Physical Parameters in Streamer From CDS and UVCS Observations

Details Physical Parameters in Streamer From CDS and UVCS Observations Physical Parameters in Streamer From CDS and UVCS Observations

Oct 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.446..531p&link_type=abstract

8th SOHO Workshop: Plasma Dynamics and Diagnostics in the Solar Transition Region and Corona. Proceedings of the Conference hel

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Scientific paper

UVCS and CDS observations of a streamer in the southern hemisphere, at a latitude of 40 Degrees, have been acquired on March 8, 1998. UVCS data have been taken at an heliocentric altitude of 1.6 solar radii and cover the spectral range from 950 to 1250 Angstrom; CDS data have been taken at an altitude of 1.1 solar radii and cover the range from 308 to 381, and 513 to 633, Angstrom. These data have been used to determine the physical conditions of a streamer structure: in particular, we give an estimate of the electron temperature, electron density and element abundance in the structure. The electron temperature has been evaluated from lines of different ions from the same elements, crude values of densities have been derived from an analysis of the OVI doublet lines at 1032 and 1037 Angstrom and element abundances have been estimated both from a DEM (Differential Emission Measure) analysis and from other techniques. Because UVCS spectra have been taken at different times, during the day, we have been looking also at temporal variations in the physical parameters of the streamer. Changes across the streamer have been analyzed as well. Coordinated CDS and UVCS observations allow us also to compare results from the two experiments and look for variations, with solar distance, of the streamer physical parameters.

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