Computer Science – Sound
Scientific paper
May 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999aas...194.9310j&link_type=abstract
American Astronomical Society, 194th AAS Meeting, #93.10; Bulletin of the American Astronomical Society, Vol. 31, p.990
Computer Science
Sound
Scientific paper
Both Skylab and SOHO observations show that the total intensity in the He II 304 Angstroms line exceeds that predicted by standard NLTE models by at least a factor of 5. However, the NLTE models do not include the effect of flows. Carole Jordan showed that a 'velocity redistribution' of the He II ions in the presence of a sharp temperature gradient could provide the required enhancement. In earlier studies, we have reported evidence from the Goddard SERTS sounding rocket for small-scale nonthermal velocities large enough to enhance the emission by the required amount if the temperature gradient is large enough (as given by current transition region models). Here, we assess the correlation of regions of strong Sun-center quiet-Sun 304 emission observed with the CDS instrument on SOHO and the dark coarse mottles observed in the red wing of H-alpha observed at the Coimbra Solar Observatory. The significant positive correlation supports the picture of greater velocity mixing in the quiet-Sun regions producing the highest line intensity. Support for this research is provided by NASA grant 682-344-17-38 and the Coimbra Solar Observatory.
Andretta Vincenzo
Behring William E.
Brosius Jeffrey W.
Garcia Arnaldo
Jordan Stuart D.
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