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- W3103490561 abstract "Since the Lalpha rocket observations of (Gabriel, Solar Phys. 21, 392, 1971), it has been realized that the hydrogen (H) lines could be observed in the corona and offer an interesting diagnostic for the temperature, density, and radial velocity of the coronal plasma. Moreover, various space missions have been proposed to measure the coronal magnetic and velocity fields through polarimetry in H lines. A necessary condition for such measurements is to benefit from a sufficient signal-to-noise ratio. The aim of this article is to evaluate the emission in three representative lines of H for three different coronal structures. The computations have been performed with a full non-local thermodynamic equilibrium (non-LTE) code and its simplified version without radiative transfer. Since all collisionnal and radiative quantities (including incident ionizing and exciting radiation) are taken into account, the ionization is treated exactly. Profiles are presented at two heights (1.05 and 1.9 solar radii, from Sun center) in the corona, and the integrated intensities are computed at heights up to five solar radii.We compare our results with previous computations and observations (e.g. Lalpha from UVCS) and find a rough (model-dependent) agreement. Since the Halpha line is a possible candidate for ground-based polarimetry, we show that in order to detect its emission in various coronal structures, it is necessary to use a very narrow (less than 2 A wide) bandpass filter." @default.
- W3103490561 created "2020-11-23" @default.
- W3103490561 creator A5055039930 @default.
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- W3103490561 date "2016-10-26" @default.
- W3103490561 modified "2023-10-18" @default.
- W3103490561 title "Neutral Hydrogen and Its Emission Lines in the Solar Corona" @default.
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- W3103490561 doi "https://doi.org/10.1007/s11207-016-0995-x" @default.
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