Physics
Scientific paper
Dec 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986nascp2442..149h&link_type=abstract
In NASA. Goddard Space Flight Center Coronal and Prominence Plasmas p 149-153 (SEE N87-20871 13-92)
Physics
13
Electron Energy, Solar Corona, Solar Physics, Solar Prominences, Sun, Thickness, Balmer Series, Coronagraphs, Hydrogen, Stark Effect
Scientific paper
The electron density was determined for a number of quiescent prominences at various positions from the Stark effect. It was found that the intensity ratio of Mg I emission lines to SrII lines is independent of the observed electron density in the range of ten to the 10.2 power to 10 to the 11.4 power cm-3. This contrasts with Landman's (1984) theoretical expectation that the ratio is proportional to the electron density. From the intensity of Balmer lines and the electron density, it is inferred that the true diameter of a thread in prominence of high electron density may be smaller than 0.2". The averaged total number density of hydrogen NH sub of was found to be 3-6 times 10 to the 11th power cm-3, leading to a total gas pressure P =0.6 dyn cm-2 and a total density of approx. 10 to the minus twelth power g cm-3. Landman's large value of NH approx. 6 times 10 to the 12th power and Pg approx. 6 may have resulted either from the fact that he has treated very bright prominences and/or from the derivation of the high electron density for all prominences he studied.
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