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Session 37 - First Results from the Solar and Heliospheric Observatory (SOHO).
Display session, Tuesday, June 11
Tripp Commons,
The Coronal Diagnostic Spectrometer, CDS, on SOHO has observed its first strong High Velocity Event. The event occurred on 22 March 1996 at approximately 13.36 UT and was located in the leg of an active region loop. The spectral signature is extremely wide emission lines corresponding to a velocity dispersion of approximately 300-450 km/s. As measured in the 386 A line from Mg IX, the emission also seems shifted in wavelength with a redshift corresponding to 65 km/s. The intensity contrast in the line is a factor 2 compared to the surrounding areas. The spatial extent is small, less than or corre- sponding to the angular resolution of CDS of 4". The event occur in all available lines from He I to Fe XV, i.e. over a temperature range from 10 000 K to 2.2 MK. This is a new result which has not been reported before. The relation of this type of event to the well studied explosive events is discussed.
