Physics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........89s&link_type=abstract
Thesis (PH.D.)--HARVARD UNIVERSITY, 1990.Source: Dissertation Abstracts International, Volume: 51-07, Section: B, page: 3421.
Physics
2
Scientific paper
Doppler dimming is evaluated as a method for determining coronal outflow velocities from intensity measurements of resonantly scattered OVI lambda lambda1031.9 and 1037.6A. To perform such measurements, an EUV detector subsystem was developed and characterized. The primary elements of the detector subsystem are two high-gain, high-current channel electron multiplier detectors which were optimized for the OVI spectral lines. The detector is part of a UV Coronal Spectrometer (UVCS) which is expected to be deployed by the Space Shuttle on a retrievable Spartan carrier in late 1991. One of the goals of the Spartan mission is to obtain velocity determinations within the acceleration region of the corona. HI Ly-alpha observations from a 1982 rocket flight were analyzed in order to gain insight into the possibility of measuring coronal outflow velocities with the Doppler dimming method. That analysis indicates outflow velocities of 217 km s^ {-1} at 2 R_&sun; (from sun-center) in a polar coronal hole. Measurement and model uncertainties of the rocket observations result in an uncertainty range of 153 to 251 km s^ {-1} at a confidence level of 67%. The reported measurement can best be characterized as strong evidence of supersonic outflow within 2 R_ &sun; of sun-center in a coronal hole. The Spartan/UVCS is expected to decrease significantly the uncertainty range.
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