An eruption in the transition region observed with CDS and TRACE, on May 19, 1998.
Abstract
The authors present simultaneous CDS and TRACE observations in the EUV of an eruption of May 19, 1998. A large ejection of plasma was seen on the west limb and could be followed in EUV rasters in transition region lines with CDS and in high cadence images in the C+3 155 nm line from TRACE. The onset of the eruption coincided with a weak flare observed with GOES. The eruption extended to 120000 km above the solar surface after 17 min and then fell back to the solar surface. At the leading edge of the eruption CDS observed Doppler shifts of 300 km s-1 away from the observer (i.e. parallel to the solar surface) in the O+4 line at 62.9 nm. High cadence observations with TRACE indicate that the plasma velocities perpendicular to the line of sight (i.e. along the solar vertical) reached similar values, i.e. 200 km s-1. Perhaps this was a "coronal mass ejection" that did not make it?
- Publication:
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JOSO Annu. Rep., 1998
- Pub Date:
- 1999
- Bibcode:
- 1999joso.proc..170B
- Keywords:
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- Solar Transition Region: Eruptions;
- Solar Corona: Mass Ejection