our Sun. In particular,…
Propagation of transverse waves in the solar chromosphere probed at different heights with ALMA sub-bands
Juan Camilo Guevara Gómez, Shahin Jafarzadeh, Sven Wedemeyer +1
The Atacama Large Millimeter/sub-millimeter Array (ALMA) has provided us with an excellent diagnostic tool for studies of the dynamics of the Solar chromosphere, albeit through a s…
A Genetic Algorithm to model Solar Radio Active Regions from 3D Magnetic Field Extrapolations
Alexandre José de Oliveira e Silva, Caius L. Selhorst, Joaquim E. R. Costa +6
In recent decades our understanding of solar active regions (ARs) has improved substantially due to observations made with better angular resolution and wider spectral coverage. Wh…
Power distribution of oscillations in the atmosphere of a plage region: Joint observations with ALMA, IRIS and SDO
Nancy Narang, Kalugodu Chandrashekhar, Shahin Jafarzadeh +3
We present a statistical analysis of power distribution of oscillations in a plage region in active region NOAA AR12651, observed jointly with ALMA (Atacama Large Millimeter/Submil…
The Sun at millimeter wavelengths. III. Impact of the spatial resolution on solar ALMA observations
Henrik Eklund, Sven Wedemeyer, Mikołaj Szydlarski +1
Interferometric observations of the Sun with ALMA provide valuable diagnostic tools for studying the small-scale dynamics of the solar atmosphere. Estimations of the observability…
The Solar ALMA Science Archive (SALSA)
Vasco M. J. Henriques, Shahin Jafarzadeh, Juan Camilo Guevara Gómez +5
In December 2016, the Atacama Large Millimeter/submillimeter Array (ALMA) carried out the first regular observations of the Sun. These early observations and the reduction of the r…
ALMA and IRIS Observations of the Solar Chromosphere II: Structure and Dynamics of Chromospheric Plage
Georgios Chintzoglou, Bart De Pontieu, Juan Martínez-Sykora +7
We propose and employ a novel empirical method for determining chromospheric plage regions, which seems to better isolate plage from its surrounding regions compared to other metho…
An overall view of temperature oscillations in the solar chromosphere with ALMA
Shahin Jafarzadeh, Sven Wedemeyer, Bernhard Fleck +12
By direct measurements of the gas temperature, the Atacama Large Millimeter/sub-millimeter Array (ALMA) has yielded a new diagnostic tool to study the solar chromosphere. Here we p…
The Sun at millimeter wavelengths -- II. Small-scale dynamic events in ALMA Band 3
Henrik Eklund, Sven Wedemeyer, Mikolaj Szydlarski +2
Solar observations with the Atacama Large Millimeter/sub-millimeter Array (ALMA) facilitate studying the atmosphere of the Sun at chromospheric heights at high spatial and temporal…
High-frequency oscillations in small chromospheric bright features observed with ALMA
Juan Camilo Guevara Gómez, Shahin Jafarzadeh, Sven Wedemeyer +4
We report detection of oscillations in brightness temperature, size, and horizontal velocity of three small bright features in the chromosphere of a plage/enhanced-network region.…
ALMA and IRIS Observations of the Solar Chromosphere I: an On-Disk Type II Spicule
Georgios Chintzoglou, Bart De Pontieu, Juan Martínez-Sykora +7
We present observations of the solar chromosphere obtained simultaneously with the Atacama Large Millimeter/submillimeter Array (ALMA) and the Interface Region Imaging Spectrograph…
The Sun at millimeter wavelengths I. Introduction to ALMA Band 3 observations
Sven Wedemeyer, Mikolaj Szydlarski, Shahin Jafarzadeh +7
We present an initial study of one of the first ALMA Band 3 observations of the Sun with the aim to characterise the diagnostic potential of brightness temperatures measured with A…
The multi-thermal chromosphere: inversions of ALMA and IRIS data
J. M. da Silva Santos, J. de la Cruz Rodríguez, J. Leenaarts +4
Numerical simulations of the solar chromosphere predict a diverse thermal structure with both hot and cool regions. Observations of plage regions in particular feature broader and…
First Spectral Analysis of a Solar Plasma Eruption Using ALMA
Andrew S. Rodger, Nicolas Labrosse, Sven Wedemeyer +3
The aim of this study is to demonstrate how the logarithmic millimeter continuum gradient observed using the Atacama Large Millimeter/submillimeter Array (ALMA) may be used to esti…
The solar chromosphere at millimetre and ultraviolet wavelengths. I. Radiation temperatures and a detailed comparison
Shahin Jafarzadeh, Sven Wedemeyer, Mikolaj Szydlarski +3
Solar observations with the Atacama Large Millimeter/submillimeter Array (ALMA) provide us with direct measurements of the brightness temperature in the solar chromosphere. We stud…