Astronomy and Astrophysics – Astronomy
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.5905b&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #59.05; Bulletin of the American Astronomical Society, Vol. 31, p.918
Astronomy and Astrophysics
Astronomy
Scientific paper
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 10(5) K 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.
Brekke Paal
Fredvik T.
Gurman Joe B.
Haugan S. V. H.
Kjeldseth-Moe Olav
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