Coronal Pseudostreamers and Like-Polarity Solar Wind Stream Boundaries: Contributions Over the Past Three Solar Cycles

Details Coronal Pseudostreamers and Like-Polarity Solar Wind Stream Boundaries: Contributions Over the Past Three Solar Cycles Coronal Pseudostreamers and Like-Polarity Solar Wind Stream Boundaries: Contributions Over the Past Three Solar Cycles

May 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21640707l&link_type=abstract

American Astronomical Society, AAS Meeting #216, #407.07; Bulletin of the American Astronomical Society, Vol. 41, p.860

Astronomy and Astrophysics

Astronomy

Scientific paper

Potential Field Source Surface models are used to investigate the variable extent to which coronal pseudostreamer boundaries and their associated solar wind streams map into the ecliptic over the course of the last three solar cycles. These features, whose coronagraph signatures were described by Wang et al. (2007) map into stream interaction regions (SIRs) between like-interplanetary field polarity solar wind streams. Neugebauer et al. (2004) found these SIRs to have properties similar to those of SIRs associated with interplanetary field sector boundary crossings, with the exception of the absence of the heliospheric current sheet(HCS)encounter(s). One difference is that SIRs of like-polarity streams are not limited to HCS crossings and can occur in any numbers dictated by the coronal field configuration. We use the PFSS model based on MWO data to estimate how many like-polarity stream boundaries occur in the ecliptic per Carrington Rotation as a function of solar activity since 1975. We find that the current cycle minimum solar wind must have significant contributions from these SIRs, consistent with the ubiquity of pseudostreamers throughout the minimum.

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