Non-LTE Radiation Processes: Application to the Solar Corona

  • S. Collin
Conference paper
Part of the NATO Science Series book series (ASIC, volume 558)


These lectures are intended to present a simple but relatively complete description of the theory needed to understand the formation of lines in non-local thermodynamical equilibrium (NLTE), without appealing to any previous knowledge except a few basics of physics and spectroscopy. After recalling elementary notions of radiation transfer, the chapter is focussed on the computation of the level populations, the source function, the ionization state, and finally the line intensity. An application is made to forbidden coronal lines which were observed during eclipses since decades.


Transfer Equation Solar Corona Source Function Local Thermodynamical Equilibrium Planetary Nebula 
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Copyright information

© Springer Science+Business Media Dordrecht 2000

Authors and Affiliations

  • S. Collin
    • 1
  1. 1.Observatoire de ParisMeudonFrance

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