Other
Scientific paper
Jan 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999stin...9909149j&link_type=abstract
Technical Report, NASA Goddard Space Flight Center Greenbelt, MD United States
Other
Transition Region And Coronal Explorer, Solar Transition Region, Solar Corona, Solar Atmosphere, Soho Mission, Resonance Lines, Line Spectra, Velocity Distribution
Scientific paper
Previous work by this group has demonstrated that small-scale nonthermal velocities probably play a significant role in enhancing the intensity of the He II 304 A line above values predicted by the static atmosphere NLTE theories, and more in conformity with Skylab and SOHO observations. This presentation briefly summarizes the evidence for this conclusion, emphasizing SOHO and correlated groundbased observations, of which examples are presented. However, in contrast to the previous studies, the tact taken here is more critical, asking the question "Can velocity redistribution fully explain the observations of the 304 A line, and what counter-indications and problems remain?" The conclusion reached is that, while velocity redistribution plays a significant role in the intensity enhancement, it may not be the whole story. Some other mechanism, associated with velocity filtration, may be at work.
Andretta Vincenzo
Behring William
Brosius Jeffrey
Garcia Adriana
Jordan Stuart
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