Physics
Scientific paper
Jan 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994phdt........23f&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF MARYLAND COLLEGE PARK, 1994.Source: Dissertation Abstracts International, Volume: 56-04, Section:
Physics
6
Scientific paper
Extreme-ultraviolet (EUV) emission above the quiet solar limb up to 1.2 solar radii was studied using observations made from two different flights of the Goddard Solar EUV Rocket Telescope and Spectrograph (SERTS) covering three different spatial locations. These observations measure the intensities from a number of EUV spectral lines as a function of height. The density scale height was determined from the radial dependence of the intensity of the spectral lines. Line-ratio densities and line-ratio temperatures were determined from ratios of the intensities of iron lines. The line-ratio temperature determined from the ionization balances of Arnaud and Rothenflug (1985) were more self-consistent than the line-ratio temperatures obtained from the values of Arnaud and Raymond (1992). Emission measures were determined from the Cr XIII, Si XI, Al X and iron lines. Limits on the filling factor were determined from the emission measure and the line-ratio densities for all three regions. The set of relative elemental abundance of silicon, aluminum, and chromium to iron was determined for a quiet coronal region observed by SERTS 1991. The results did not agree with those of Meyer 1985 or 1992, but instead showed aluminum enhancement while silicon was underabundant. For SERTS 1989 the relative elemental abundance of silicon to iron did agree with the Meyer elemental abundances. Heating constraints on the solar corona were determined. The line-ratio temperature increased with height up to at least 1.15 solar radii for all three cases studied. This requires some source of heating at or above that height in the corona. For two of the three cases studied the total radiative power was larger than the maximum heating by heat conduction from above over at least part of the observed region for any filling factor, and, in all three cases, for all filling factor less than or equal to 0.1, so local nonconductive heating is needed.
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