Browsing Institutt for teoretisk astrofysikk by Author "Guevara Gomez, Juan Camilo"

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 ...
  • An overview of HMI off-disk flare observations 
    Fremstad, Dennis; Guevara Gomez, Juan Camilo; Hudson, H.; Martínez Oliveros, J. C. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Context. White-light continuum observations of solar flares often have coronal counterparts, including the classical ‘white-light prominence’ (WLP) phenomenon. Aims. Coronal emissions by flares, seen in the white-light ...
  • High-frequency oscillations in small chromospheric bright features observed with Atacama Large Millimetre/Submillimetre Array 
    Guevara Gomez, Juan Camilo; Jafarzadeh, Shahin; Wedemeyer, Sven; Szydlarski, Mikolaj Marcin; Stangalini, M.; Fleck, Bernhard; Keys, Peter H. (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    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. The observations, which were taken with ...
  • Observations of Thomson Scattering from a Loop-prominence System 
    Martínez Oliveros, Juan Carlos; Guevara Gomez, Juan Camilo; Saint-Hilaire, Pascal; Hudson, Hugh; Krucker, Säm (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    We describe observations of the white-light structures in the low corona following the X8.2 flare SOL 2017-09-10, as observed in full Stokes parameters by the Helioseismic and Magnetic Imager (HMI) of the Solar Dynamics ...
  • Propagation of transverse waves in the solar chromosphere probed at different heights with ALMA sub-bands 
    Guevara Gomez, Juan Camilo; Jafarzadeh, Shahin; Wedemeyer, Sven; Szydlarski, Mikolaj (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    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 single receiver band at one time presently. ...
  • Prospects and challenges of numerical modeling of the Sun at millimeter wavelengths 
    Wedemeyer, Sven; Fleishman, Gregory; de la Cruz Rodríguez, Jaime; Gunár, Stanislav; da Silva Santos, João M.; Antolin, Patrick; Guevara Gomez, Juan Camilo; Szydlarski, Mikolaj; Eklund, Henrik (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    The Atacama Large Millimeter/submillimeter Array (ALMA) offers new diagnostic possibilities that complement other commonly used diagnostics for the study of the Sun. In particular, ALMA’s ability to serve as an essentially ...
  • The Sun at millimeter wavelengths: I. Introduction to ALMA Band 3 observations 
    Wedemeyer, Sven; Szydlarski, Mikolaj Marcin; Jafarzadeh, Shahin; Eklund, Henrik; Guevara Gomez, Juan Camilo; Bastian, Tim; Fleck, Bernhard; de la Cruz Rodriguez, Jaime; Rodger, Andrew; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Context. The Atacama Large Millimeter/submillimeter Array (ALMA) started regular observations of the Sun in 2016, first offering receiver Band 3 at wavelengths near 3 mm (100 GHz) and Band 6 at wavelengths around 1.25 mm ...
  • The Solar ALMA Science Archive (SALSA): First release, SALAT, and FITS header standard 
    de Jorge Henriques, Vasco Manuel; Jafarzadeh, Shahin; Guevara Gomez, Juan Camilo; Eklund, Henrik; Wedemeyer, Sven; Szydlarski, Mikolaj; Haugan, Stein Vidar Hagfors; Mohan, Atul (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2022)
    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 respective data posed a challenge due to ...
  • The Sun at millimeter wavelengths: II. Small-scale dynamic events in ALMA Band 3 
    Eklund, Henrik; Wedemeyer, Sven; Szydlarski, Mikolaj Marcin; Jafarzadeh, Shahin; Guevara Gomez, Juan Camilo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Context. Solar observations with the Atacama Large Millimeter/sub-millimeter Array (ALMA) facilitate studies of the atmosphere of the Sun at chromospheric heights at high spatial and temporal resolution at millimeter ...
  • 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 ...