Mass motions associated with H-alpha active region arch structures

Details Mass motions associated with H-alpha active region arch structures Mass motions associated with H-alpha active region arch structures

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990soph..129..277g&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 129, Oct. 1990, p. 277-293.

Physics

18

Coronal Loops, H Alpha Line, Solar Activity, Solar Prominences, Faculae, Free Fall, Solar Magnetic Field, Solar Spectra

Scientific paper

A study has been made of mass motions associated with active region arch structures from observations of a developing active region near the center of the solar disk. A method is presented for the computation of the line-of-sight velocity from photographs at H-alpha + or - 0.5 under the assumption of Beckers' cloud model and reasonable assumptions about the Doppler width and optical depth of the arches. Some arches show motions typical to arch filaments, while in others the velocity field is more complex. Assuming a symmetric loop, the velocity vector was reconstructed along an arch filament. The results are consistent with the picture where material is draining out of the filament while the whole structure is ascending with a velocity near that of the apex, which does not exceed 10 km/s. The motion is systematically slower than expected from a free-fall model.

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