Spectral analysis of four quiescent prominences observed at the Peruvian eclipse |
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| Authors: | Tadashi Hirayama |
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| Institution: | 1. Institute for Astronomy, University of Hawaii, Hawaii, USA
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| Abstract: | Two-dimensional distributions of kinetic temperature, density and turbulent velocity are obtained for four quiescent prominences observed at the Peruvian eclipse of 12 November, 1966. - The kinetic temperature derived from line widths is around 6000–7000 K in the central part of prominences and rises to 12000K in both edges and possibly in the top of prominences.
- The turbulent velocity shows a similar tendency, being 7–9 km/sec in the central part and ≈ 20 km/sec in the outer part. The turbulent velocity also increases slowly towards higher heights in the prominence.
- The electron density derived both from the Stark effect and the intensity ratio of the continuous spectra turns out to be about 1010.2–1010.6 cm?3 in the central portion of two prominences.
- From the width and the intensity, neutral helium lines are shown to originate in the same region as hydrogen and metallic lines where the kinetic temperature goes down to 6000 K. This indicates that neutral helium is emitted after the ionization due to UV radiation from the corona and the transition region.
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