58 citations · 535 across the 35 of their papers we have counts for
36 papers
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…
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…
Implementation of thermal conduction energy transfer models in the Bifrost Solar atmosphere MHD code
George Cherry, Boris Gudiksen, Mikolaj Szydlarski
Context: Thermal conductivity provides important contributions to the energy evolution of the upper solar atmosphere, behaving as a non-linear concentration-dependent diffusion equ…
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…
Can we rely on EUV emission to identify coronal waveguides?
P. Kohutova, P. Antolin, M. Szydlarski +1
Traditional models of coronal oscillations rely on modelling the coronal structures that support them as compact cylindrical waveguides. Recently, an alternative model of the struc…
Damping of coronal oscillations in self-consistent 3D radiative MHD simulations of the solar atmosphere
P. Kohutova, P. Antolin, M. Szydlarski +1
Oscillations are abundant in the solar corona. Coronal loop oscillations are typically studied using highly idealised models of magnetic flux tubes. In order to improve our underst…
Comparison of chromospheric diagnostics in a 3D model atmosphere: H linewidth and mm continua
Sneha Pandit, Sven Wedemeyer, Mats Carlsson +1
The Ha line, one of the most studied chromospheric diagnostics, is a tracer for magnetic field structures, while its line core intensity provides an estimate of the mass density. T…
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…
Global MHD simulations of the solar convective zone using a volleyball mesh decomposition. I. Pilot
Andrius Popovas, Åke Nordlund, Mikolaj Szydlarski
Solar modelling has long been split into ''internal'' and ''surface'' modelling, because of the lack of tools to connect the very different scales in space and time, as well as the…
The impact of multi-fluid effects in the solar chromosphere on the ponderomotive force under LTE and NEQ ionization conditions
Juan Martínez-Sykora, Bart De Pontieu, Viggo H. Hansteen +3
The ponderomotive force is suggested to be the main mechanism to produce the so-called first ionization potential (FIP) effect - the enrichment of low FIP elements observed in the…
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…
Stirring the Base of the Solar Wind: On Heat Transfer and Vortex Formation
Adam J. Finley, Sacha A. Brun, Mats Carlsson +3
Current models of the solar wind must approximate (or ignore) the small-scale dynamics within the solar atmosphere, however these are likely important in shaping the emerging wave-…
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 formation and heating of chromospheric fibrils in a radiation-MHD simulation
M. K. Druett, J. Leenaarts, M. Carlsson +1
Aims: We examine the movements of mass elements within dense fibrils using passive tracer particles (corks) in order to understand fibril creation and destruction processes. Method…
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.…
On the velocity drift between ions in the solar atmosphere
Juan Martínez-Sykora, Mikolaj Szydlarski, Viggo H. Hansteen +1
The solar atmosphere is composed of many species which are populated at different ionization and excitation levels. The upper chromosphere, transition region, and corona are nearly…
Self-consistent 3D radiative MHD simulations of coronal rain formation and evolution
P. Kohutova, P. Antolin, A. Popovas +2
Coronal rain consists of cool and dense plasma condensations formed in coronal loops as a result of thermal instability. Previous numerical simulations of thermal instability and c…