Browsing Institutt for teoretisk astrofysikk by Author "Grant, Samuel D. T."

Now showing items 1-10 of 10

  • An overall view of temperature oscillations in the solar chromosphere with ALMA 
    Jafarzadeh, Shahin; Wedemeyer, Sven; Fleck, Bernhard; Stangalini, M.; Jess, D. B.; Morton, R. J.; Szydlarski, Mikolaj Marcin; de Jorge Henriques, Vasco Manuel; Zhu, X.; Wiegelmann, T.; Guevara Gomez, Juan Camilo; Grant, Samuel D. T.; Chen, B.; Reardon, K.; White, S. M. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    By direct measurements of the gas temperature, the Atacama Large Millimeter/submillimeter Array (ALMA) has yielded a new diagnostic tool to study the solar chromosphere. Here, we present an overview of the brightness-temperature ...
  • Characterization of shock wave signatures at millimetre wavelengths from Bifrost simulations 
    Eklund, Henrik; Wedemeyer, Sven; Snow, Ben; Jess, David B.; Jafarzadeh, Shahin; Grant, Samuel D. T.; Carlsson, Mats; Szydlarski, Mikolaj Marcin (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Observations at millimetre wavelengths provide a valuable tool to study the small-scale dynamics in the solar chromosphere. We evaluate the physical conditions of the atmosphere in the presence of a propagating shock wave ...
  • A chromospheric resonance cavity in a sunspot mapped with seismology 
    Jess, David B.; Snow, Ben; Houston, Scott J.; Bortha, Gert J. J.; Fleck, Bernhard; Prasad, S. Krishna; Asensio Ramos, Andres; Morton, Richard J.; Keys, Peter H.; Jafarzadeh, Shahin; Stangalini, Marco; Grant, Samuel D. T.; Christian, Damian J. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Sunspots are intense collections of magnetic fields that pierce through the Sun’s photosphere, with their signatures extending upwards into the outermost extremities of the solar corona1. Cutting-edge observations and ...
  • Investigating the origin of magnetic perturbations associated with the FIP Effect 
    Murabito, Mariarita; Stangalini, Marco; Baker, Deborah; Valori, Gherardo; Jess, D.B.; Jafarzadeh, Shahin; Brooks, D.H.; Ermolli, I.; Giorgi, F.; Grant, Samuel D. T.; Long, D.M.; van Driel-Gesztelyi, Lidia (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    Recently, magnetic oscillations were detected in the chromosphere of a large sunspot and found to be linked to the coronal locations where a first ionization potential (FIP) effect was observed. In an attempt to shed light ...
  • Magnetoacoustic wave energy dissipation in the atmosphere of solar pores 
    Gilchrist-Millar, Caitlin A.; Jess, David B.; Grant, Samuel D. T.; Keys, Peter H.; Beck, Christian; Jafarzadeh, Shahin; Riedl, Julia M.; Van Doorsselaere, Tom; Ruiz Cobo, Basilio (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    The suitability of solar pores as magnetic wave guides has been a key topic of discussion in recent years. Here, we present observational evidence of propagating magnetohydrodynamic wave activity in a group of five ...
  • Magnetohydrodynamic Nonlinearities in Sunspot Atmospheres: Chromospheric Detections of Intermediate Shocks 
    Houston, Scott J.; Jess, David B.; Keppens, Rony; Stangalini, Marco; Keys, Peter H.; Grant, Samuel D. T.; Jafarzadeh, Shahin; McFetridge, L. M.; Murabito, Mariarita; Ermolli, I.; Giorgi, F. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
  • The Fibre Resolved OpticAl and Near-Ultraviolet Czerny–Turner Imaging Spectropolarimeter (FRANCIS) 
    Jess, David B.; Grant, Samuel D. T.; Bate, William; Liu, Jiajia; Jafarzadeh, Shahin; Keys, Peter H.; Vieira, Luís E. A.; Dal Lago, Alisson; Guarnieri, Fernando L.; Christian, Damian J.; Gilliam, Doug; Banerjee, Dipankar (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
  • The Propagation of Coherent Waves Across Multiple Solar Magnetic Pores 
    Grant, Samuel D. T.; Jess, D.B.; Stangalini, M.; Jafarzadeh, Shahin; Fedun, V.; Verth, G.; Keys, P.H.; Rajaguru, S.P.; Uitenbroek, Han; Macbride, C.D.; Bate, W.; Gilchrist-Millar, C.A. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    Abstract Solar pores are efficient magnetic conduits for propagating magnetohydrodynamic wave energy into the outer regions of the solar atmosphere. Pore observations often contain isolated and/or unconnected ...
  • The Sun at millimeter wavelengths: IV. Magnetohydrodynamic waves in small-scale bright features 
    Guevara Gomez, Juan Camilo; Jafarzadeh, Shahin; Wedemeyer, Sven; Grant, Samuel D. T.; Eklund, Henrik; Szydlarski, Mikolaj (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Aims. 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 from numerical simulations with Bifrost ...
  • Waves in the lower solar atmosphere: the dawn of next-generation solar telescopes 
    Jess, David B.; Jafarzadeh, Shahin; Keys, Peter H.; Stangalini, Marco; Verth, Gary; Grant, Samuel D. T. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Waves and oscillations have been observed in the Sun’s atmosphere for over half a century. While such phenomena have readily been observed across the entire electromagnetic spectrum, spanning radio to gamma-ray sources, ...