Unravelling the Components of a Multi-Thermal Coronal Loop Using Magnetohydrodynamic Seismology

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      Coronal loops, constituting the basic building blocks of the active Sun, serve as primary targets to help understand the mechanisms responsible for maintaining multi-million Kelvin temperatures in the solar and stellar coronae. Despite significant advances in observations and theory, our knowledge on the fundamental properties of these structures is limited. Here, we present unprecedented observations of accelerating slow magnetoacoustic waves along a coronal loop that show differential propagation speeds in two distinct temperature channels, revealing the multi-stranded and multi-thermal nature of the loop. Utilizing the observed speeds and employing nonlinear force-free magnetic field extrapolations, we derive the actual temperature variation along the loop in both channels, and thus are able to resolve two individual components of the multi-thermal loop for the first time. The obtained positive temperature gradients indicate uniform heating along the loop,rather than isolated footpoint heating.

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      DOI

      Original languageEnglish
      Article number103
      JournalThe Astrophysical Journal
      Journal publication date05 Jan 2017
      Issue number2
      Volume834
      DOIs
      StatePublished - 05 Jan 2017

        Research areas

      • Astrophysics - Solar and Stellar Astrophysics

      ID: 122453614