Predicting Solar Wind Structures in the Inner Heliosphere

Details Predicting Solar Wind Structures in the Inner Heliosphere Predicting Solar Wind Structures in the Inner Heliosphere

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh21b..02m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SH21B-02

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2134 Interplanetary Magnetic Fields, 2164 Solar Wind Plasma, 2169 Solar Wind Sources, 7509 Corona, 7959 Models

Scientific paper

The ENLIL solar wind transport model solves the three-dimensional ideal MHD equations for the inner and mid heliosphere (~0.1- 5AU) using an explicit finite difference scheme. The inner boundary of the model is normally positioned in the super critical flow region, which greatly simplifies the numerics of the boundary conditions there, and it requires the MHD variables as a function of time. These can be provided by a 3D MHD coronal code such as SAIC's MAS (e.g., Odstrcil et al. 2004) model or inferred from the Wang-Sheeley-Arge (WSA) model output. WSA is a quick running, computationally inexpensive model that, using synoptic maps derived from the line-of-sight photospheric magnetic field as its input, makes use of the coupled Potential Field Source Surface (PFSS) and the Schatten Current Sheet (SCS) models to derive the magnetic topology of the corona. The solar wind speed distribution on the outer boundary of the coronal code is determined empirically and then propagated to 1 AU using a 1D kinematic code (WSA) or using a propagation code such as ENLIL (WSA- ENLIL). At the WSA-ENLIL interface the magnetic field and velocity on the outer boundary of WSA are used (in addition to the assumption of pressure balance and mass or momentum flux conservation) to define the remaining necessary MHD parameters. The empirically defined velocities at 21.5 Rsolar are calculated to best match L1 observations using the ballistic propagation method of WSA, not ENLIL. Here we calibrate the WSA-ENLIL interface using L1 observations, and extend our comparisons to higher latitude observations made by Ulysses during its fast latitude scans.

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