Susino, R. and Bemporad, A. and Heinzel, P. and Jejčič, S. and Anzer, U. and Dzifčáková, E. (2019) Determination of the physical properties of an erupting prominence from SOHO/LASCO and UVCS observations. Il nuovo cimento C, 42 (1). pp. 1-3. ISSN 1826-9885
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Abstract
We studied the physical conditions of an erupting prominence observed in the core of a coronal mass ejection, using combination of SOHO/LASCOC2 visible-light images and SOHO/UVCS ultraviolet data. Measured intensities and profiles of the neutral-hydrogen Lyman-α and Lyman-β lines and the 977 ˚ACiii line were used together with the visible-light brightness to derive the geometrical and physical parameters of the prominence, such as the line-of-sight apparent thickness, electron column density, kinetic temperature, and microturbolent velocity. These parameters were used to constrain a non-LTE (i.e., out of local thermodynamic equilibrium) radiative-transfer model of the prominence that provides the effective thickness, electron density, and flow velocity, in a sample of points selected along the prominence. The prominence can be described as a hot structure with low electron density and very low gas pressure compared to typical quiescent prominences. Intensities of the hydrogen lines were also used for a detailed determination of the plasma line-of-sight filling factor, in the two prominence points where simultaneous and cospatial LASCO-C2 and UVCS observations were available.
| Item Type: | Article |
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| Subjects: | 500 Scienze naturali e Matematica > 530 Fisica |
| Depositing User: | Marina Spanti |
| Date Deposited: | 27 Nov 2020 14:18 |
| Last Modified: | 27 Nov 2020 14:18 |
| URI: | http://eprints.bice.rm.cnr.it/id/eprint/20404 |
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