Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...19410106p&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #101.06; Bulletin of the American Astronomical Society, Vol. 31, p.999
Astronomy and Astrophysics
Astronomy
Scientific paper
From 15:33-15:54 UT on 13 June 1998 observations of an erupting filament at disk center were obtained with the NSO/KPVT, SoHO/CDS, and TRACE instruments as part of the SoHO Joint Observing Program 70. The NSO/KPVT imaging spectroscopy data scanned 512x512 arcsec of the solar surface at disk center and were spectrally centered at the He I 1083 nm line and captured +/- 1.0 nm of surrounding solar spectrum. The He I absorption line is seen blue-shifted to velocities of between 200 and 300 km/sec. The true solar trajectory of the eruption is obtained by using the projected solar N/S and E/W coordinates and by integrating the Doppler velocity. The filament travels along a path inclined roughly 45 degrees to the solar surface to a height of about 1.5 solar radii before it becomes too diffuse to follow. The filament also shows internal motions (untwisting?) with multiple Doppler components shifted by +/- 25 km/sec. The SoHO/CDS data scanned the region in seven EUV lines; results from these data will also be presented. Finally, the TRACE data shows the morphology of the eruption in the EUV lines of Fe IX and Fe XII. Evolution of the hot coronal plasma is evident, and evolving dark regions seem to show the cool plasma transverse motions. The NSO/KPVT data presented are produced cooperatively by NSF/NOAO, NASA/GSFC and NOAA/SEL. This work is is part of a 1997 and a 1999 SoHO Guest Investigator award.
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