The Relation Between the Solar Wind Velocity and the Magnetic Conditions of Coronal Holes

Details The Relation Between the Solar Wind Velocity and the Magnetic Conditions of Coronal Holes The Relation Between the Solar Wind Velocity and the Magnetic Conditions of Coronal Holes

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsh21b0164h&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SH21B-0164

Physics

1

2164 Solar Wind Plasma, 2169 Sources Of The Solar Wind, 7509 Corona, 7511 Coronal Holes, 7524 Magnetic Fields

Scientific paper

It is thought that interplanetary space is filled by solar wind, which originates from coronal holes of various sizes and that the structure of each coronal hole is approximately uniform. Using this idea, we have performed a correlation study between solar wind velocity originating from coronal holes and photospheric/coronal magnetic fields from coronal holes. Interplanetary scintillation (IPS) observations allow us to estimate the global velocity structure in the solar wind for each Carrington rotation. We applied a tomographic analysis using IPS data to obtain 2-dimentional velocity distributions at 2.5 solar radii and then determined the average solar wind velocity, u, originating from each coronal hole. Coronal holes are identified using FeI and HeI observation from the NSO/Kitt Peak and the average magnetic field strength, B, of each coronal hole is calculated. Coronal magnetic fields above the coronal hole are computed using a potential-field source-surface model and the flux tube expansion rate, f, is calculated for each coronal hole. We have calculated the correlation coefficient between u and a combination of B and f (i.e. Bm/f\(n\)) for 41 coronal holes. As a result, we have found that the value B/f shows a higher correlation with u than the value B (deduced by Fisk et. al. model, 1999) and the value f (deduced by Wang and Sheeley model, 1991). We propose that the parameter, B/f, is an important indicator of the solar wind velocity originating from various kinds of coronal holes.

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