Resonant Scattering of Emission Lines in Coronal Loops: Effects on Image Morphology and Line Ratios

Kenneth Wood, JC Raymond

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)

Abstract

We have investigated the effects of resonant scattering of emission lines on the image morphology and intensity from coronal loop structures. It has previously been shown that line-of-sight effects in optically thin line emission can yield loop images that appear uniformly bright at one viewing angle but show "looptop sources" at other viewing angles. For optically thick loops where multiple resonant scattering is important, we use a three-dimensional Monte Carlo radiation transfer code. Our simulations show that the intensity variation across the image is more uniform than the optically thin simulation, and depending on viewing angle the intensity may be lower or higher than that predicted from optically thin simulations due to scattering out of or into the line of sight.

Original languageEnglish
Pages (from-to)563
Number of pages563
JournalAstrophysical Journal
Volume540
Publication statusPublished - 1 Sept 2000

Keywords

  • line : formation
  • radiative transfer
  • scattering
  • Sun : corona
  • Sun : X-rays, gamma rays
  • X-RAY-LINES
  • FE-XVII
  • SOLAR CORONA
  • POLARIZATION
  • IONIZATION
  • SPECTRUM
  • OPACITY
  • PLASMAS

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