Charge-State and Plasma Properties Across Trailing Boundaries of Slow Solar Wind

Details Charge-State and Plasma Properties Across Trailing Boundaries of Slow Solar Wind Charge-State and Plasma Properties Across Trailing Boundaries of Slow Solar Wind

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsh32a..03c&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SH32A-03

Astronomy and Astrophysics

Astrophysics

[2102] Interplanetary Physics / Corotating Streams, [2164] Interplanetary Physics / Solar Wind Plasma, [2169] Interplanetary Physics / Solar Wind Sources, [7524] Solar Physics, Astrophysics, And Astronomy / Magnetic Fields

Scientific paper

During the declining phase of the recent solar cycle, from December 2002 to February 2004, the configuration of the solar magnetic field produced a stable, two-sector pattern in the solar wind. Unexpectedly, however, the stream structure was irregular. An automated search for trailing boundaries of intervals of slow wind, that is, stream interfaces in stream interaction regions, yielded a quasi-alternating pattern of slow wind with and without sector boundaries. We associate the latter with pseudostreamers, which are double helmet structures separating open fields of the same polarity. Some of these structures are clearly evident in potential field source surface reconstructions. Superposed epoch analysis reveals less pronounced changes in plasma properties across the boundaries of slow wind associated with pseudostreamers, consistent with earlier findings from case studies. Throughout the period investigated, the oxygen charge state ratio is remarkably well-correlated with an entropy parameter calculated from proton temperature and density, and, like entropy, varies predictably across the slow wind boundaries. There is no evidence of any separation between charge-state and wind-speed boundaries, as has recently been proposed.

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