Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsh23c..01a&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SH23C-01
Physics
2102 Corotating Streams, 2169 Sources Of The Solar Wind, 7509 Corona, 7511 Coronal Holes, 7524 Magnetic Fields
Scientific paper
The potential field source surface model (PFSS) was developed independently by Schatten et al. [1969] and Altschuler et al. [1969]. The model is magnetostatic in nature and makes two major simplifying assumptions about the large-scale corona: 1) there is zero current in the coronal region between the photosphere and an imaginary spherical surface (i.e., the source surface) positioned typically between 2-3 Rs from Sun center and 2) the field is radial at the source surface. The latter assumption is essentially an attempt to account for the fact that the solar magnetic field is frozen into the coronal plasma and is being dragged along as it flows radially out into the heliosphere. While both assumptions are clearly gross over-simplifications of the true state of the corona, the PFSS model nonetheless works well at describing the large-scale, quasi-steady state of the corona field. In fact, the model has been shown [Wang et al. 1992, 1996, and 2001] to reproduce reasonably well, over multiple solar cycles, the observed coronal hole patterns, and for 3-month running averages, the interplanetary magnetic field (IMF) strength and solar wind speed at L1. In addition, the PFSS model and the more advanced MHD coronal models have been shown [Neugebauer et al., 1998] to reproduce equally well the size, shape, and positions of observed coronal holes and the observed heliospheric field sector structure. Work by Arge et al. [2000, 2002, and 2004] demonstrates that the model can successfully predict, on time-scales of less than a day, the ambient solar wind speed and IMF polarity 3-5 days in advance. In this talk, we provide a brief overview of the PFSS model and how its predictions compare with observations. I then describe our efforts to use it to predict the ambient solar wind.
Arge Charles Nickolos
de Toma Giuliana
Odstrcil Dusan
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