Where in the Streamer Belt does the Slow Speed Wind Originate?

Details Where in the Streamer Belt does the Slow Speed Wind Originate? Where in the Streamer Belt does the Slow Speed Wind Originate?

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh41b07s&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH41B-07

Astronomy and Astrophysics

Astrophysics

2169 Sources Of The Solar Wind, 7509 Corona, 7549 Ultraviolet Emissions

Scientific paper

The Ulysses high latitude mission showed that the slow speed wind at solar minimum appears to come from equatorial regions in the heliosphere that are dominated by helmet streamers. However, there are few coronal measurements of the detailed latitudinal variation of the outflow velocity across a streamer. Such measurements are needed to identify the region of the streamer that gives rise to the slow speed wind. For this study we use UVCS and LASCO observations of a solar minimum streamer to make a detailed model of the outflow velocities for O+5 as a function of position angle from the streamer axis. This new work goes beyond using the OVI line ratios to define the boundaries between fast and slow wind. We constrain the coronal plasma parameters (velocities, temperature anisotropies, densities, etc.) using OVI and Ly-alpha line profiles, and white light polarized brightness data. We will discuss various possibilities for the latitudinal profile for the coronal outflow in the streamer belt. This work is supported by NASA Grant NAG5-7822 to the Smithsonian Astrophysical Observatory, by the Italian Space Agency, and by the ESA PRODEX program (Swiss contribution).

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