Coronal hole boundaries from the Sun to the Heliosphere: Constraints on the sources and structure of the solar wind

Details Coronal hole boundaries from the Sun to the Heliosphere: Constraints on the sources and structure of the solar wind Coronal hole boundaries from the Sun to the Heliosphere: Constraints on the sources and structure of the solar wind

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agusm..sh21b06z&link_type=abstract

American Geophysical Union, Spring Meeting 2001, abstract #SH21B-06

Physics

2102 Corotating Streams, 2169 Sources Of The Solar Wind, 7511 Coronal Holes

Scientific paper

Coronal holes are known to be a source of fast, relatively homogenous solar wind. A more variable slow solar wind emerges from the corona adjacent to these fast streams and dominates the low latitude heliosphere. The relation between these two qualitatively different solar wind types is best studied by investigating in detail the structure and evolution of the coronal hole boundaries from the low atmosphere of the Sun, through the corona and into the deep heliosphere. We present a comprehensive data-study combining data from He I 10830A, EIT, UVCS and in situ plasma and composition measurements from SWICS on Ulysses and ACE. First, the location and structure of the coronal hole boundary is determined in each of the remote data-sets. We then project the in situ plasma and composition measurements to 30 Rs using a sophisticated 2D MHD tracing technique. This technique then allows a direct comparison of solar and in situ coronal hole boundaries. We particularly concentrate on UVCS and SWICS data of heavy ions in the solar wind that allow the most rigorous comparisons of solar and in situ data, using the same measurement in the corona as in the solar wind. We will then discuss these data in the context of models and theories of the structure of the three-dimensional structure of the corona and the solar wind. We will also compare the observations with an 3D MHD calculation that predicts super-radial expansion of the fast solar wind associated with coronal holes. This paper is a report of an ISSI International Team on coronal hole boundaries.

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