AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 101. Coronal Mass Ejections
Oral, Thursday, June 3, 1999, 2:00-3:30pm, Continental Ballroom B

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[101.06] Disk Center Eruptive Filament Line Profile Observations

MJ Penn (Cal State Univ Northridge)

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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