Physics
Scientific paper
Dec 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999esasp.448.1101s&link_type=abstract
Magnetic Fields and Solar Processes. The 9th European Meeting on Solar Physics, held 12-18 September, 1999, in Florence, Italy.
Physics
4
Scientific paper
Flow tubes adjacent to closed magnetic field lines on the boundaries of streamers can have extremely large geometric spreading factors. Numerical models in this thin layer are subject to grid definition uncertainties. Therefore, we compute flow tube geometry using the analytic model of streamer structure described by Pneuman (1968). This model has been found to be more widely applicable than commonly believed as a consequence of observations made with SOHO/UVCS and YOKHOH/SXT (Li et al., 1998). We use the model to compute the radial dependence of flow tube geometry (the ``spreading factors'') for several different streamer models. The results are used to analyze the hypothesis that extremely slow flows in these open flow tubes may cause high densities relative to adjacent coronal hole flow. Such high density could mean that the streamer brightness boundary is defined by the open flow tubes adjacent to streamers rather than closed field lines.
Nerney Steven
Suess Steve T.
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