TY  - BOOK
AU  - Pietarila,Anna
ED  - National Center for Atmospheric Research (U.S.).
TI  - He I 584 Å line in the solar spectrum
PY  - 2002///
CY  - Boulder, CO
PB  - National Center for Atmospheric Research (NCAR)
KW  - National Center for Atmospheric Research (NCAR)
KW  - Solar atmosphere
KW  - Research
KW  - Mathematical models
KW  - Spectrum, Solar
N1  - "30 August 2002"--Cover; Thesis (M.S.)--Lund University, 2002; Includes bibliographical references (p. [107-109]) and abstract
N2  - 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
ER  -