Abstract
A Multi-Channel Subtractive Double Pass spectrograph (MSDP) has been achieved at the Meudon solar tower. Line profiles are obtained simultaneously in a two dimensional field. Space and time resolutions are very suitable for observation of fast chromospheric phenomena.
Maps have been computed for Doppler shifts and Hα-intensities (core and wings) in a plage including a temporary activated filament. The radial velocity is zero in the core of the filament, but it increases toward the edges with opposite signs on the both sides. Velocity loops inclined at small angles on the axis of the filament are suggested.
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References
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Mein, P. Multi-Channel Subtractive spectrograph and filament observations. Sol Phys 54, 45–51 (1977). https://doi.org/10.1007/BF00146423
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DOI: https://doi.org/10.1007/BF00146423