Other
Scientific paper
Oct 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..461m&link_type=abstract
8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel
Other
3
Scientific paper
The dynamic behaviour of the resonance lines of He I and He II in the quiet solar transition region is examined. Previous observations have suggested that the intensities of these lines are anomalously strong in the quiet solar transition region compared with other transition region lines formed at the same temperature. These results have now been confirmed using the latest data from the SOHO CDS and SUMER spectrometers (Macpherson &Jordan 1997, 1999). One of the interesting results from SOHO concerns the variations with time of transition region lines in the supergranulation network (Harrison 1997). He found that the O IV line at 554-A varied by factors of 2-3 over a few minutes, while the He I line at 537-A and the Mg IX line at 368-A varied far less. New observations using high-rate telemetry have been made using CDS, including the lines of He I, He II and of other transition region and coronal lines. The observations give several hours of repeated 25-s exposures of the quiet Sun to allow studies of the dynamical properties of the He I and He II lines in comparison with the other lines observed. These complement our previous studies of the spatial variation of the He I and He II lines and are an important part of understanding the helium line formation. We report the results of analyses of these data.
Jordan Cathy
MacPherson K. P.
Smith Gordon
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