Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...259..649g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 259, no. 2, p. 649-662.
Astronomy and Astrophysics
Astrophysics
18
Coronal Loops, H Alpha Line, Line Shape, Solar Corona, Solar Flares, Ribbons, Solar Observatories, Spectrographs
Scientific paper
Observations of a two ribbon flare on 5 May, 1989 were performed at Yunnan Observatory and at Meudon. Magnetograms have been obtained in Huairou-Beijing Observatory. The topology of the flaring region and the slow evolution of post-flare loops (cool flare loops) can be derived from Yunnan filtergrams. The ribbons seem to be the footpoints of the loops. The analysis of H-alpha line profiles in the loops, obtained with the Multichannel Subtractive Double Pass (MSDP) spectrograph of Meudon allows us to derive some physical parameters of the loops. The importance of the reference background intensity is discussed. The cool flare loops are low (hmax is approximately equal to 25,000 km) dense (ne is approximately equal to 10 exp 11/cu cm) and relatively inhomogeneous. They are rising with a velocity of 5 to 10 km/s.
Gu Xiao-Ma
Lin Jun
Luan T.
Schmieder Brigitte
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