AAS Meeting #194 - Chicago, Illinois, May/June 1999
Session 59. Active Region Formation and Evolution
Solar, Oral, Tuesday, June 1, 1999, 2:30-4:00pm, Continental Ballroom C

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[59.05] A Transition Region Eruption Observed with CDS, TRACE and EIT

P. Brekke (ESA), O. Kjeldseth-Moe, T. Fredvik, S.V.H. Haugan (ITA), T.D. Tarbell (LMSAL), J.B. Gurman (NASA/GSFC)

An ejection of plasma on the west limb has been observed with CDS, TRACE and EIT on 19 May 1998. The start of the eruption coincided with a weak flare observed with GOES. Erupting material rose to 120 Mm above the solar surface in 17 min, and then fell back to the solar surface. Vertical velocities of 200 km s-1 are estimated from a series of TRACE images in the C+3 resonance lines at 155 nm and from EIT images in the 19.5 nm band, while Doppler shifts of the transition region lines observed with CDS yield maximum horizontal velocities of 300 km s-1 at the top of the plasma trajectories. The similar appearance and time variation of the eruption as seen with all three instruments indicate the presence of a multi-temperature plasma in spatial regions less than 1-2 arc seconds, with temperatures ranging from 105K to 1.5 MK. The material did not have the momentum to break loose from the Sun and was not associated with any CME observed with LASCO. However, we may speculate that CMEs are similar to the eruption observed, with even higher speeds involved.

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