Browsing Institutt for teoretisk astrofysikk by Author "Guerreiro, Nuno Miguel Rodrigues"

Now showing items 1-5 of 5

  • THE CYCLING OF MATERIAL BETWEEN THE SOLAR CORONA AND CHROMOSPHERE 
    Guerreiro, Nuno Miguel Rodrigues; Hansteen, Viggo; De Pontieu, Bart (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    Observations of transition region emission lines reveal the presence of redshifts in lines formed from the top of the chromosphere up to temperatures of about 2.5 × 105 K and blueshifts for temperatures above that. However, ...
  • NUMERICAL SIMULATIONS of CORONAL HEATING THROUGH FOOTPOINT BRAIDING 
    Hansteen, Viggo; Guerreiro, Nuno Miguel Rodrigues; De Pontieu, Bart Walter; Carlsson, Mats (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Advanced three-dimensional (3D) radiative MHD simulations now reproduce many properties of the outer solar atmosphere. When including a domain from the convection zone into the corona, a hot chromosphere and corona are ...
  • NUMERICAL SIMULATIONS OF SPICULE ACCELERATION 
    Guerreiro, Nuno Miguel Rodrigues; Carlsson, Mats; Hansteen, Viggo (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2013)
    Observations in the Hα line of hydrogen and the H and K lines of singly ionized calcium on the solar limb reveal the existence of structures with jet-like behavior, usually designated as spicules. The driving mechanism for ...
  • Small-scale Heating Events in the Solar Atmosphere. I. Identification, Selection, and Implications for Coronal Heating 
    Guerreiro, Nuno Miguel Rodrigues; Haberreiter, M.; Hansteen, Viggo; Schmutz, W (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    We present a comprehensive method to analyze small-scale heating events in detail in a 3D magnetohydrodynamics simulation for quiet-Sun conditions. The method determines the number, volume, and some general geometric ...
  • Small-scale heating events in the solar atmosphere: II. Lifetime, total energy, and magnetic properties 
    Guerreiro, Nuno Miguel Rodrigues; Haberreiter, M.; Hansteen, Viggo; Schmutz, W. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2017)
    Context. Small-scale heating events (SSHEs) are believed to play a fundamental role in understanding the process responsible for heating of the solar corona, the pervading redshifts in the transition region, and the ...