He I 584 A Line in the Solar Spectrum

Details He I 584 A Line in the Solar Spectrum He I 584 A Line in the Solar Spectrum

Jan 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002phdt.........2p&link_type=abstract

Thesis, PB2003-100560; NCAR/CR-174

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Helium, Helium Isotopes, Neutral Gases, Extreme Ultraviolet Radiation, Solar Atmosphere, Theses, Time Series Analysis, Inelastic Scattering, Solar Radiation, Time Dependence

Scientific paper

This thesis tries to look into the formation of the neutral helium resonance line in the solar EUV spectrum. A time dependent approach is taken when dealing with the helium emission. In the beginning, the idea was to analyze some observations and put helium into context with other lines. In the end, it proved to be a difficult task, and the scope of this thesis broadened. First a brief review of the Sun and its atmosphere is given in chapter 1. The existing observational facts and models for the helium line formation will are discussed in chapters 2 and 3. Chapter 4 focuses on time series observations done with the SUMER instrument. In chapter 5 two of the models for helium line formation reviewed earlier are explored. Finally, chapter 6 draws conclusions from the observations and calculations.

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