Physics
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999soph..185..113p&link_type=abstract
Solar Physics, v. 185, Issue 1, p. 113-125 (1999).
Physics
9
Scientific paper
Previous studies have shown that the measured velocity field in solar prominences exhibits a slightly different behaviour depending on the observational conditions, on the investigation method, and possibly on the type of prominence. Observations of prominences seen at the limb reveal strong downward motions, whereas upflows are detected as Doppler shifts in filaments on the disk. In order to shed new light on this point, we have investigated the mass motions in a solar prominence by using a new method for calculating the geometric distortion between subsequent images. Flows perpendicular to the line of sight have been determined in several layers of the prominence-corona atmosphere, using extreme ultraviolet (EUV) lines formed at different temperature levels (T=104-106K). We show that the motions mainly have a vertical direction, oriented both upwards and downwards. The velocity pattern can change rapidly during time intervals exceeding 10-15min. We also find that the measured velocity field shows a similar pattern in all the studied lines.
Molowny-Horas Roberto
Pojoga Sorin
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