Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....87..183d&link_type=abstract
Astronomy and Astrophysics, vol. 87, no. 1-2, July 1980, p. 183-187. Research supported by the Department of Education of North
Astronomy and Astrophysics
Astrophysics
15
Atomic Theory, Carbon Isotopes, Collision Rates, Oxygen Isotopes, Solar Corona, Solar Spectra, Electron Density (Concentration), Electron Energy, Electron Pressure, Electron Transitions, Emission Spectra, Line Spectra
Scientific paper
Recent theoretical atomic data for the collisional and radiative rates is used in a reinterpretation of the observed C V and O VII emission line ratios in the solar corona/transition region. In the calculations, transitions between the five lowest states of the He-like ion are considered. From C V an electron density of 4.5 x 10 to the 9th power per cu cm, and an electron temperature of 3.0 x 10 to the 5th power K are derived, while in the region of O VII emission lines, an upper limit of 2.0 x 10 to the 9th power per cu cm is found for the electron density, and an upper limit of 1.6 x 10 to the 15th power per cu cm K is derived for the electron pressure.
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