High-Resolution Multi-Spectral Observations of Solar Coronal Open Structures: Polar and Equatorial Plumes and Rays.

Details High-Resolution Multi-Spectral Observations of Solar Coronal Open Structures: Polar and Equatorial Plumes and Rays. High-Resolution Multi-Spectral Observations of Solar Coronal Open Structures: Polar and Equatorial Plumes and Rays.

Jan 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phdt........10d&link_type=abstract

Thesis (PH.D.)--STANFORD UNIVERSITY, 1995.Source: Dissertation Abstracts International, Volume: 56-10, Section: B, page: 5547.

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Scientific paper

XUV emissions from the lower corona (R ~1.5 R odot) have been observed by the Multi-Spectral Solar Telescope Array (MSSTA), a cluster of normal-incidence XUV telescopes that flew in 1991 and 1994, and by the MSSTA's predecessor, the Stanford/MSFC/LLNL Rocket Spectroheliograph, in 1987. In 1987 and 1994, observations of the Sun at 173 A and comparison with concurrent magnetogram images, show narrow ( ~10 arc sec), radially expanding polar plumes with unipolar footpoints in the polar coronal holes. The 1991 observation, taken near solar maximum, does not show these features over the poles of the Sun, though plume -like footpoints are observed. The 1991 observation does show another class of plume, "Equatorial plumes", that have narrow (~10 arc sec) footpoints which appear to be unipolar, and that expand super-radially with a solid angle expansion factor of ~25 at R = 2 R odot. In this dissertation, I provide a brief overview of some previous observations and of our instruments (Chap. I), describe the MSSTA instruments' theoretical response to the coronal plasma (Chap. II), and present quantitative results of these observations (Chaps. III and IV). A brace of appendices describe some details of the MSSTA film calibration, and illustrate the filter design process that was used for the 1994 flight.

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