Poster Presentation Astronomical Society of Australia Annual Scientific Meeting including HWWS 2013

Properties of coronal rains in the Sun (#253)

Robert Nilsson 1 2 , Alina C Donea 2
  1. Lulea University of Technology, Lulea, Sweden
  2. School of Mathematical Sciences, Monash University, Clayton, VIC, Australia

Sometimes, eruptions in the Sun are accompanied  by  coronal rains. Coronal rain corresponds to cool and dense blob-like material forming in the hot solar coronal environment in timescales of minutes, which subsequently falls down to the surface along loop-like paths.    This phenomenon is often observed in chromospheric lines such as Halpha, but can also be observed with the Atmospheric Imaging Assembly (AIA) instrument of the satellite Solar Dynamics Observatory.  In this work, we will present spectacular images of coronal rains at various AIA frequencies, and will discuss  the complex dynamics of these events at small and large spatial and temporal scales, observed at photospheric, chromospheric and coronal heights.  High resolution observations also reveal  that prominences are often composed of a myriad of fine threads, outlining a fine-scale structure of the magnetic field and the presence of flows along the threads.  Coronal rain is gaining attention from the solar physics community thanks to recently discovered properties such as its deep link to coronal heating and its apparently ubiquitous character in active regions, which will also be discussed here.