Solar Cycle Changes of Coronal Streamer Properties

Details Solar Cycle Changes of Coronal Streamer Properties Solar Cycle Changes of Coronal Streamer Properties

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh21b0154s&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH21B-0154

Astronomy and Astrophysics

Astrophysics

7509 Corona, 7536 Solar Activity Cycle (2162), 7549 Ultraviolet Emissions

Scientific paper

We have measured UV spectroscopic parameters, as a function of height for more than 30 coronal streamers in order to identify similarities between streamers at different phases of the solar cycle. For the period from 1996-2002, we provide line intensities, line widths, and line ratios for the O VI 1032/1037 doublet and intensities and line widths for the H I Ly-alpha line for these streamers. From such measurements we can derive plasma parameters (densities, temperatures, and outflow velocities) for O5+ and protons as a function of heliocentric height (1.5 > r/Ro > 5) in the streamers. This information is useful for setting empirical constraints on coronal heating and solar wind acceleration in streamers. This work is supported by NASA Grant NAG5-12781 to the Smithsonian Astrophysical Observatory and NASA subcontract OGSP21010200061SAO awarded to SAO through a grant to Southern Universty at Baton Rouge.

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