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Profiles and Wavelength of Spectrum Lines in the Solar Chromosphere


Parker, James Mervin (1954) Profiles and Wavelength of Spectrum Lines in the Solar Chromosphere. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/GC46-VM62.


NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. Observations have been made of the spectrum of the solar chromosphere outside of eclipse. The spectral region covered extends from [...] to [...] and from [...] to [...]. In addition, The O I triplet at [...] was photographed. In all, 1882 emission lines were photographed, and measured for wavelengths. Photographic intensity profiles were found for 530 of the lines, through the use of a microdensitometer. 330 of these lines were due to the Swan hands of C2. These lines were measured for total intensity, and a rotational temperature of 4600[degrees]K derived. The other 200 lines were reduced using the method of Voigt profiles. The width of the lines as a function of atomic weight was examined in the light of several assumptions, and it was found that the best interpretation was that of low temperature, of the order of 5000[degrees]K to 6000[degrees]K and an overlying turbulent motion which varies with height in the chromosphere. The interpretation of the line contours on this basis was performed using the model chromosphere due to van de Hulst.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Astronomy and Physics)
Degree Grantor:California Institute of Technology
Division:Physics, Mathematics and Astronomy
Major Option:Astronomy
Minor Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Nicholson, Seth B.
Group:Astronomy Department
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1954
Record Number:CaltechETD:etd-01122004-160233
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:136
Deposited By: Imported from ETD-db
Deposited On:12 Jan 2004
Last Modified:13 Jun 2023 21:50

Thesis Files

PDF (Parker_jm_1954.pdf) - Final Version
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