Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...529..575c&link_type=abstract
The Astrophysical Journal, Volume 529, Issue 1, pp. 575-591.
Astronomy and Astrophysics
Astronomy
52
Sun: Corona, Sun: Prominences, Sun: Uv Radiation
Scientific paper
The EUV Imaging Telescope (EIT), Large Angle Spectrometric Coronagraph (LASCO), and Ultraviolet Coronagraph Spectrometer (UVCS) instruments aboard the SOHO satellite observed a prominence eruption (coronal mass ejection) on 1997 December 12. Ejected plasma moved at about 130 km s-1 in the plane of the sky and showed Doppler shifts between -350 and +30 km s-1. The eruption appeared as a strongly curved arch in EIT images low in the corona. Emission in ions ranging from Si III to O VI in the UVCS spectra indicates a temperature range between 104.5 and 105.5 K. The morphology of the bright emission regions seen by all three instruments suggests several strands of a helical structure of moderate pitch angle. A reasonable fit to the spatial structure and the velocity evolution measured by UVCS is provided by a left-handed helix untwisting at a rate of about 9x10-4 radians s-1.
Antonucci Ester
Ciaravella Angela
Gardner Leroy
Kohl John
Li Jiying
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