Browsing Institutt for teoretisk astrofysikk by Author "Heinzel, Petr"

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  • On the importance of Ca II photoionization by the hydrogen lyman transitions in solar flare models 
    Osborne, Christopher M. J.; Heinzel, Petr; Kašparová, Jana; Fletcher, Lyndsay (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2021)
    ABSTRACT The forward fitting of solar flare observations with radiation–hydrodynamic simulations is a common technique for learning about energy deposition and atmospheric evolution during these explosive events. ...
  • Solar Ultraviolet Bursts 
    Young, Peter R.; Tian, Hui; Peter, Hardi; Rutten, Robert; Nelson, Chris J.; Huang, Zhenghua; Schmieder, Brigitte; Vissers, Gregal Joan Maria; Toriumi, Shin; Rouppe van der Voort, Luc; Madjarska, Maria S.; Danilovic, Sanja; Berlicki, Arkadiusz; Chitta, Lakshmi Pradeep; Cheung, Mark C.M.; Madsen, Chad; Reardon, Kevin P.; Katsukawa, Yukio; Heinzel, Petr (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    The term “ultraviolet (UV) burst” is introduced to describe small, intense, transient brightenings in ultraviolet images of solar active regions. We inventorize their properties and provide a definition based on image ...
  • The F-CHROMA grid of 1D RADYN flare models 
    Carlsson, Mats; Fletcher, Lyndsay; Allred, Joel; Heinzel, Petr; Kašparová, Jana; Kowalski, Adam; Mathioudakis, Mihalis; Reid, Aaron; Simões, Paulo J. A. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2023)
    Context . Solar flares are the result of the sudden release of magnetic energy in the corona. Much of this energy goes into accelerating charged particles to high velocity. These particles travel along the magnetic field ...