Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004iaus..219..688l&link_type=abstract
Stars as suns : activity, evolution and planets, Proceedings of the 219th symposium of the International Astronomical Union held
Astronomy and Astrophysics
Astronomy
Scientific paper
Unusual line broadenings were observed in solar prominences by the Multi-channel Infrared Solar Spectrograph (MISS) at Purple Mountain Observatory China and Solar Coronagraph at Norikura Solar Observatory Japan. Line profiles including H-alpha CaII 8542 HeI 10830 and D3 were analyzed. All the prominences presented here show more or less broadened line profiles with full-width at half maximum (FWHM) in the range of 1.6 Angstrom -2.5 Angstrom which last for about 20--40 minutes. The spatial size of the prominence showing line broadening is about 6--8 arc sec. In addition line shift may simultaneously exist with line broadening. The results show that the unusual line broadenings are sometimes temporally consistent with soft X-ray increase observed by GOES. This indicates that there may exist high energy process in solar prominences. The broadening are frequently associated with active regions instead of solar flares. However the unusual broadening may be followed by surge-like structures or sprays. Meanwhile the tilted spectrograms observed imply that solar prominence rotates in its rising process and show the thread structure of prominence clearly.
Li Handong
You Jiangong
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